JP2014169908A - Monitoring system, monitoring slave device, monitoring master device, monitoring method and monitoring program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a monitoring system, a monitoring slave device, a monitoring master device, a monitoring method and a monitoring program that identify at which location a monitor object exists in a monitor object area.SOLUTION: A transmission area of a radio signal to be transmitted by monitoring slave devices 102a, 102b, 102c and 102d includes an installation location of a monitoring master device 101, and is different from each other among the monitoring slave devices 102a, 102b, 102c and 102d. The monitoring master device 101 receives the radio signal transmitted respectively from the monitoring slave devices 102a, 102b, 102c and 102d, calculates an amount of a spatial characteristic for each radio signal on the basis of each of received radio signals, and monitors a behaviour of a human being in the transmission area corresponding to the radio signal on the basis of the calculated amount of the spatial characteristic.

Description

  The present invention relates to a monitoring system, a monitoring slave unit, a monitoring master unit, a monitoring method, and a monitoring program, and in particular, a monitoring system, a monitoring slave unit, and a monitoring master unit that monitor human actions using spatial feature quantities The present invention relates to a monitoring method and a monitoring program.

  Intrusion detection devices that detect human movements in a predetermined area such as a room have been developed. As an example of an intrusion detection method, for example, “Study on indoor intruder detection by UWB-IR”, Terajaka Junji et al., IEICE Transactions B, Vol. J90-B, No. 1, pp.97-100, 2007 On January 1, 2000 (Non-Patent Document 1), a method using a propagation delay profile, that is, a power delay profile by UWB-IR (Ultra Wide Band-Impulse Radio) is disclosed.

  However, in the method described in Non-Patent Document 1, interference with other wireless services becomes a problem because a wideband signal is used, and because the received signal power is used, it is affected by indoor multipath fading, The detection accuracy may deteriorate.

  As a technique for solving such a problem, for example, Japanese Patent Laid-Open No. 2008-216152 (Patent Document 1) discloses the following configuration. That is, the event detection device calculates an eigenvector, that is, an arrival angle distribution based on the received signal of each array antenna, and calculates an inner product value of the eigenvector and a normal eigenvector as a comparison reference. Then, the event detection device detects an event, that is, an intruder, based on a comparison result between the inner product value and a predetermined threshold value.

"Examination of indoor intruder detection by UWB-IR" Keiji Terasaka et al., IEICE Transactions B, Vol. J90-B, No. 1, pp.97-100, January 1, 2007

JP 2008-216152 A

  However, in the event detection device described in Patent Document 1, it is not possible to determine what route the radio wave received by the receiver has reached the receiver in the detection target area. For this reason, it is possible to detect an intruder in the detection target area, but there is a problem that it is not possible to specify where in the detection target area the intruder exists.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a monitoring system and a monitoring slave unit capable of specifying where in the monitoring target area the monitoring target person exists. It is to provide a monitoring base unit, a monitoring method and a monitoring program.

  (1) In order to solve the above problems, a monitoring system according to an aspect of the present invention is a monitoring system including a plurality of monitoring slave units for transmitting a radio signal and a monitoring master unit. The transmission area of the radio signal includes an installation position of the monitoring master unit and is different from each other between the plurality of monitoring slave units, and the plurality of monitoring slave units are radio signals having different frequencies, or , Transmitting a radio signal spectrum-spread with different spreading codes, and the monitoring master unit receives the radio signal transmitted from each of the plurality of monitoring slave units, and based on the received radio signal Then, a spatial feature amount is calculated for each wireless signal, and based on the calculated spatial feature amount, a human action in the transmission area corresponding to the wireless signal is monitored.

  Note that the monitoring slave unit does not have to be a dedicated slave unit only for transmitting a radio signal used for monitoring, and may be a slave unit that transmits some signal, for example.

  With such a configuration, the radio signal transmission area is identified from the frequency of the radio signal used for monitoring human movement or the spread code used for the radio signal used for monitoring human movement. Therefore, it is possible to specify where in the monitoring target area the monitoring target person exists.

  In addition, with the configuration in which the frequency of the transmission radio signal of each monitoring slave unit is made different, for example, transmission from a difference in frequency is performed without performing complicated control such as transmission of radio signals from a plurality of monitoring slave units in different periods. An area can be specified.

  Also, each monitoring slave unit has a configuration in which a spread code used for spectrum spreading is different, for example, complicated control such as transmitting radio signals from different monitoring slave units in different periods, or for each monitoring slave unit Setting for transmitting radio signals of different frequencies is not required.

  (2) A monitoring system according to another aspect of the present invention is a monitoring system including a plurality of monitoring slave units for transmitting a radio signal, and a monitoring master unit. The transmission area includes the installation position of the monitoring master unit and is different from each other between the plurality of monitoring slave units. The plurality of monitoring slave units transmit radio signals so that the transmission periods do not overlap each other. The monitoring master unit receives the radio signals transmitted from the plurality of monitoring slave units, calculates a spatial feature amount for each radio signal based on the received radio signals, and calculates Based on the spatial feature value, the human motion in the transmission area corresponding to the radio signal is monitored.

  With this configuration, it is possible to identify the radio signal transmission area from the radio signal transmission period used for monitoring human movements. Can be specified.

  In addition, since the transmission radio signal transmission period of each monitoring slave unit is different, the radio signal can be set to the same frequency in the monitoring master unit and the plurality of monitoring slave units, thereby facilitating the monitoring system. Can be built.

  (3) Preferably, the monitoring master unit indicates information for the plurality of monitoring slave units to synchronize with the monitoring master unit and an order in which the plurality of monitoring slave units transmit radio signals. The slave unit control signal including information and information indicating the length of the transmission period is transmitted to the plurality of monitoring slave units, and the plurality of monitoring slave units are received from the monitoring master unit. The transmission period is determined based on the slave control signal.

  In this way, the monitoring slave unit can be individually set by the configuration in which the monitoring master unit includes the information necessary for determining the transmission period and transmits the information to the monitoring slave unit. In addition, it is possible to easily determine the radio signal transmission period of each monitoring slave unit.

  In addition, with the configuration in which the monitoring master unit transmits a slave unit control signal including a plurality of information to the monitoring slave unit, each monitoring can be performed only by setting the monitoring master unit without setting the monitoring slave unit. The slave unit can be made to perform various transmission operations.

  (4) More preferably, the monitoring master unit transmits the slave unit control signal to the plurality of monitoring slave units at a timing other than the transmission period in which the plurality of monitoring slave units transmit radio signals. The slave unit control signal further includes repetition number information indicating the number of times that the plurality of monitoring slave units repeat transmission of the radio signal, and the plurality of monitoring slave units receive the slave unit control signal. Then, the wireless signal is transmitted by the number of repetitions indicated by the number of repetitions information.

  Here, when the monitoring master unit and the monitoring slave unit transmit and receive radio signals of the same frequency in a time-sharing manner, the period during which the monitoring master unit transmits the slave control signal to the monitoring slave unit is The slave unit for monitoring cannot transmit a radio signal. However, with the configuration as described above, the number of transmissions of the slave unit control signal from the monitoring master unit to the monitoring slave unit can be relatively reduced with respect to the number of transmissions of the radio signal from the monitoring slave unit. . For this reason, since the period which can monitor a human operation | movement can be lengthened by extending the transmission period which the monitoring subunit | mobile_unit transmits a radio signal, undetected can be suppressed. In addition, since the sample period for acquiring the spatial feature amount can be extended by extending the transmission period during which the monitoring slave unit transmits the radio signal, high-accuracy monitoring can be performed.

  (5) Preferably, the plurality of monitoring slave units transmit radio signals in synchronization with the monitoring master unit.

  With such a configuration, for example, monitoring errors caused by shifts in operating frequency or phase in the monitoring master unit and the plurality of monitoring slave units can be suppressed, and the monitoring accuracy can be improved.

  Preferably, the monitoring master unit detects occurrence of a human action in the transmission area.

  With such a configuration, for example, a person who has entered the transmission area can be detected well, and effective crime prevention measures can be taken.

  More preferably, when the monitoring base unit detects the occurrence of a human motion in two or more transmission areas, it determines that a human is present in an area where the two or more transmission areas overlap.

  With such a configuration, the monitoring master device can more precisely specify the area where the monitoring target person exists in the monitoring target area.

  (6) Preferably, the monitoring master unit detects that there is no or little human action in the transmission area.

  With such a configuration, it is possible to satisfactorily watch over humans in the transmission area.

  (7) In order to solve the above problem, a monitoring slave unit according to an aspect of the present invention is a monitoring system including a plurality of monitoring slave units for transmitting a radio signal and a monitoring master unit. The monitoring slave unit, wherein the wireless signal transmission area includes an installation position of the monitoring master unit and is different between the plurality of monitoring slave units and sets the frequency of the wireless signal A frequency setting unit, and a transmission unit for transmitting a radio signal having a frequency set by the frequency setting unit. The frequency setting unit includes the monitoring master unit and the plurality of monitoring slave units. The wireless signal transmitted from each of the wireless signals is received, the spatial feature amount is calculated for each wireless signal based on the received wireless signal, and the wireless signal corresponding to the wireless signal is calculated based on the calculated spatial feature amount. In the transmission area Human motion to allow monitoring that sets a different frequency among the plurality of monitoring handset.

  With such a configuration, since the radio signal transmission area can be specified from the frequency of the radio signal used for monitoring human movements, it is possible to determine where in the monitored area the monitoring target person exists. Can be identified.

  In addition, with the configuration in which the frequency of the transmission radio signal of each monitoring slave unit is made different, for example, transmission from a difference in frequency is performed without performing complicated control such as transmission of radio signals from a plurality of monitoring slave units in different periods. An area can be specified.

  (8) Moreover, the monitoring subunit | mobile_unit concerning another situation of this invention is the said monitoring subunit | mobile_unit in a monitoring system provided with the some monitoring subunit | mobile_unit for transmitting a radio signal, and the monitoring parent | base station. The transmission area of the wireless signal includes an installation position of the monitoring base unit and is different between the plurality of monitoring slave units, and a transmission unit for transmitting a wireless signal, and the transmission unit A transmission control unit for controlling the wireless communication unit, wherein the monitoring control unit receives the wireless signals transmitted from the plurality of monitoring slave units, and receives the received wireless signals. Based on the signal, a spatial feature amount is calculated for each of the wireless signals, and the plurality of monitors are configured so that a human motion in the transmission area corresponding to the wireless signal can be monitored based on the calculated spatial feature amount. Wireless signals are sent between the slave units Period to control the transmission section so as not to overlap.

  With this configuration, it is possible to identify the radio signal transmission area from the radio signal transmission period used for monitoring human movements. Can be specified.

  In addition, since the transmission radio signal transmission period of each monitoring slave unit is different, the radio signal can be set to the same frequency in the monitoring master unit and the plurality of monitoring slave units, thereby facilitating the monitoring system. Can be built.

  (9) Moreover, the monitoring subunit | mobile_unit concerning another situation of this invention is the said monitoring subunit | mobile_unit in a monitoring system provided with the some monitoring subunit | mobile_unit for transmitting a radio signal, and the monitoring parent | base station. The wireless signal transmission area includes an installation position of the monitoring master unit, and is different from each other among the plurality of monitoring slave units, and is a spread for setting a spreading code used for the radio signal A code setting unit, and a transmission unit for transmitting a radio signal spectrum-spread with the spreading code set by the spreading code setting unit, the spreading code setting unit including the monitoring master unit, The wireless signal transmitted from each of the plurality of monitoring slave units is received, and based on each received wireless signal, a spatial feature amount is calculated for each wireless signal, and based on the calculated spatial feature amount wireless As can be monitored human operation in the transmission area corresponding to the item, it sets a different spreading code among the plurality of monitoring handset.

  With such a configuration, the transmission area of the wireless signal can be identified from the spreading code used for the wireless signal used for monitoring human movements. It can be specified whether it exists.

  Also, each monitoring slave unit has a configuration in which a spread code used for spectrum spreading is different, for example, complicated control such as transmitting radio signals from different monitoring slave units in different periods, or for each monitoring slave unit Setting for transmitting radio signals of different frequencies is not required.

  (10) In order to solve the above-described problem, a monitoring master unit according to an aspect of the present invention is a monitoring system including a plurality of monitoring slave units for transmitting a radio signal and a monitoring master unit. The monitoring base unit, wherein the wireless signal transmission area includes an installation position of the monitoring base unit and is different between the plurality of monitoring slave units, and between the plurality of monitoring slave units The reception unit for receiving the radio signals having different frequencies from each other, or the radio signals spectrum-spread with different spreading codes in the plurality of monitoring slave units from the plurality of monitoring slave units, and each received Based on the radio signal, a spatial feature is calculated for each radio signal, and an operation for monitoring a human action in the transmission area corresponding to the radio signal based on the calculated spatial feature And, including the.

  With such a configuration, the radio signal transmission area is identified from the frequency of the radio signal used for monitoring human movement or the spread code used for the radio signal used for monitoring human movement. Therefore, it is possible to specify where in the monitoring target area the monitoring target person exists.

  In addition, with the configuration in which the frequency of the transmission radio signal of each monitoring slave unit is made different, for example, transmission from a difference in frequency is performed without performing complicated control such as transmission of radio signals from a plurality of monitoring slave units in different periods. An area can be specified.

  Also, each monitoring slave unit has a configuration in which a spread code used for spectrum spreading is different, for example, complicated control such as transmitting radio signals from different monitoring slave units in different periods, or for each monitoring slave unit Setting for transmitting radio signals of different frequencies is not required.

  (11) Further, a monitoring master unit according to another aspect of the present invention is the above monitoring master unit in a monitoring system comprising a plurality of monitoring slave units for transmitting radio signals and a monitoring master unit. The transmission area of the radio signal includes an installation position of the monitoring master unit and is different between the plurality of monitoring slave units, and the transmission periods of the plurality of monitoring slave units overlap each other. A reception unit for receiving the wireless signal transmitted so as not to be, and based on each received wireless signal, a spatial feature is calculated for each wireless signal, and based on the calculated spatial feature And a calculation unit for monitoring a human operation in the transmission area corresponding to the radio signal.

  With this configuration, it is possible to identify the radio signal transmission area from the radio signal transmission period used for monitoring human movements. Can be specified.

  In addition, since the transmission radio signal transmission period of each monitoring slave unit is different, the radio signal can be set to the same frequency in the monitoring master unit and the plurality of monitoring slave units, thereby facilitating the monitoring system. Can be built.

  (12) In order to solve the above problem, a monitoring method according to an aspect of the present invention is a monitoring method in a monitoring system including a plurality of monitoring slave units for transmitting a radio signal and a monitoring master unit. Wherein the plurality of monitoring slave units include the installation positions of the monitoring master units, and wireless signals of different frequencies to the transmission areas that are different between the plurality of monitoring slave units, or mutually A step of transmitting a radio signal spectrum-spread with different spreading codes, and the monitoring master unit receives the radio signal transmitted from each of the plurality of monitoring slave units, and based on each received radio signal Calculating a spatial feature amount for each of the wireless signals, and the monitoring base unit based on the calculated spatial feature amount of a human in the transmission area corresponding to the wireless signal. Includes the step of monitoring the work, the.

  With such a configuration, the radio signal transmission area is identified from the frequency of the radio signal used for monitoring human movement or the spread code used for the radio signal used for monitoring human movement. Therefore, it is possible to specify where in the monitoring target area the monitoring target person exists.

  In addition, with the configuration in which the frequency of the transmission radio signal of each monitoring slave unit is made different, for example, transmission from a difference in frequency is performed without performing complicated control such as transmission of radio signals from a plurality of monitoring slave units in different periods. An area can be specified.

  Also, each monitoring slave unit has a configuration in which a spread code used for spectrum spreading is different, for example, complicated control such as transmitting radio signals from different monitoring slave units in different periods, or for each monitoring slave unit Setting for transmitting radio signals of different frequencies is not required.

  (13) A monitoring method according to another aspect of the present invention is a monitoring method in a monitoring system including a plurality of monitoring slave units for transmitting a radio signal and a monitoring master unit. A plurality of monitoring slave units transmitting radio signals to the transmission areas including the installation positions of the monitoring master units and different from each other among the plurality of monitoring slave units so that the transmission periods do not overlap each other; The monitoring master unit receives the radio signals transmitted from the plurality of monitoring slave units, and calculates a spatial feature amount for each radio signal based on the received radio signals; And the monitoring base unit monitoring a human operation in the transmission area corresponding to the radio signal based on the calculated spatial feature amount.

  With this configuration, it is possible to identify the radio signal transmission area from the radio signal transmission period used for monitoring human movements. Can be specified.

  In addition, since the transmission radio signal transmission period of each monitoring slave unit is different, the radio signal can be set to the same frequency in the monitoring master unit and the plurality of monitoring slave units, thereby facilitating the monitoring system. Can be built.

  (14) In order to solve the above-described problem, a monitoring program according to an aspect of the present invention is used in a monitoring system including a plurality of monitoring slave units for transmitting a radio signal and a monitoring master unit. A monitoring program, wherein the plurality of monitoring slave units include a position where the monitoring master unit is installed in a computer, and wireless signals having different frequencies are transmitted to different transmission areas between the plurality of monitoring slave units. Transmitting a signal or a radio signal spectrum-spread with different spreading codes, and the monitoring master unit receives the radio signals transmitted from the plurality of monitoring slave units, respectively, A step of calculating a spatial feature amount for each of the wireless signals based on the wireless signal, and the monitoring base unit calculates the wireless signal based on the calculated spatial feature amount. A step of monitoring the human operation in the corresponding said transmission area, is executed.

  With such a configuration, the radio signal transmission area is identified from the frequency of the radio signal used for monitoring human movement or the spread code used for the radio signal used for monitoring human movement. Therefore, it is possible to specify where in the monitoring target area the monitoring target person exists.

  In addition, with the configuration in which the frequency of the transmission radio signal of each monitoring slave unit is made different, for example, transmission from a difference in frequency is performed without performing complicated control such as transmission of radio signals from a plurality of monitoring slave units in different periods. An area can be specified.

  In addition, by using a configuration in which spread codes used for spread spectrum are different in each invasion monitoring slave unit, for example, complicated control such as transmitting radio signals from different monitoring slave units in different periods, or monitoring slave unit There is no need for setting for transmitting radio signals having different frequencies.

  (15) A monitoring program according to another aspect of the present invention is a monitoring program used in a monitoring system including a plurality of monitoring slave units for transmitting radio signals and a monitoring master unit. In the computer, the plurality of monitoring slave units include a radio signal so that the transmission periods do not overlap with each other, including the installation positions of the monitoring master unit and different transmission areas between the plurality of monitoring slave units. And the monitoring master unit receives the radio signals transmitted from the plurality of monitoring slave units, and based on the received radio signals, the spatial feature amount is determined for each radio signal. And a step of monitoring the human motion in the transmission area corresponding to the radio signal based on the calculated spatial feature amount. That.

  With this configuration, it is possible to identify the radio signal transmission area from the radio signal transmission period used for monitoring human movements. Can be specified.

  In addition, since the transmission radio signal transmission period of each monitoring slave unit is different, the radio signal can be set to the same frequency in the monitoring master unit and the plurality of monitoring slave units, thereby facilitating the monitoring system. Can be built.

  According to the present invention, it is possible to specify at which location in the monitoring target area the monitoring target person exists.

It is a figure which shows the usage image of the intrusion detection system which concerns on Embodiment 1 of this invention. It is a figure which shows the structure of the main | base station for intrusion detection of the intrusion detection system which concerns on Embodiment 1 of this invention. It is a figure which shows the table which matched the transmission area, the intrusion detection subunit | mobile_unit, and transmission frequency memorize | stored in RAM of the intrusion detection system which concerns on Embodiment 1 of this invention. It is a figure which shows the structure of the subunit | mobile_unit for intrusion detection of the intrusion detection system which concerns on Embodiment 1 of this invention. It is the sequence diagram which defined the operation | movement procedure at the time of the intrusion detection system which concerns on Embodiment 1 of this invention performing an intrusion detection operation | movement. It is a figure which shows the relationship of the transmission / reception of the radio signal by the main | base station for intrusion detection of the intrusion detection system which concerns on Embodiment 1 of this invention, and several subunit | mobile_unit for intrusion detection. It is a figure which shows the usage image of the intrusion detection system which concerns on Embodiment 2 of this invention. It is a figure which shows the structure of the main | base station for intrusion detection of the intrusion detection system which concerns on Embodiment 2 of this invention. It is a figure which shows the information contained in the radio signal transmitted from the main | base station for intrusion detection of the intrusion detection system which concerns on Embodiment 2 of this invention. It is a figure which shows the table which matched the transmission area, the intrusion detection subunit | mobile_unit, and transmission period memorize | stored in RAM of the intrusion detection system which concerns on Embodiment 2 of this invention. It is a figure which shows the structure of the subunit | mobile_unit for intrusion detection of the intrusion detection system which concerns on Embodiment 2 of this invention. It is the sequence diagram which defined the operation | movement procedure at the time of the intrusion detection system which concerns on Embodiment 2 of this invention performing an intrusion detection operation | movement. It is a figure which shows the relationship of transmission / reception of the radio signal by the main | base station for intrusion detection of the intrusion detection system which concerns on Embodiment 2 of this invention, and the subunit | mobile_unit for intrusion detection. It is a figure which shows the information contained in the radio signal transmitted from the main | base station for intrusion detection of the intrusion detection system which concerns on the modification 1 of Embodiment 2 of this invention. It is a figure which shows the relationship of transmission / reception of the radio signal by the main | base station for intrusion detection of the intrusion detection system which concerns on the modification 1 of Embodiment 2 of this invention, and the subunit | mobile_unit for intrusion detection. It is a figure which shows the structure of the main | base station for intrusion detection of the intrusion detection system which concerns on the modification 2 of Embodiment 2. FIG. It is a figure which shows the structure of the subunit | mobile_unit for intrusion detection of the intrusion detection system which concerns on the modification 2 of Embodiment 2. FIG. FIG. 10 is a sequence diagram that defines an operation procedure when the intrusion detection system according to the second modification of the second embodiment performs an intrusion detection operation. It is a figure which shows the usage image of the intrusion detection system which concerns on Embodiment 3 of this invention. It is a figure which shows the structure of the main | base station for intrusion detection of the intrusion detection system which concerns on Embodiment 3 of this invention. The transmission area, the intrusion detection slave unit, and the spreading code used for each radio signal transmitted by the intrusion detection slave unit stored in the RAM of the intrusion detection system according to the third embodiment of the present invention are associated with each other. FIG. It is a figure which shows the structure of the subunit | mobile_unit for intrusion detection of the intrusion detection system which concerns on Embodiment 3 of this invention. It is the sequence diagram which defined the operation | movement procedure at the time of the intrusion detection system which concerns on Embodiment 3 of this invention performing intrusion detection operation | movement. It is a figure which shows the relationship of transmission / reception of the radio signal by the main | base station for intrusion detection of the intrusion detection system which concerns on Embodiment 3 of this invention, and the subunit | mobile_unit for intrusion detection.

(Embodiment 1)
Hereinafter, Embodiment 1 of the present invention will be described with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals and description thereof will not be repeated.

  FIG. 1 is a diagram showing a usage image of an intrusion detection system 201 according to Embodiment 1 of the present invention.

  Referring to FIG. 1, an intrusion detection system (monitoring system) 201 according to Embodiment 1 of the present invention functions as a moving object detection sensor. As the intrusion detection system 201, an intrusion detection parent device (monitoring parent device) 101 for receiving wireless signals and an intrusion detection child device (monitoring child devices) 102a, 102b, 102c for transmitting wireless signals are used. , 102d are installed in a monitoring target area (hereinafter referred to as “detection target area”), for example, indoors.

  The intrusion detection system 201 receives the radio signal transmitted from the intrusion detection slave units 102a, 102b, 102c, and 102d within a predetermined interval or continuously by the intrusion detection master unit 101, and based on the received radio signal. By performing signal processing in this manner, for example, the presence / absence of a human operation that has entered the room is detected as a monitoring of the human operation.

  Specifically, the intrusion detection master device 101 in the intrusion detection system 201 is an array type radio wave sensor, and includes a plurality of receiving antenna elements, and realizes a moving object detection function using changes in radio wave propagation. The radio waves used by the intrusion detection master device 101 are not limited in frequency, bandwidth, and the like in principle.

  Intrusion detection slave units 102a, 102b, 102c, and 102d have radio signal transmission areas including the installation position of intrusion detection master unit 101, and radio signal transmission areas include intrusion detection slave units 102a, 102b, and 102c. , 102d are installed to be different from each other. In the example shown in FIG. 1, the radio signal transmission area of the intrusion detection slave unit 102a is the indoor north area AN, and the radio signal transmission area of the intrusion detection slave unit 102b is the indoor west area AW. The radio signal transmission area of the intrusion detection slave unit 102c is the indoor east area AE, and the radio signal transmission area of the intrusion detection slave unit 102d is the indoor south area AS.

[Configuration and basic operation]
(Master device for intrusion detection)
FIG. 2 is a diagram showing the configuration of the intrusion detection master device 101 of the intrusion detection system 201. Referring to FIG. 2, an intrusion detection master device 101 includes an array antenna unit 11, a receiving unit 12, a branch circuit 13, an oscillator 14a, an oscillator 14b, a control unit 15, an intrusion detection calculation unit (calculation). Part) 16, a branch circuit 17, an oscillator 18, and a switch 19. The intrusion detection calculation unit 16 includes a spatial feature amount calculation unit 61, a RAM 62, a detection unit 63, and an alarm unit 64.

  The array antenna unit 11 includes, for example, four antennas. The receiving unit 12 includes a duplexer 21, a low noise amplifier 22, an orthogonal demodulator 23, an A / D converter (ADC) 24, and a power amplifier 25 corresponding to the antennas in the array antenna unit 11. Contains 4 sets. These sets in the receiving unit 12 are referred to as RX1, RX2, RX3, and RX4, respectively.

  The duplexer 21 outputs the radio signal received from the array antenna unit 11 to the low noise amplifier 22. Further, the duplexer 21 outputs the radio signal received from the power amplifier 25 to the array antenna unit 11. The duplexer 21 separates the radio signal received from the array antenna unit 11 and the radio signal received from the power amplifier 25 to prevent interference between both signals.

  The low noise amplifier 22 amplifies and outputs the radio signal that has passed through the duplexer 21.

  The quadrature demodulator 23 multiplies the radio signal received from the low noise amplifier 22 by the local signal received from the oscillator 14a or the oscillator 14b via the branch circuit 13 and the switch 19 to thereby obtain a signal received from the low noise amplifier 22. Is demodulated by, for example, quadrature demodulation and converted into baseband I and Q signals and output to the A / D converter 24.

  The A / D converter 24 converts the I signal and the Q signal received from the quadrature demodulator 23 into n-bit (n is a natural number of 2 or more) digital signals, and outputs them to the intrusion detection calculation unit 16.

  The oscillator 18 generates an oscillation signal having a frequency f0 and outputs the oscillation signal to the branch circuit 17. The branch circuit 17 outputs a radio signal that is an oscillation signal of the frequency f0 to the power amplifiers 25 of the four sets RX1, RX2, RX3, RX4 of the reception unit 12.

  The power amplifier 25 amplifies the radio signal having the frequency f 0 received from the oscillator 18 via the branch circuit 17 and outputs the amplified signal to the duplexer 21. Furthermore, the duplexer 21 outputs the radio signal received from the power amplifier 25 to the array antenna unit 11, and the array antenna unit 11 transmits a radio signal having a frequency f0.

  The oscillator 14a generates a local signal that is an oscillation signal. The oscillator 14b generates a local signal that is an oscillation signal.

  The control unit 15 controls the frequency of the local signal generated by the oscillator 14a by adjusting the level of the control voltage CV1 applied to the oscillator 14a. In addition, the control unit 15 controls the frequency of the local signal generated by the oscillator 14b by adjusting the level of the control voltage CV2 applied to the oscillator 14b. Further, the control unit 15 switches the connection of the switch 19 by outputting a switch switching signal SWA to the switch 19. The control unit 15 performs control to switch the frequency of the local signal applied to the quadrature demodulator 23 by using the control voltages CV1 and CV2 and the switch switching signal SWA.

  More specifically, first, the control unit 15 controls the oscillator 14a to output a local signal having a frequency f1 from the oscillator 14a. Further, the control unit 15 controls the switch 19 to connect the branch circuit 13 and the oscillator 14a. Thereby, the quadrature demodulator 23 receives the local signal of the frequency f1. At this time, the control unit 15 adjusts the control voltage CV2 and causes the oscillator 14b to generate a local signal having the frequency f2.

  Next, the control unit 15 controls the switch 19 to connect the branch circuit 13 and the oscillator 14b. Thereby, the quadrature demodulator 23 receives the local signal of the frequency f2. At this time, the control unit 15 adjusts the level of the control voltage CV1, and causes the oscillator 14a to generate a local signal having the frequency f3.

  Next, the control unit 15 controls the switch 19 to connect the branch circuit 13 and the oscillator 14a. Thereby, the quadrature demodulator 23 receives the local signal of the frequency f3. At this time, the control unit 15 supplies the control voltage CV2 to the oscillator 14b, and causes the oscillator 14b to generate a local signal having the frequency f4.

  Next, the control unit 15 controls the switch 19 to connect the branch circuit 13 and the oscillator 14b. Thereby, the quadrature demodulator 23 receives the local signal of the frequency f4. At this time, the control unit 15 applies the control voltage CV1 to the oscillator 14a, and causes the oscillator 14a to generate a local signal having the frequency f1.

  In this way, by switching the frequency of the local signal received by the quadrature demodulator 23, the intrusion detection master unit 101 has the frequencies f1, f2, f3 from the intrusion detection slave units 102a, 102b, 102c, and 102d. Each radio signal of f4 is received at a different timing.

  The branch circuit 13 outputs the local signal received from the oscillator 14a or the oscillator 14b to each of the quadrature demodulators 23 of the four sets RX1, RX2, RX3, RX4 of the reception unit 12.

  The intrusion detection calculation unit 16 receives digital signals from the four sets RX1, RX2, RX3, RX4 of the reception unit 12 and performs calculation processing for intrusion detection.

  In the intrusion detection calculation unit 16, the spatial feature amount calculation unit 61 receives digital signals corresponding to each antenna in the array antenna unit 11 from the reception unit 12, and is received by the array antenna unit 11 based on these digital signals. The radio signal level and arrival timing are calculated. Then, based on the calculation result, the spatial feature amount calculation unit 61 calculates a spatial feature amount for each radio signal transmission area, that is, for each transmission area AN, transmission area AW, transmission area AE, and transmission area AS.

More specifically, the spatial feature value calculation unit 61 extracts a spatial feature value using the arrival angle distribution, for example, similarly to the configuration described in Patent Document 1. That is, the spatial feature quantity calculation unit 61 extracts the spatial feature quantity P (t) by calculating the inner product of the eigenvectors. This inner product indicates the amount of change from the initial vector serving as a comparison reference. Assuming that the initial vector, that is, the eigenvector when there is no intruder is vno and the eigenvector at the observation time t is vob (t), the spatial feature P (t) is expressed by the following equation.
P (t) = vno · vob (t)

  FIG. 3 is a view showing a table stored in the RAM 62 shown in FIG. 2 in which the transmission area, the intrusion detection slave units 102a, 102b, 102c, and 102d are associated with the transmission frequency fn of each intrusion detection slave unit. is there.

  Referring to FIG. 3, RAM 62 includes intrusion detection slave units 102a, 102b, 102c, and 102d, and a north area AN and a west area AW that are transmission areas of these intrusion detection slave units 102a, 102b, 102c, and 102d. A table in which the east-side area AE and the south-side area AS and the transmission frequencies f1, f2, f3, and f4 of the respective radio signals transmitted by the intrusion detection slave units 102a, 102b, 102c, and 102d are associated in advance. Remember.

  The detection unit 63 monitors a human action in the transmission area for each frequency of the radio signal based on the spatial feature amount P (t) calculated by the spatial feature amount calculation unit 61. Specifically, the detection unit 63 detects the occurrence of a human motion in the transmission area for each frequency of the radio signal based on the spatial feature value P (t).

  Here, the closer the spatial feature P (t) is to “1”, the closer the state of the transmission area at the observation time t is to the normal state where no intruder exists in the transmission area. For this reason, when the spatial feature amount P (t) is less than a predetermined threshold value, for example, “0.9”, the detection unit 63 causes human action in the transmission area, that is, a human has entered the transmission area. Judge that

  Then, when detecting a human motion, the detection unit 63 refers to a table stored in the RAM 62 and specifies a transmission area where the human motion is detected from the frequency of the wireless signal in which the human motion is detected. That is, the detection unit 63 specifies the location in the detection target area where the intruder is present.

  The alarm unit 64 transmits an alarm signal to a security company, for example, in order to notify that the human motion has been detected and the area in which the human motion has been detected.

(Intrusion detection slave unit)
FIG. 4 is a diagram illustrating the configuration of the intrusion detection slave units 102a, 102b, 102c, and 102d of the intrusion detection system 201. The intrusion detection slave units 102a, 102b, 102c, and 102d have the same configuration.

  Referring to FIG. 4, intrusion detection slave units 102a, 102b, 102c, and 102d include an antenna 31, a duplexer 32, a synchronization signal generation unit 33, a transmission unit 34, and a frequency setting unit 35. It has.

  The antenna 31 receives the radio signal having the frequency f0 transmitted from the intrusion detection master device 101.

  The duplexer 32 outputs the radio signal received from the antenna 31 to the synchronization signal generation unit 33. Further, the duplexer 32 outputs a radio signal that is an oscillation signal received from the transmission unit 34 to the antenna 31. The duplexer 32 separates the radio signal received from the antenna 31 and the radio signal received from the transmission unit 34 to prevent interference between the two signals.

  The synchronization signal generator 33 includes a 1 / N1 frequency divider 41, a 1 / R frequency divider 42, a phase comparison circuit (PD) 43, a bandpass filter (BPF) 44, and an oscillator 45. The synchronization signal generation unit 33 generates a synchronization signal so that the intrusion detection slave units 102a, 102b, 102c, and 102d transmit a radio signal in synchronization with the intrusion detection master unit 101.

The 1 / N1 frequency dividing circuit 41 divides the radio signal received from the duplexer 32 into 1 / N1. Further, the 1 / R frequency dividing circuit 42 _divides the synchronizing signal having the frequency f _REF by 1 / R. The phase comparison circuit 43 detects the phase difference between the radio signal received from the 1 / N1 frequency divider circuit 41 and the synchronization signal received from the 1 / R frequency divider circuit 42, and outputs a phase difference signal indicating the detection result.

  The band pass filter 44 attenuates a component outside a predetermined frequency band among the frequency components of the phase difference signal received from the phase comparison circuit 43.

The oscillator 45 generates a synchronization signal having a frequency f _REF based on the phase difference signal that has passed through the band-pass filter 44.

  The transmission unit 34 includes a 1 / N2 frequency divider 51, a 1 / R frequency divider 52, a phase comparison circuit (PD) 53, a band pass filter (BPF) 54, an oscillator 55, a power amplifier 56, including. The transmission unit 34 is an oscillation signal having the frequency fn set by the frequency setting unit 35 based on the synchronization signal generated by the synchronization signal generation unit 33, and is a radio signal having the frequency f0 received from the intrusion detection master unit 101. An oscillation signal synchronized with the signal is generated, and a radio signal that is this oscillation signal is transmitted.

The 1 / N2 frequency dividing circuit 51 divides the oscillation signal having the frequency fn by 1 / N2. The 1 / R frequency dividing circuit 52 _divides the frequency f _REF synchronization signal generated by the synchronization signal generation unit 33 into 1 / R. The phase comparison circuit 53 detects the phase difference between the radio signal received from the 1 / N2 frequency divider circuit 51 and the radio signal received from the 1 / R frequency divider circuit 52, and outputs a phase difference signal indicating the detection result.

  Bandpass filter 54 attenuates a component outside a predetermined frequency band among the frequency components of the phase difference signal received from phase comparison circuit 53.

  The oscillator 55 generates an oscillation signal having a frequency fn based on the phase difference signal that has passed through the bandpass filter 54.

  Here, the frequency fn set by the frequency setting unit 35 is different between the intrusion detection slave units 102a, 102b, 102c, and 102d. For example, the frequency in each of the intrusion detection slave units 102a, 102b, 102c, and 102d is such that the intrusion detection slave units 102a, 102b, 102c, and 102d transmit radio signals of frequencies f1, f2, f3, and f4, respectively. The setting unit 35 sets the frequency fn.

  The power amplifier 56 amplifies the oscillation signal received from the oscillator 55 and outputs the amplified signal to the duplexer 32.

[Operation]
Next, an operation when the intrusion detection system 201 according to Embodiment 1 of the present invention performs intrusion detection will be described.

  FIG. 5 is a sequence diagram defining an operation procedure when the intrusion detection system 201 according to Embodiment 1 of the present invention performs an intrusion detection operation, and FIG. 6 is an intrusion detection according to Embodiment 1 of the present invention. It is a figure which shows the transmission / reception relationship of the radio signal by the main | base station 101 for intrusion detection of the system 201, and the subunit | mobile_unit 102a, 102b, 102c, 102d for intrusion detection.

  The intrusion detection master device 101 and the intrusion detection slave devices 102a, 102b, 102c, and 102d in the intrusion detection system 201 read and execute a program including each step of the sequence from a memory (not shown). This program can be installed externally. The installed program is distributed in a state stored in a recording medium, for example.

  Referring to FIG. 5, first, intrusion detection master device 101 transmits the radio signal of frequency f0 generated by oscillator 18 to intrusion detection slave devices 102a, 102b, 102c, and 102d (step S1). As shown in FIG. 6, the intrusion detection master device 101 continuously transmits a radio signal having a frequency f0 while intrusion detection is being performed by the intrusion detection system 201.

Next, each synchronization signal generator 33 of intrusion detection slave units 102a, 102b, 102c, and 102d receives a radio signal of frequency f0 from intrusion detection master unit 101 and generates a synchronization signal of frequency _fREF (step). S2).

  Next, the transmission units 34 of the intrusion detection slave units 102a, 102b, 102c, and 102d receive the synchronization signal generated by the synchronization signal generation unit 33, and generate an oscillation signal of the frequency fn (step S3).

  Such generation of the synchronization signal (step S2) and generation of the oscillation signal (step S3) are respectively performed by the intrusion detection slave units 102a, 102b, 102c, and 102d. The frequency fn is the frequencies f1, f2, f3, and f4 in the intrusion detection slave units 102a, 102b, 102c, and 102d, respectively.

  Next, intrusion detection slave units 102a, 102b, 102c, and 102d transmit radio signals that are oscillation signals of frequency fn to intrusion detection master unit 101 (step S4). Similarly to the radio signal having the frequency f0 transmitted from the intrusion detection master device 101, the intrusion detection slave devices 102a, 102b, 102c, and 102d have the frequency fn while the intrusion detection system 201 performs the intrusion detection. Transmits radio signals continuously.

  Next, intrusion detection master device 101 receives radio signals from intrusion detection slave devices 102a, 102b, 102c, and 102d (steps S5 to S8). Specifically, the control unit 15 of the intrusion detection master unit 101 controls the oscillator 14a, the oscillator 14b, and the switch 19 to switch the frequency of the local signal received by the quadrature demodulator 23. As a result, the intrusion detection master device 101 performs reception processing of radio signals of frequencies f1, f2, f3, and f4 at different timings.

  For example, as shown in FIG. 6, intrusion detection master device 101 performs reception processing of a radio signal having frequency f1 in period T1 (step S5), and performs reception processing of a radio signal having frequency f2 in period T2 (step S6). ), Radio signal reception processing at frequency f3 is performed in period T3 (step S7), and radio signal reception processing at frequency f4 is performed in period T4 (step S8).

  Next, the spatial feature value calculation unit 61 of the intrusion detection master device 101 calculates a spatial feature value for each radio signal from each intrusion detection slave device (step S9). Then, the detection unit 63 of the intrusion detection master device 101 performs intrusion detection based on the spatial feature amount.

  Next, the detection unit 63 refers to the table stored in the RAM 62 and identifies the transmission area where the human motion is detected from the frequency of the radio signal in which the human motion is detected. That is, it is specified where the intruder exists in the detection target area (step S10).

  Next, the alarm unit 64 transmits a signal notifying that a human motion has been detected and a transmission area in which the human motion has been detected to a security company or the like (step S11).

  In the intrusion detection system 201 according to Embodiment 1 of the present invention, the detection unit 63 of the intrusion detection master device 101 detects a human intrusion into the transmission area as the occurrence of a human action in the transmission area. However, the present invention is not limited to this. The detection unit 63 may be configured to detect the start of a human action existing in the transmission area as the occurrence of a human action in the transmission area. Also in this case, the detection unit 63 can detect the start of human action existing in the transmission area based on the variation of the spatial feature P (t).

  By the way, in the event detection apparatus described in Patent Document 1, it is impossible to determine what route the radio wave received by the receiver has reached the receiver in the detection target area. For this reason, it is possible to detect an intruder in the detection target area, but there is a problem that it is not possible to specify where in the detection target area the intruder exists.

  On the other hand, in the intrusion detection system 201 according to the first embodiment of the present invention, the wireless signal transmission area transmitted by the intrusion detection slave units 102a, 102b, 102c, and 102d is the installation of the intrusion detection master unit 101. It includes a position and is different from each other between the intrusion detection slave units 102a, 102b, 102c, and 102d. The intrusion detection slave units 102a, 102b, 102c, and 102d transmit radio signals having different frequencies. Further, the intrusion detection master device 101 receives the radio signals transmitted from the intrusion detection slave devices 102a, 102b, 102c, and 102d, and based on the received radio signals, the spatial feature amount for each radio signal. Based on the calculated spatial feature amount, the human motion in the transmission area corresponding to the radio signal is monitored.

  With this configuration, the radio signal transmission area can be identified from the frequency of the radio signal used to monitor human movements, so it is possible to identify where intruders exist in the detection target area. can do.

  In addition, by using a configuration in which the frequencies of the transmission wireless signals of the intrusion detection slave units 102a, 102b, 102c, and 102d are made different, for example, radio signals are transmitted from the intrusion detection slave units 102a, 102b, 102c, and 102d in different periods. The transmission area can be identified from the difference in frequency without performing complicated control.

  In addition, in intrusion detection system 201 according to Embodiment 1 of the present invention, intrusion detection slave units 102a, 102b, 102c, and 102d transmit radio signals in synchronization with intrusion detection master unit 101.

  With such a configuration, for example, monitoring errors caused by operating frequency or phase shifts in the intrusion detection master unit 101 and the intrusion detection slave units 102a, 102b, 102c, and 102d are suppressed, and the monitoring accuracy is improved. Can do.

  In addition, in intrusion detection system 201 according to Embodiment 1 of the present invention, intrusion detection master device 101 detects the occurrence of a human action in the transmission area.

  With such a configuration, for example, a person who has entered the transmission area can be detected well, and effective crime prevention measures can be taken.

  In the intrusion detection system 201 according to the first embodiment of the present invention, when the intrusion detection master unit 101 detects a human action in two or more transmission areas, the intrusion detection master unit 101 is in an area where two or more transmission areas overlap. It may be determined that a human is present.

  With this configuration, the intrusion detection master device 101 can more precisely specify an area where an intruder exists in the detection target area.

  Next, another embodiment of the present invention will be described with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals and description thereof will not be repeated.

(Embodiment 2)
The second embodiment of the present invention will be described below with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals and description thereof will not be repeated.

  The intrusion detection system (monitoring system) 202 according to the second embodiment of the present invention transmits a radio signal so that intrusion detection slave units (monitoring slave units) 104a, 104b, 104c, and 104d do not overlap with each other in their transmission periods. To be sent. FIG. 7 is a diagram showing a usage image of the intrusion detection system 202 according to the second embodiment of the present invention.

  Referring to FIG. 7, as intrusion detection system 202, similar to intrusion detection system 201 according to Embodiment 1 shown in FIG. 2, an intrusion detection master device (monitoring master device) for receiving a radio signal 103 and intrusion detection slaves 104a, 104b, 104c, and 104d for transmitting wireless signals are installed in a detection target area, for example, a room.

  The intrusion detection system 202 receives the radio signal transmitted from the intrusion detection slave units 104a, 104b, 104c, and 104d within a predetermined interval or continuously by the intrusion detection master unit 103, and based on the received radio signal. By performing signal processing in this manner, for example, the presence / absence of a human operation that has entered the room is detected as a monitoring of the human operation.

  Intrusion detection slave units 104a, 104b, 104c, and 104d have radio signal transmission areas including the installation position of intrusion detection master unit 103, and radio signal transmission areas are intrusion detection slave units 104a, 104b, and 104c. , 104d are installed differently. In the example shown in FIG. 7, the radio signal transmission area of the intrusion detection slave unit 104a is the indoor north area AN, and the radio signal transmission area of the intrusion detection slave unit 104b is the indoor west area AW. The radio signal transmission area of the intrusion detection slave unit 104c is the indoor east area AE, and the radio signal transmission area of the intrusion detection slave unit 104d is the indoor south side area AS.

[Configuration and basic operation]
(Master device for intrusion detection)
FIG. 8 is a diagram showing a configuration of intrusion detection master device 103 of intrusion detection system 202 according to Embodiment 2 of the present invention, and FIG. 9 shows intrusion detection system 202 according to Embodiment 2 of the present invention. It is a figure which shows the information contained in the radio signal transmitted from the main | base station 103 for intrusion detection.

  Referring to FIG. 8, intrusion detection master unit 103 includes array antenna unit 11, receiving unit 71, control unit 72, branch circuit 73, oscillator 74, quadrature modulator 75, and slave unit control information. A generation unit 76, a switch 79, and an intrusion detection calculation unit 16 are provided. The intrusion detection calculation unit 16 includes a spatial feature amount calculation unit 61, a RAM 62, a detection unit 63, and an alarm unit 64.

  The array antenna unit 11 has the same configuration as the array antenna unit 11 of the intrusion detection master device 101 of the intrusion detection system 201 according to Embodiment 1 shown in FIG.

  The receiving unit 71 corresponds to the antenna in the array antenna unit 11, and includes a bandpass filter (BPF) 81, a switch 82, a low noise amplifier 83, an orthogonal demodulator 84, an A / D converter (ADC) 85, Four sets of the power amplifier 86 and the switch 87 are included. These sets in the reception unit 71 are referred to as RX1, RX2, RX3, and RX4, respectively.

  The band pass filter 81 attenuates a component outside a predetermined frequency band among the frequency components of the radio signal received by the corresponding antenna in the array antenna unit 11.

  The low noise amplifier 83 amplifies the radio signal received from the band pass filter 81 and outputs it.

  The quadrature demodulator 84 multiplies the radio signal received from the low noise amplifier 83 and the oscillation signal generated by the oscillator 74 and the local signal received via the switch 79, the branch circuit 73, and the switch 87. The signal received from the low noise amplifier 83 is orthogonally demodulated and converted into an I signal and a Q signal in the baseband and output to the A / D converter 85.

  A / D converter 85 is an n-bit (n is a natural number of 2 or more) digital signal of the I signal and Q signal received from quadrature demodulator 84 at the sampling timing based on control signal ST provided from control unit 72. And output to the intrusion detection calculation unit 16.

  As shown in FIG. 9, the slave unit control information generation unit 76 is information for synchronizing the preamble and the intrusion detection slave units 104a, 104b, 104c, and 104d with the intrusion detection master unit 103. Synchronization information composed of words (UW), order information indicating the order in which intrusion detection slave units 104a, 104b, 104c, and 104d transmit radio signals, and intrusion detection slave units 104a, 104b, 104c, and 104d Transmission period information indicating the length of the transmission period of each radio signal to be transmitted and frequency information indicating the frequency of each radio signal are generated. The subunit | mobile_unit control information generation part 76 outputs I signal and Q signal which show the produced | generated information to the quadrature modulator 75. FIG.

  The oscillator 74 generates a local signal that is an oscillation signal having a frequency f1. The quadrature modulator 75 multiplies the local signal of the frequency f1 generated by the oscillator 74 by the I signal and the Q signal indicating the information generated by the slave unit control information generation unit 76, thereby obtaining the I signal and the Q signal. Is quadrature modulated to generate a radio signal as a slave control signal and output to the branch circuit 73 via the switch 79.

  Power amplifier 86 amplifies the radio signal received from quadrature modulator 75 via switch 79, branch circuit 73, and switch 87 and outputs the amplified signal to bandpass filter 81.

  The control unit 72 switches the connection of the switch 82 by giving the switch switching signal SWB to the switch 82. Further, the control unit 72 switches the connection of the switch 87 by giving a switch switching signal SWC to the switch 87. Further, the control unit 72 switches the connection of the switch 79 by giving a switch switching signal SWD to the switch 79. In addition, the control unit 72 controls the A / D converter 85 by giving a control signal ST including sampling timing information to the A / D converter 85.

  More specifically, in the reception period, the control unit 72 controls the switch 82 to connect the band pass filter 81 and the low noise amplifier 83. At this time, the control unit 72 controls the switch 79 to connect the oscillator 74 and the branch circuit 73, and the control unit 72 controls the switch 87 to connect the branch circuit 73 and the quadrature demodulator 84. To do.

  As a result, the local signal having the frequency f 1 generated by the oscillator 74 is output to the branch circuit 73. The radio signal having the frequency f 1 received by the array antenna unit 11 is output to the low noise amplifier 83 via the band pass filter 81 and the switch 82. The quadrature demodulator 84 performs quadrature demodulation by multiplying the radio signal received from the low noise amplifier 83 by the local signal received from the oscillator 74 via the branch circuit 73 and the switch 87.

  In the transmission period, the control unit 72 controls the switch 79 to connect the quadrature modulator 75 and the branch circuit 73. At this time, the control unit 72 controls the switch 87 to connect the branch circuit 73 and the power amplifier 86. Further, the control unit 72 controls the switch 82 to connect the bandpass filter 81 and the power amplifier 86. Connecting.

  Thereby, the quadrature modulator 75 receives the I signal and Q signal indicating each information generated by the slave unit control information generation unit 76 and the local signal generated by the oscillator 74, and performs a quadrature modulation process. A slave unit control signal is generated and output to the branch circuit 73 via the switch 79. The slave unit control signal output to the branch circuit 73 is output from the antenna unit 11 via the switch 87, the power amplifier 86, the switch 82 and the band pass filter 81.

  FIG. 10 is a diagram showing a table stored in the RAM 62 shown in FIG. 8 in which the transmission area, the intrusion detection slave units 104a, 104b, 104c, and 104d are associated with the transmission period.

  The intrusion detection calculation unit 16 has the same configuration as the intrusion detection calculation unit 16 of the intrusion detection master device 101 of the intrusion detection system 201 according to Embodiment 1 shown in FIG. However, referring to FIG. 10, RAM 62 includes intrusion detection slave units 104a, 104b, 104c, and 104d, and transmission area for intrusion detection slave units 104a, 104b, 104c, and 104d, north area AN and west area AW. A table in which the east area AE and the south area AS are associated with the transmission periods T1, T2, T3, and T4 of the wireless signals transmitted by the intrusion detection slaves 104a, 104b, 104c, and 104d in advance. Remember.

  Based on the spatial feature P (t) calculated by the spatial feature calculator 61, the detector 63 in the intrusion detection calculator 16 monitors a human operation in the transmission area for each radio signal. Specifically, the detection unit 63 detects the occurrence of a human motion in the transmission area for each radio signal based on the spatial feature amount P (t).

  Here, as described above, the closer the spatial feature P (t) is to “1”, the closer the state of the transmission area at the observation time t is to the normal state where no intruder exists in the transmission area. For this reason, when the spatial feature amount P (t) is less than a predetermined threshold value, for example, “0.9”, the detection unit 63 causes human action in the transmission area, that is, a human has entered the transmission area. Judge that

  When detecting a human motion, the detection unit 63 refers to a table stored in the RAM 62 and identifies a transmission area in which the human motion is detected from the transmission period of the wireless signal in which the human motion is detected. . That is, the detection unit 63 specifies the location in the detection target area where the intruder is present.

(Intrusion detection slave unit)
FIG. 11 is a diagram showing a configuration of intrusion detection slave units 104a, 104b, 104c, and 104d of intrusion detection system 202 according to Embodiment 2 of the present invention. The intrusion detection slave units 104a, 104b, 104c, and 104d have the same configuration as that shown in FIG.

  Referring to FIG. 11, intrusion detection slave units 104a, 104b, 104c, and 104d include an antenna 31, a frequency setting unit 35, a band pass filter (BPF) 36, a switch 37, a transmission control unit 40, A low noise amplifier 65, an orthogonal demodulator 66, an A / D converter (ADC) 67, a slave unit control information extraction unit 68, an oscillator 69, a power amplifier 70, and a distributor 80 are provided.

  The antenna 31 receives the radio signal having the frequency f1 transmitted from the intrusion detection master device 103.

  The band pass filter 36 attenuates a component outside a predetermined frequency band among the frequency components of the radio signal having the frequency f <b> 1 received by the antenna 31.

  The low noise amplifier 65 amplifies and outputs the radio signal that has passed through the band pass filter 36. The quadrature demodulator 66 multiplies the radio signal received from the low noise amplifier 65 by the oscillation signal received from the oscillator 69 via the distributor 80, thereby orthogonally demodulating the signal received from the low noise amplifier 65, for example. The signals are converted into baseband I and Q signals and output to the A / D converter 67.

  The A / D converter 67 converts the I signal and Q signal received from the quadrature demodulator 66 into digital signals of n bits (n is a natural number of 2 or more), respectively, and outputs the digital signals to the slave unit control information extraction unit 68.

  Slave unit control information extraction unit 68 detects a preamble included in the signal received from A / D converter 67, and extracts and extracts synchronization information, order information, transmission period information, and frequency information based on the detected preamble. Each piece of information is output to the transmission control unit 40.

  The transmission control unit 40 switches the connection of the switch 37 by outputting a switch switching signal SWE to the switch 37 using the synchronization information, the order information, and the transmission period information. Further, the transmission control unit 40 controls the presence or absence of signal output by the power amplifier 70 by giving the output control signal CV3 to the power amplifier 70 using the synchronization information, the order information, and the transmission period information. The transmission control unit 40 instructs the frequency setting unit 35 to set a frequency based on the frequency information.

  Specifically, in the reception period, the transmission control unit 40 controls the switch 37 to connect the band pass filter 36 and the low noise amplifier 65. As a result, the radio signal from the intrusion detection master device 103 received by the antenna 31 is output to the low noise amplifier 65 via the bandpass filter 36 and the switch 37. The radio signal amplified by the low noise amplifier 65 is output to the quadrature demodulator 66. Then, the I signal and the Q signal converted by the quadrature demodulator 66 are converted into a digital signal by the A / D converter 67, output to the child device control information extraction unit 68, and extracted by the child device control information extraction unit 68. Each piece of information is output to the transmission control unit 40.

  In the transmission period, the frequency setting unit 35 sets the frequency of the oscillation signal generated by the oscillator 69 in accordance with an instruction from the transmission control unit 40. The oscillator 69 generates a radio signal that is an oscillation signal set by the frequency setting unit 35 and outputs the radio signal to the distributor 80. Distributor 80 outputs the oscillation signal received from oscillator 69 to power amplifier 70 and quadrature demodulator 66.

  Then, the transmission control unit 40 controls the power amplifier 70 and the switch 37 based on the information received from the slave unit control information extraction unit 68, and is transmitted from the intrusion detection slave units 104a, 104b, 104c, and 104d. The transmission period of each radio signal is determined. Specifically, the transmission control unit 40 controls the switch 37 to connect the band-pass filter 36 and the power amplifier 70 so that a radio signal is output from the power amplifier 70 during the transmission period of its own intrusion detection slave unit. The output of the radio signal from the power amplifier 70 is stopped outside the transmission period.

  As a result, the radio signal that is the oscillation signal output to the power amplifier 70 is output to the antenna 31 via the switch 37 and the bandpass filter 36 during the transmission period set by the intrusion detection master device 103, and the antenna 31. To the intrusion detection master unit 103.

[Operation]
Next, an operation when the intrusion detection system 202 according to the second embodiment of the present invention performs intrusion detection will be described.

  FIG. 12 is a sequence diagram defining an operation procedure when the intrusion detection system 202 according to the second embodiment of the present invention performs an intrusion detection operation, and FIG. 13 is an intrusion detection according to the second embodiment of the present invention. It is a figure which shows the relationship of transmission / reception of the radio signal by the main | base station 103 for intrusion detection of the system 202, and the subunit | mobile_unit 104a, 104b, 104c, 104d for intrusion detection.

  The intrusion detection master device 103 and the intrusion detection slave devices 104a, 104b, 104c, and 104d in the intrusion detection system 202 read and execute a program including each step of the sequence from a memory (not shown). This program can be installed externally. The installed program is distributed in a state stored in a recording medium, for example.

  Referring to FIGS. 12 and 13, first, intrusion detection master device 103 transmits a radio signal of frequency f1 to intrusion detection slave devices 104a, 104b, 104c, and 104d (step S31).

  Next, intrusion detection slave units 104 a, 104 b, 104 c, and 104 d receive a radio signal of frequency f 1 that is a slave unit control signal from intrusion detection master unit 103. Then, the slave unit control information extraction unit 68 of the slave unit for intrusion detection 104a, 104b, 104c, 104d detects the slave unit control signal from the preamble included in the received radio signal, and synchronizes following the preamble in the slave unit control signal. By detecting information, that is, a unique word, a reference time is acquired and synchronized with the intrusion detection master unit 103. Furthermore, the subunit | mobile_unit control information extraction part 68 extracts frequency information, order information, and transmission period information (step S32).

  Here, as shown in FIG. 13, for example, the order information is data in which the IDs of the intrusion detection slave units 104a, 104b, 104c, and 104d are arranged in this order. The transmission period information is data in which transmission periods T1, T2, T3, and T4 are arranged in this order. The frequency information is data indicating the frequency f1.

  Next, each frequency setting unit 35 of the intrusion detection slave units 104a, 104b, 104c, and 104d sets the frequency f1 of the radio signal. Then, each of the oscillators 69 of the intrusion detection slave units 104a, 104b, 104c, and 104d generates a radio signal that is an oscillation signal of the frequency f1 set by the frequency setting unit 35 in synchronization with the intrusion detection master unit 103. (Step S33).

  Next, each transmission control unit 40 of the intrusion detection slave unit 104a, 104b, 104c, 104d controls the power amplifier 70 and the switch 37 to control the transmission period of the radio signal of its own intrusion detection slave unit. . Thereby, specifically, the following processing is performed.

  First, the intrusion detection slave unit 104a transmits a radio signal having the frequency f1 to the intrusion detection master unit 103 (step S34). Then, intrusion detection master device 103 performs reception processing of a radio signal from intrusion detection slave device 104a in transmission period T1 (step S35).

  Next, after the end of the transmission period T1 of the intrusion detection slave unit 104a, the intrusion detection slave unit 104b transmits a radio signal having the frequency f1 to the intrusion detection master unit 103 (step S36). Then, intrusion detection master device 103 performs reception processing of a radio signal from intrusion detection slave device 104b in transmission period T2 (step S37).

  Next, after the transmission period T2 of the intrusion detection slave unit 104b ends, the intrusion detection slave unit 104c transmits a radio signal having the frequency f1 to the intrusion detection master unit 103 (step S38). Then, intrusion detection master device 103 performs reception processing of a radio signal from intrusion detection slave device 104c in transmission period T3 (step S39).

  Next, after the transmission period T3 of the intrusion detection slave device 104c ends, the intrusion detection slave device 104d transmits a radio signal having the frequency f1 to the intrusion detection master device 103 (step S40). Then, intrusion detection master device 103 performs reception processing of a radio signal from intrusion detection slave device 104d in transmission period T4 (step S41).

  In the intrusion detection system 202 according to Embodiment 2 of the present invention, time division transmission of radio signals from the intrusion detection master unit 103 and the intrusion detection slave units 104a, 104b, 104c, and 104d is repeated.

  Next, the spatial feature value calculation unit 61 of the intrusion detection master device 103 calculates a spatial feature value for each radio signal from the intrusion detection slave devices 104a, 104b, 104c, and 104d (step S42). Then, the detection unit 63 of the intrusion detection master device 103 performs intrusion detection based on the spatial feature amount.

  Next, the detection unit 63 refers to the table stored in the RAM 62 and identifies the transmission area in which the human motion is detected from the transmission period of the wireless signal in which the human motion is detected. That is, it is specified in which location in the detection target area the intruder is present (step S43).

  Next, the alarm unit 64 transmits a signal notifying that a human motion has been detected and a transmission area in which the human motion has been detected to a security company or the like (step S44).

  As described above, in the intrusion detection system 202 according to the second embodiment of the present invention, the wireless signal transmission area transmitted by the intrusion detection slave units 104a, 104b, 104c, and 104d is the installation position of the intrusion detection master unit 103. And intrusion detection slave units 104a, 104b, 104c, and 104d are different from each other. Intrusion detection slave units 104a, 104b, 104c, and 104d transmit radio signals so that their transmission periods do not overlap each other. The intrusion detection master device 103 receives the radio signals transmitted from the intrusion detection slave devices 104a, 104b, 104c, and 104d, and based on the received radio signals, sets the spatial feature amount for each radio signal. Based on the calculated spatial feature amount, the human motion in the transmission area corresponding to the radio signal is monitored.

  With such a configuration, the wireless signal transmission area can be specified from the transmission period of the wireless signal used for monitoring human movements, and therefore where intruders exist in the detection target area. Can be identified.

  In addition, the intrusion detection slave unit 104 and the intrusion detection slave units 104a, 104b, 104c, and 104d are configured to have different transmission periods for the transmission wireless signals of the intrusion detection slave units 104a, 104b, 104c, and 104d. Can be set to the same frequency, an intrusion detection system can be easily constructed.

  Further, as described above, in intrusion detection system 202 according to Embodiment 2 of the present invention, intrusion detection master device 103 has intrusion detection slave devices 104a, 104b, 104c, and 104d synchronized with intrusion detection master device 103. Synchronization information indicating a reference time for transmission, order information indicating the order in which the intrusion detection slave units 104a, 104b, 104c, and 104d transmit wireless signals, and transmission period information indicating the length of the transmission period The slave unit control signal is transmitted to the intrusion detection slave units 104a, 104b, 104c, and 104d. Then, the intrusion detection slave units 104a, 104b, 104c, and 104d receive the slave unit control signals and determine their transmission periods.

  As described above, the intrusion detection master unit 103 includes the information necessary for determining the transmission period in the slave unit control signal and transmits it to the intrusion detection slave units 104a, 104b, 104c, and 104d. The wireless signal transmission periods of the intrusion detection slave units 104a, 104b, 104c, and 104d can be easily determined without individually setting the detection slave units 104a, 104b, 104c, and 104d.

  Intrusion detection slave unit 104a, 104b, 104c, 104d is configured such that intrusion detection master unit 103 transmits a slave unit control signal including a plurality of information to intrusion detection slave units 104a, 104b, 104c, 104d. The intrusion detection slave units 104a, 104b, 104c, and 104d can be made to perform various transmission operations only by setting the intrusion detection master unit 103 without performing the above setting.

  In the intrusion detection system 202 according to the second embodiment of the present invention, the detection unit 63 of the intrusion detection master device 103 is configured to detect a human intrusion into the transmission area as an occurrence of a human action in the transmission area. However, the present invention is not limited to this. The detection unit 63 of the intrusion detection master device 103 in the intrusion detection system 202 is similar to the detection unit 63 of the intrusion detection master device 101 of the intrusion detection system 201 according to Embodiment 1 of the present invention described above in the transmission area. It may be configured to detect the start of a human action existing in the transmission area as the occurrence of a human action.

(Modification 1)
Hereinafter, Modification 1 of Embodiment 2 will be described with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals and description thereof will not be repeated.

  In the first modification of the second embodiment, a case will be described in which repetitive information is included in a radio signal that is a slave device control signal transmitted from the intrusion detection master device (monitoring master device) 103.

[Configuration and basic operation]
FIG. 14 is a diagram showing information included in the slave device control signal transmitted from the intrusion detection master device 103 of the intrusion detection system 202 according to the first modification of the second embodiment of the present invention.

  Referring to FIG. 14, in Modification 1, slave unit control information generation unit 76 in intrusion detection master unit 103 shown in FIG. 8 includes synchronization information composed of a preamble and a unique word (UW), and order information. In addition to the transmission period information and the frequency information, the intrusion detection slave units (monitoring slave units) 104a, 104b, 104c, and 104d repeat number information indicating the number of times of repeating the transmission of the radio signal. Generate. The repetition number information is data indicating information of “3 times”, for example.

  That is, intrusion detection master device 103 transmits a slave device control signal including preamble, synchronization information, order information, transmission period information, frequency information, and repetition count information to intrusion detection slave devices 104a, 104b, 104c, and 104d. To do.

  In the intrusion detection slave units 104a, 104b, 104c, and 104d shown in FIG. 11, the slave unit control information extraction unit 68 extracts synchronization information, order information, transmission period information, frequency information, and repetition count information, and performs transmission control. To the unit 40.

  The transmission control unit 40 repeats the setting of the transmission period for the number of times indicated in the repetition number information. As a result, the intrusion detection slave units 104a, 104b, 104c, and 104d that have received the slave unit control signal transmit the radio signal the number of times indicated in the repeat count information.

[Operation]
FIG. 15 shows the relationship between transmission and reception of radio signals by intrusion detection master unit 103 and intrusion detection slave units 104a, 104b, 104c, and 104d of intrusion detection system 202 according to Modification 1 of Embodiment 2 of the present invention. FIG.

  Referring to FIG. 15, first, intrusion detection master device 103 transmits a radio signal of frequency f1 to intrusion detection slave devices 104a, 104b, 104c, and 104d (step S31 shown in FIG. 12).

  Next, intrusion detection slave units 104a, 104b, 104c, and 104d extract slave unit control information (step S32 shown in FIG. 12) and generate an oscillation signal (step S33 shown in FIG. 12).

  Next, intrusion detection slave units 104a, 104b, 104c, and 104d transmit radio signals of frequency f1 so that their transmission periods do not overlap (steps S34, S36, S38, and S40 shown in FIG. 12). . Then, intrusion detection master device 103 performs reception processing of each radio signal (steps S35, S37, S39, and S41 shown in FIG. 12).

  Next, the base unit 103 for intrusion detection calculates, for each radio signal, a spatial feature amount (step S42 shown in FIG. 12), intrusion detection (step S43 shown in FIG. 12), and transmission of an alarm signal (FIG. 12). Step S44) shown in FIG.

  At this time, since the slave unit control signal transmitted from the intrusion detection master unit 103 includes “3 times”, the intrusion detection slave units 104a, 104b, 104c, and 104d transmit the radio signal. The operation is performed twice more. That is, the operations from step S34 to step S44 are repeated a total of three times.

  Here, when the intrusion detection master unit 103 and the intrusion detection slave units 104a, 104b, 104c, and 104d transmit and receive radio signals having the same frequency f1 in a time-sharing manner, the intrusion detection master unit 103 detects the intrusion detection. The intrusion detection slave units 104a, 104b, 104c, and 104d cannot transmit radio signals during the period in which the slave unit control signals are transmitted to the slave units 104a, 104b, 104c, and 104d.

  However, with the configuration as described above, the number of transmissions of the slave control signal from the intrusion detection master unit 103 to the intrusion detection slave units 104a, 104b, 104c, 104d is set to the intrusion detection slave unit 104a, 104b, 104c, This can be reduced relative to the number of transmissions of the wireless signal from 104d.

  For this reason, it is possible to lengthen the period during which human motion can be detected by increasing the transmission period during which the intrusion detection slave units 104a, 104b, 104c, and 104d transmit wireless signals, thereby suppressing undetection. be able to. In addition, by increasing the transmission period during which the intrusion detection slave units 104a, 104b, 104c, and 104d transmit radio signals, the sample data acquisition period for calculating the spatial feature amount can be extended, so that the accuracy is high. Detection can be performed.

  Since other configurations and operations are the same as those of intrusion detection system 202 according to Embodiment 2, detailed description thereof will not be repeated here.

(Modification 2)
Hereinafter, a second modification of the second embodiment will be described with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals and description thereof will not be repeated.

  In the second embodiment described above, the intrusion detection master device 103 generates a slave device control signal including synchronization information, and the intrusion detection slave devices 104a, 104b, 104c, and 104d store each information included in the slave device control signal. The case of extracting has been described. On the other hand, in the second modification of the second embodiment, intrusion detection slave units (monitoring slave units) 106a, 106b, 106c, and 106d themselves generate a synchronization signal.

[Configuration and basic operation]
(Master device for intrusion detection)
FIG. 16 is a diagram illustrating a configuration of the intrusion detection master device 105 of the intrusion detection system 202 according to the second modification of the second embodiment.

  Referring to FIG. 16, intrusion detection master unit (monitoring master unit) 105 is compared with intrusion detection master unit 103 according to the second embodiment shown in FIG. The control information generator 76 and the switch 79 are not provided.

  The control unit 72 controls the switch 82 to connect the band pass filter 81 and the low noise amplifier 83 during the reception period. At this time, the control unit 72 controls the switch 87 to connect the branch circuit 73 and the quadrature demodulator 84. Thereby, the quadrature demodulator 84 performs quadrature demodulation by multiplying the radio signal received from the low noise amplifier 83 by the local signal received from the oscillator 74 via the branch circuit 73 and the switch 87.

  Further, A / D converter 85 has n bits (n is a natural number of 2 or more) of the I signal and Q signal received from quadrature demodulator 84 at the sampling timing based on control signal ST provided from control unit 72. The digital signal is converted and output to the intrusion detection calculation unit 16.

  The control unit 72 controls the switch 87 to connect the branch circuit 73 and the power amplifier 86 during the transmission period. At this time, the control unit 72 controls the switch 82 to connect the band pass filter 81 and the power amplifier 86.

  As a result, the radio signal that is the oscillation signal of the frequency f1 generated by the oscillator 74 is output to the branch circuit 73 and output to the antenna unit 11 via the switch 87, the power amplifier 86, the switch 82, and the band pass filter 81. The antenna unit 11 outputs the intrusion detection slave units 106a, 106b, 106c, and 106d.

(Intrusion detection slave unit)
FIG. 17 is a diagram illustrating a configuration of intrusion detection slave units 106a, 106b, 106c, and 106d of the intrusion detection system 202 according to the second modification of the second embodiment. The intrusion detection slave units 106a, 106b, 106c, and 106d have the same configuration as that shown in FIG.

  Referring to FIG. 17, intrusion detection slave units 106a, 106b, 106c, and 106d include an antenna 31, a synchronization signal generation unit 33, a transmission unit 34, a band pass filter (BPF) 36, a switch 37, A branch circuit 38, a detector (DET) 39, and a transmission control unit 40 are provided.

  Here, the synchronization signal generation unit 33 shown in FIG. 17 has substantially the same configuration as the synchronization signal generation unit 33 according to the first embodiment shown in FIG. 4, but the synchronization signal generation unit 33 shown in FIG. The synchronization signal generator 33 shown in FIG. 17 includes a 1 / N frequency divider circuit 46 while the N1 frequency divider circuit 41 is included. 17 has substantially the same configuration as that of transmission unit 34 according to the first embodiment shown in FIG. 4, but transmission unit 34 shown in FIG. 4 includes 1 / N2 frequency divider circuit 51. On the other hand, the transmission unit 34 shown in FIG. 17 includes a 1 / N frequency dividing circuit 90. Both the 1 / N frequency dividing circuit 46 and the 1 / N frequency dividing circuit 90 divide the radio signal by 1 / N.

  The branch circuit 38 branches the radio signal that has passed through the bandpass filter 36 to the 1 / N frequency divider 46 of the synchronization signal generator 33 and the detector 39 and outputs the result.

  The synchronization signal generation unit 33 has the same configuration as that of the synchronization signal generation unit 33 of the intrusion detection slave unit 102 of the intrusion detection system 201 according to the first embodiment shown in FIG. 4, and the intrusion detection slave units 106a and 106b. , 106c and 106d generate a synchronization signal so that the wireless signal is transmitted in synchronization with the intrusion detection master unit 105.

  The transmission unit 34 has the same configuration as the transmission unit 34 of the intrusion detection slave device 102 of the intrusion detection system 201 according to the first embodiment shown in FIG. 4, and the synchronization signal generated by the synchronization signal generation unit 33 is added to the synchronization signal. Based on this, an oscillation signal having the frequency f1 set by the frequency setting unit 35 and synchronized with the radio signal having the frequency f1 received from the intrusion detection master unit 105 is generated and transmitted.

  The detector 39 detects the radio signal received from the branch circuit 38 and outputs the detection signal DS to the transmission control unit 40.

  The transmission control unit 40 uses the timing at which the detection signal DS received from the detector 39 is received as a reference time, based on the transmission timing set for each of the intrusion detection slave units 106a, 106b, 106c, and 106d, from the power amplifier 56. The signal output and switching of the switch 37 are controlled in the same manner as the transmission control unit 40 of the intrusion detection slave units 104a, 104b, 104c, and 104d of the intrusion detection system 202 according to the second embodiment shown in FIG.

[Operation]
Next, an operation when the intrusion detection system 202 according to the second modification of the second embodiment performs intrusion detection will be described.

  FIG. 18 is a sequence diagram that defines an operation procedure when the intrusion detection system 202 according to the second modification of the second embodiment performs an intrusion detection operation.

  Referring to FIG. 18, first, intrusion detection master device 105 transmits a radio signal of frequency f1 to intrusion detection slave devices 106a, 106b, 106c, and 106d (step S51).

Next, each synchronization signal generator 33 of intrusion detection slave units 106a, 106b, 106c, and 106d receives a radio signal of frequency f1 from intrusion detection master unit 105 and generates a synchronization signal of frequency _fREF (step). S52).

  Next, each transmission unit 34 of intrusion detection slave units 106a, 106b, 106c, and 106d receives the synchronization signal generated by synchronization signal generation unit 33 and generates a radio signal that is an oscillation signal of frequency f1 ( Step S53).

  The generation of the synchronization signal (step S52) and the generation of the oscillation signal (step S53) are performed by the intrusion detection slave units 106a, 106b, 106c, and 106d, respectively.

  Next, the transmission control units 40 of the intrusion detection slave units 106a, 106b, 106c, and 106d control the power amplifier 56 and the switch 37 based on the detection signal DS. As a result, intrusion detection slave units 106a, 106b, 106c, and 106d transmit radio signals of frequency f1 so that the transmission periods do not overlap each other (from step S54 to step S61).

  Next, the spatial feature value calculation unit 61 of the intrusion detection master device 103 calculates a spatial feature value for each radio signal (step S62), and the detection unit 63 of the intrusion detection master device 103 determines the spatial feature value. Intrusion detection.

  Next, the detection unit 63 refers to the table stored in the RAM 62 and identifies the transmission area in which the human motion is detected from the transmission period of the radio signal in which the human motion is detected (step S63).

  Next, the alarm unit 64 transmits a signal notifying that a human motion has been detected and a transmission area in which the human motion has been detected to a security company or the like (step S64).

  Thus, according to the intrusion detection system 202 according to the second modification of the second embodiment, similarly to the second embodiment, the transmission area of the wireless signal is determined from the transmission period of the wireless signal in which a human action is detected. Since it can be specified, it is possible to specify where intruders exist in the detection target area.

  Further, according to the intrusion detection system 202 according to the second modification of the second embodiment, similarly to the second embodiment, the transmission periods of the transmission radio signals of the intrusion detection slave units 106a, 106b, 106c, and 106d are different. With this configuration, since the radio signal can be set to the same frequency in the intrusion detection master unit 105 and the intrusion detection slave units 106a, 106b, 106c, and 106d, an intrusion detection system can be easily constructed.

  Since other configurations and operations are the same as those of intrusion detection system 202 according to Embodiment 2, detailed description thereof will not be repeated here.

(Embodiment 3)
The third embodiment of the present invention will be described below with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals and description thereof will not be repeated.

  The intrusion detection system (monitoring system) 203 according to the third embodiment of the present invention uses a radio signal obtained by performing spread spectrum with invasion detection slave units (monitoring slave units) 108a, 108b, 108c, and 108d using different spreading codes. To be sent. FIG. 19 is a diagram showing a usage image of the intrusion detection system 203 according to Embodiment 3 of the present invention.

  Referring to FIG. 19, as intrusion detection system 203, as intrusion detection system 201 according to Embodiment 1 shown in FIG. 2, an intrusion detection master device (monitoring master device) for receiving a radio signal 107 and intrusion detection slaves 108a, 108b, 108c, 108d for transmitting radio signals are installed in a detection target area, for example, a room.

  The intrusion detection system 203 receives a radio signal transmitted from the intrusion detection slave units 108a, 108b, 108c, 108d within a predetermined interval or continuously by the intrusion detection master unit 107, and based on the received radio signal. By performing signal processing in this manner, for example, the presence / absence of a human operation that has entered the room is detected as a monitoring of the human operation.

  Intrusion detection slave units 108a, 108b, 108c, and 108d have radio signal transmission areas including the installation position of intrusion detection master unit 107, and radio signal transmission areas are intrusion detection slave units 108a, 108b, and 108c. , 108d are installed to be different from each other. In the example shown in FIG. 17, the radio signal transmission area of the intrusion detection slave unit 108a is the indoor north area AN, and the radio signal transmission area of the intrusion detection slave unit 108b is the indoor west area AW. The radio signal transmission area of the intrusion detection slave unit 108c is the indoor east area AE, and the radio signal transmission area of the intrusion detection slave unit 108d is the indoor south side area AS.

[Configuration and basic operation]
(Master device for intrusion detection)
FIG. 20 is a diagram showing a configuration of intrusion detection master device 107 of intrusion detection system 203 according to Embodiment 3 of the present invention. Referring to FIG. 20, intrusion detection master device 107 includes array antenna unit 11, receiving unit 12, branch circuit 13, intrusion detection calculation unit 16, branch circuit 17, oscillator 18, and oscillator 77. And a control unit 78.

  The array antenna unit 11 and the reception unit 12 have the same configuration as the array antenna unit 11 and the reception unit 12 of the intrusion detection master device 101 of the intrusion detection system 201 according to Embodiment 1 shown in FIG. However, the receiving unit 12 further includes a correlator 26 in addition to a duplexer 21, a low noise amplifier 22, an orthogonal demodulator 23, an A / D converter (ADC) 24, and a power amplifier 25. .

  The array antenna unit 11 receives a radio signal having a frequency f1 from the intrusion detection slave units 108a, 108b, 108c, and 108d. This radio signal is subjected to spread spectrum processing using the spread code PNn set individually by the intrusion detection slave units 108a, 108b, 108c, and 108d. The array antenna unit 11 outputs the received radio signal to the correlator 26 via the duplexer 21 and the low noise amplifier 22.

  The control unit 78 stores in advance a spreading code PNn used for spread spectrum for each radio signal transmitted from the intrusion detecting slave units 108a, 108b, 108c, and 108d. Then, the controller 78 outputs the stored spreading code PNn to the correlator 26.

  Correlator 26 receives spreading code PNn from control unit 78, performs despreading processing on each radio signal transmitted from intrusion detecting slave units 108a, 108b, 108c, and 108d, and orthogonalizes the processed signals. Output to the demodulator 23.

  The oscillator 77 generates a local signal having a frequency f 1 and outputs the local signal to the branch circuit 13. The branch circuit 13 outputs the local signal of the frequency f1 to the quadrature demodulator 23 of the four sets RX1, RX2, RX3, RX4 of the reception unit 12.

  The quadrature demodulator 23 performs quadrature demodulation by multiplying the signal received from the correlator 26 by the local signal having the frequency f1 generated by the oscillator 77, and converts the signal into a baseband I signal and Q signal. Output to the A / D converter 24.

  The A / D converter 24 converts the I signal and the Q signal received from the quadrature demodulator 23 into n-bit (n is a natural number of 2 or more) digital signals, and outputs them to the intrusion detection calculation unit 16.

  FIG. 21 shows a transmission area, intrusion detection slave units 108a, 108b, 108c, and 108d stored in the RAM 62 shown in FIG. 20, a spreading code PNn used for a radio signal transmitted by each intrusion detection slave unit, It is a figure which shows the table which matched.

  The intrusion detection calculation unit 16 has the same configuration as the intrusion detection calculation unit 16 of the intrusion detection master device 101 of the intrusion detection system 201 according to Embodiment 1 shown in FIG. However, referring to FIG. 21, in RAM 62, intrusion detection slave units 108a, 108b, 108c, 108d and the north area AN, which is the transmission area of these intrusion detection slave units 108a, 108b, 108c, 108d, The west-side area AW, the east-side area AE, and the south-side area AS are associated with the spreading codes PN1, PN2, PN3, and PN4 used for the radio signals transmitted by the intrusion detection slave units 108a, 108b, 108c, and 108d. The table is stored in advance.

  In the intrusion detection calculation unit 16, the detection unit 63 monitors a human operation in the transmission area for each radio signal based on the spatial feature value P (t) calculated by the spatial feature value calculation unit 61. Specifically, the detection unit 63 detects the occurrence of a human motion in the transmission area for each radio signal based on the spatial feature amount P (t).

  Here, as described above, the closer the spatial feature P (t) is to “1”, the closer the state of the transmission area at the observation time t is to the normal state where no intruder exists in the transmission area. For this reason, when the spatial feature amount P (t) is less than a predetermined threshold value, for example, “0.9”, the detection unit 63 causes human action in the transmission area, that is, a human has entered the transmission area. Judge that

  When the detection unit 63 detects a human operation, the transmission unit refers to a table stored in the RAM 62 and detects a human operation from a spreading code used for a radio signal in which the human operation is detected. Is identified. That is, it is specified in which location in the detection target area the intruder exists.

  The oscillator 18 generates an oscillation signal having a frequency f0 and outputs the oscillation signal to the branch circuit 17. The branch circuit 17 outputs a radio signal that is an oscillation signal of the frequency f0 to the power amplifiers 25 of the four sets RX1, RX2, RX3, RX4 of the reception unit 12.

  The power amplifier 25 amplifies the radio signal having the frequency f 0 received from the oscillator 18 via the branch circuit 17 and outputs the amplified signal to the duplexer 21. Further, the duplexer 21 outputs the radio signal received from the power amplifier 25 to the corresponding antenna in the array antenna unit 11, and the radio signal having the frequency f0 is transmitted from the antenna.

(Intrusion detection slave unit)
FIG. 22 is a diagram showing a configuration of intrusion detection slave units 108a, 108b, 108c, and 108d of intrusion detection system 203 according to Embodiment 3 of the present invention. The intrusion detection slave units 108a, 108b, 108c, and 108d have the same configuration.

  Referring to FIG. 22, intrusion detection slave units 108 a, 108 b, 108 c, and 108 d include an antenna 31, a duplexer 32, a synchronization signal generation unit 33, a transmission unit 34, and a spreading code setting unit 60. It is equipped with.

  The antenna 31, the duplexer 32, and the synchronization signal generation unit 33 are the antenna 31, the duplexer 32, and the synchronization signal of the intrusion detection slave units 102a, 102b, 102c, and 102d of the intrusion detection system 201 according to Embodiment 1 shown in FIG. The configuration is the same as that of the generation unit 33.

The transmission unit 34 includes a 1 / N2 frequency divider 51, a 1 / R frequency divider 52, a phase comparison circuit (PD) 53, a band pass filter (BPF) 54, an oscillator 55, a power amplifier 56, In addition, a signal processing unit 57, a quadrature modulator 58, and a spreader 59 are further included. Based on the synchronization signal of frequency f _REF generated by the synchronization signal generation unit 33, the transmission unit 34 generates an oscillation signal synchronized with the radio signal of frequency f 0 received from the intrusion detection master unit 107. Furthermore, the transmission unit 34 performs spread spectrum processing on the radio signal generated using the oscillation signal using the spread code PNn set by the spread code setting unit 60, and transmits the radio signal subjected to spread spectrum processing. .

Specifically, the 1 / N2 frequency dividing circuit 51 divides the radio signal having the frequency f1 into 1 / N2. The 1 / R frequency dividing circuit 52 _divides the synchronization signal of the frequency f _REF generated by the synchronization signal generation unit 33 into 1 / R. The phase comparison circuit 53 detects the phase difference between the radio signal received from the 1 / N2 frequency divider circuit 51 and the radio signal received from the 1 / R frequency divider circuit 52, and outputs a phase difference signal indicating the detection result.

  Bandpass filter 54 attenuates a component outside a predetermined frequency band among the frequency components of the phase difference signal received from phase comparison circuit 53.

  The oscillator 55 generates an oscillation signal having a frequency f1 based on the phase difference signal that has passed through the band-pass filter 54.

  The signal processing unit 57 generates baseband I and Q signals and outputs them to the quadrature modulator 58. The quadrature modulator 58 multiplies the I signal and Q signal received from the signal processing unit 57 by the oscillation signal having the frequency f1 received from the oscillator 55 to generate a radio signal by quadrature modulation of the I signal and Q signal. And output to the diffuser 59.

  The spreader 59 performs spread spectrum on the radio signal received from the quadrature modulator 58 using the spread code PNn set by the spread code setting unit 60.

  Here, each spreading code setting unit 60 of intrusion detecting slave units 108a, 108b, 108c, and 108d stores different spreading codes PNn in advance. For example, the spreading code setting unit 60 of the intrusion detecting slave unit 108a stores the spreading code PN1, the spreading code setting unit 60 of the intrusion detecting slave unit 108b stores the spreading code PN2, and the spreading of the intrusion detecting slave unit 108c. Code setting unit 60 stores spreading code PN3, and spreading code setting unit 60 of intrusion detection slave unit 108d stores spreading code PN4.

  The power amplifier 56 amplifies the radio signal received from the spreader 59 and outputs it to the antenna 31 via the duplexer 32.

[Operation]
Next, an operation when the intrusion detection system 203 according to the third embodiment of the present invention performs intrusion detection will be described.

  FIG. 23 is a sequence diagram defining an operation procedure when the intrusion detection system 203 according to the third embodiment of the present invention performs an intrusion detection operation, and FIG. 24 is an intrusion detection according to the third embodiment of the present invention. It is a figure which shows the relationship of the transmission / reception of the radio signal by the main | base station 107 for intrusion detection of the system 203, and the subunit | mobile_unit 108a, 108b, 108c, 108d for intrusion detection.

  The intrusion detection master unit 107 and the intrusion detection slave units 108a, 108b, 108c, and 108d in the intrusion detection system 203 read out a program including each step of the sequence from a memory (not shown) and execute it. This program can be installed externally. The installed program is distributed in a state stored in a recording medium, for example.

  Referring to FIG. 23, first, intrusion detection master device 107 transmits a radio signal of frequency f0 generated by oscillator 18 to intrusion detection slave devices 108a, 108b, 108c, and 108d (step S71). Referring to FIG. 24, the radio signal of frequency f0 is continuously transmitted from intrusion detection master device 107 while intrusion detection is performed by intrusion detection system 203.

Next, each synchronization signal generator 33 of intrusion detection slave units 108a, 108b, 108c, and 108d receives a radio signal of frequency f0 from intrusion detection master unit 107 and generates a synchronization signal of frequency _fREF (step). S72).

  Next, the oscillator 55 of each transmission unit 34 of the intrusion detection slave units 108a, 108b, 108c, and 108d receives the synchronization signal generated by the synchronization signal generation unit 33, and generates an oscillation signal of the frequency f1 (step). S73).

  Next, the spreader 59 of the transmission unit 34 performs a spread spectrum process using the spreading code PNn set by the spreading code setting unit 60 (step S74).

  Each of the intrusion detection slave units 108a, 108b, 108c, and 108d performs the generation of the synchronization signal (step S72), the generation of the oscillation signal (step S73), and the spread spectrum process (step S74). Further, the spread code PNn has frequencies PN1, PN2, PN3, and PN4 in the intrusion detection slave units 108a, 108b, 108c, and 108d, respectively.

  Next, each of the intrusion detection slave units 108a, 108b, 108c, and 108d transmits the radio signal having the spectrum spread frequency f1 to the intrusion detection master unit 107 (step S54). The intrusion detection slave units 108a, 108b, 108c, and 108d are spread spectrum while the intrusion detection system 203 performs the intrusion detection, similarly to the radio signal having the frequency f0 transmitted from the intrusion detection master unit 107. The radio signal having the frequency f1 is continuously transmitted.

  Next, the intrusion detection master device 107 receives radio signals from the intrusion detection slave devices 108a, 108b, 108c, and 108d (step S76).

  Next, correlator 26 of intrusion detection master unit 107 receives spreading code PNn from control unit 78 and performs despreading processing on the radio signals received from intrusion detection slave units 108a, 108b, 108c, and 108d. This is performed (step S77). The spreading codes PNn, that is, PN1, PN2, PN3, and PN4 correspond to the spreading codes PNn that the intrusion detecting slave units 108a, 108b, 108c, and 108d use for spectrum spreading, that is, PN1, PN2, PN3, and PN4, respectively. Yes. As a result, intrusion detection master device 107 can obtain signals before diffusion processing in intrusion detection slave devices 108a, 108b, 108c, and 108d, respectively.

  Next, the spatial feature value calculation unit 61 of the intrusion detection master device 107 calculates a spatial feature value for each radio signal from each intrusion detection slave device (step S78).

  Next, the transmission area in which the detection unit 63 of the intrusion detection master device 107 detects the human action from the spread code used for the radio signal in which the human action is detected with reference to the table stored in the RAM 62. Is identified. That is, it is specified in which location in the detection target area the intruder is present (step S79).

  Next, when there is an area in which a human motion is detected among the detection target areas, the alarm unit 64 sends a signal indicating that the human motion has been detected and a signal notifying the area in which the human motion has been detected. (Step S80).

  As described above, in the intrusion detection system 203 according to Embodiment 3 of the present invention, the transmission area of the radio signal transmitted by the intrusion detection slave units 108a, 108b, 108c, and 108d is the installation position of the intrusion detection master unit 101. And intrusion detection slave units 108a, 108b, 108c, 108d are different from each other. Intrusion detection slave units 108a, 108b, 108c, and 108d transmit radio signals that have been spectrum-spread with different spreading codes. The intrusion detection master device 107 receives the radio signals transmitted from the intrusion detection slave devices 108a, 108b, 108c, and 108d, and based on the received radio signals, sets the spatial feature amount for each radio signal. Based on the calculated spatial feature amount, the human motion in the transmission area corresponding to the radio signal is monitored.

  With such a configuration, the transmission area of the wireless signal can be identified from the spreading code used for the wireless signal used for monitoring human movements, so an intruder exists in any location within the detection target area. You can specify what to do.

  Further, the intrusion detection slave units 108a, 108b, 108c, and 108d have different configurations of the spread codes used for spectrum spreading, and, for example, wireless signals are transmitted from the intrusion detection slave units 108a, 108b, 108c, and 108d in different periods. Such complicated control as above, or setting for transmitting radio signals having different frequencies for each of the intrusion detection slave units 108a, 108b, 108c, and 108d becomes unnecessary.

  Note that in the intrusion detection system 203 according to Embodiment 3 of the present invention, the detection unit 63 of the intrusion detection master unit 107 detects a human intrusion into the transmission area as the occurrence of a human action in the transmission area. However, the present invention is not limited to this. The detection unit 63 of the intrusion detection base unit 107 in the intrusion detection system 203 is similar to the detection unit 63 of the intrusion detection base unit 101 of the intrusion detection system 201 according to Embodiment 1 of the present invention described above in the transmission area. It may be configured to detect the start of a human action existing in the transmission area as the occurrence of a human action.

(Embodiment 4)
The present embodiment relates to a monitoring system in which the purpose of use is changed as compared with the monitoring system according to the first to third embodiments described above. The contents other than those described below are the same as those of the monitoring system according to the first embodiment, that is, the intrusion detection system 201.

  In the intrusion detection system 201 according to the first embodiment of the present invention, the detection unit 63 of the intrusion detection master unit 101 is based on the spatial feature amount P (t) calculated by the spatial feature amount calculation unit 61. As the monitoring of human movements in H., the occurrence of human movements in the transmission area, for example, the entry of humans into the transmission area or the start of human actions existing in the transmission area is detected.

  On the other hand, in the monitoring system (monitoring system) 204 according to the fourth embodiment of the present invention, as a monitoring process for monitoring a human operation in the transmission area, there is no human being in the transmission area, specifically, no monitoring target person. Perform watch-over processing to detect motion or minor motion. This transmission area is, for example, an area in which one or a plurality of humans normally perform an action such as walking.

  More specifically, the watching system 204 is similar to the intrusion detection system 201 according to the first embodiment of the present invention shown in FIG. 1, and the watching master device (monitoring master device) 101 and the monitoring slave device (monitoring) Cordless handset) 102a, 102b, 102c, 102d.

  Similar to the spatial feature value calculator 61 of the intrusion detection master device 101 in the intrusion detection system 201 according to Embodiment 1 of the present invention, the spatial feature value calculator 61 of the watchdog master device 101 has the initial vector vno, A spatial feature P (t) at the observation time t is calculated using the eigenvector vob (t) at the observation time t.

  The detection unit 63 detects based on the spatial feature value P (t) calculated by the spatial feature value calculation unit 61 that there is no or little human action in the transmission area. Specifically, for example, the detection unit 63 monitors whether or not there is a person who has not moved for a predetermined time due to an abnormality such as a heart attack in the transmission area.

  Here, the initial vector vno used as a comparison criterion in the watching system 204 is an eigenvector when no person is present in the transmission area, for example.

  Therefore, as the spatial feature P (t) is smaller than “1”, the state of the predetermined area at the observation time t is closer to the normal state where one or more people are moving.

  For this reason, the detection unit 63 determines that there is no or little human action in the transmission area when the state in which the spatial feature amount P (t) is equal to or greater than a predetermined threshold continues for a predetermined time or longer.

  For example, assuming that the predetermined threshold value is “0.9”, the detection unit 63 has a normal state in which there is human action in the transmission area when the spatial feature P (t) is smaller than “0.9”. It is judged that. On the other hand, when the state where the spatial feature amount P (t) is “0.9” or more continues for a predetermined time or longer, the detection unit 63 determines that there is no human action or a small abnormal state in the transmission area. .

  Since other configurations and operations are the same as those of intrusion detection system 201 according to Embodiment 1 of the present invention described above, detailed description will not be repeated here.

  That is, in the monitoring system 204 according to Embodiment 4 of the present invention, the monitoring slave units 102a, 102b, 102c, and 102d transmit radio signals having different frequencies. The watching master device 101 receives the radio signals transmitted from the watching slave devices 102a, 102b, 102c, and 102d, and calculates a spatial feature amount for each radio signal based on the received radio signals. Based on the calculated spatial feature amount, human motion in the transmission area corresponding to the radio signal is monitored, that is, it is detected that there is no or little human motion in the transmission area.

  With such a configuration, since the radio signal transmission area can be specified from the frequency of the radio signal used for monitoring human movements, it is possible to determine where in the monitored area the monitoring target person exists. This makes it possible to identify the person in the transmission area.

  In the monitoring system 204 according to the fourth embodiment of the present invention, it has been described that the contents other than those described above are the same as the intrusion detection system 201 according to the first embodiment of the present invention. It may be the same as the intrusion detection system 202 according to the second embodiment.

  That is, in the watching system 204 according to Embodiment 4 of the present invention, the monitoring slave units 102a, 102b, 102c, and 102d transmit radio signals so that the transmission periods do not overlap with each other, and the monitoring master unit 101 The wireless signals transmitted from the monitoring slave devices 102a, 102b, 102c, and 102d are received, the spatial feature amount is calculated for each wireless signal based on the received wireless signals, and based on the calculated spatial feature amount. It may be configured to monitor a human operation in a transmission area corresponding to a radio signal.

  Further, the watching system 204 according to the fourth embodiment of the present invention may be the same as the intrusion detection system 203 according to the third embodiment of the present invention except for the contents described above.

  That is, in the monitoring system 204 according to Embodiment 4 of the present invention, the monitoring slave units 102a, 102b, 102c, and 102d transmit radio signals that have been spread spectrum with different spreading codes, and the monitoring master unit 101 The wireless signals transmitted from the monitoring slave units 102a, 102b, 102c, and 102d are received, the spatial feature amount is calculated for each wireless signal based on the received wireless signals, and the calculated spatial feature amount is calculated. Thus, it may be configured to monitor human movement in a transmission area corresponding to a radio signal.

  In addition, the watching system 204 according to the fourth embodiment of the present invention is configured to perform a binary determination of the presence or absence of human motion, but is not limited to this. It may be configured to output an index indicating the level of possibility of no operation or low operation.

  In addition, the intrusion detection system according to Embodiment 1 to Embodiment 3 of the present invention and the watching system according to Embodiment 4 of the present invention are configured to use eigenvalues and eigenvectors as spatial feature amounts. However, the present invention is not limited to this. The intrusion detection system according to Embodiment 1 to Embodiment 3 of the present invention and the monitoring system according to Embodiment 4 of the present invention are not limited to eigenvalues or eigenvectors, and are described in Non-Patent Document 1. A configuration using other spatial feature quantities such as a delay profile may be used.

  In the intrusion detection system according to Embodiment 1 to Embodiment 3 of the present invention and the monitoring system according to Embodiment 4 of the present invention, the receiver is an array type radio wave sensor. However, other types of radio wave sensors may be used.

  The above embodiment should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

DESCRIPTION OF SYMBOLS 11 Array antenna part 12,71 Reception part 13,17 Branch circuit 14a, 14b Oscillator 15 Control part 16 Intrusion detection calculating part (calculating part)
18 Oscillator 19, 37 Switch 21, 32 Duplexer (Duplex)
22, 65 Low noise amplifier 23, 66 Quadrature demodulator 24, 67 A / D converter (ADC)
25, 56 Power amplifier 26 Correlator 31 Antenna 33 Synchronization signal generator 34 Transmitter 35 Frequency setting unit 36, 44 Band pass filter (BPF)
38,73 Branch circuit 39 Detector (DET)
40 Transmission Control Unit 41 1 / N1 Frequency Dividing Circuit 51 1 / N2 Frequency Dividing Circuit 42, 52 1 / R Frequency Dividing Circuit 43, 53 Phase Comparison Circuit (PD)
45,55 Oscillator 46,90 1 / N frequency divider 54,81 Band pass filter (BPF)
57 Signal Processing Unit 58 Orthogonal Modulator 59 Spreader 60 Spreading Code Setting Unit 61 Spatial Feature Quantity Calculation Unit 62 RAM
63 Detection unit 64 Alarm unit 68 Slave unit control information extraction unit 69, 74, 77 Oscillator 70, 86 Power amplifier 72, 78 Control unit 75 Quadrature modulator 76 Slave unit control information generation unit 79, 82, 87 Switch 80 Distributor 83 Low noise amplifier 84 Quadrature demodulator 85 A / D converter (ADC)
101, 103, 105, 107 Intrusion detection parent device (monitoring parent device), watching parent device (monitoring parent device)
102a, 102b, 102c, 102d Intrusion detection slave unit (monitoring slave unit), watching slave unit (monitoring slave unit)
104a, 104b, 104c, 104d Intrusion detection slave unit (monitoring slave unit)
106a, 106b, 106c, 106d Intrusion detection slave unit (monitoring slave unit)
108a, 108b, 108c, 108d Intrusion detection slave unit (monitoring slave unit)
201, 202, 203 Intrusion detection system (monitoring system)
204 Monitoring system (monitoring system)

Claims (15)

A monitoring system comprising a plurality of monitoring slave units for transmitting radio signals, and a monitoring master unit,
The wireless signal transmission area includes an installation position of the monitoring master unit, and is different from each other among the plurality of monitoring slave units,
The plurality of monitoring slave units transmit radio signals having different frequencies, or radio signals that have been spread spectrum with different spreading codes,
The monitoring master unit receives the radio signals transmitted from the plurality of monitoring slave units, and calculates a spatial feature amount for each radio signal based on the received radio signals. A monitoring system that monitors a human operation in the transmission area corresponding to the radio signal based on the spatial feature. A monitoring system comprising a plurality of monitoring slave units for transmitting radio signals, and a monitoring master unit,
The wireless signal transmission area includes an installation position of the monitoring master unit, and is different from each other among the plurality of monitoring slave units,
The plurality of monitoring slave units transmit radio signals so that transmission periods do not overlap each other,
The monitoring master unit receives the radio signals transmitted from the plurality of monitoring slave units, and calculates a spatial feature amount for each radio signal based on the received radio signals. A monitoring system that monitors a human operation in the transmission area corresponding to the radio signal based on the spatial feature. The monitoring master unit includes information for synchronizing the plurality of monitoring slave units with the monitoring master unit, information indicating an order in which the plurality of monitoring slave units transmit radio signals, and the transmission period. Transmitting a slave unit control signal including information indicating the length of the plurality of slave units for monitoring,
The monitoring system according to claim 2, wherein each of the plurality of monitoring slave units determines the transmission period based on the slave unit control signal received from the monitoring master unit. The monitoring master unit transmits the slave control signal to the plurality of monitoring slave units at a timing other than the transmission period in which the plurality of monitoring slave units transmit radio signals,
The slave unit control signal further includes repetition number information indicating the number of times the plurality of monitoring slave units repeat transmission of radio signals,
The monitoring system according to claim 3, wherein the plurality of monitoring slave units receive the slave unit control signal and transmit a radio signal by the number of repetitions indicated by the repetition number information.   The monitoring system according to any one of claims 1 to 4, wherein the plurality of monitoring slave units transmit radio signals in synchronization with the monitoring master unit.   The monitoring system according to any one of claims 1 to 5, wherein the monitoring base unit detects that there is no or little human action in the transmission area. The monitoring slave unit in a monitoring system comprising a plurality of monitoring slave units for transmitting radio signals, and a monitoring master unit,
The wireless signal transmission area includes an installation position of the monitoring master unit, and is different from each other among the plurality of monitoring slave units,
A frequency setting unit for setting the frequency of the radio signal;
A transmission unit for transmitting a radio signal having a frequency set by the frequency setting unit,
The frequency setting unit is configured such that the monitoring master unit receives the radio signals transmitted from the plurality of monitoring slave units, and sets a spatial feature amount for each radio signal based on the received radio signals. Monitoring, wherein different frequencies are set between the plurality of monitoring slave units so that a human operation in the transmission area corresponding to the wireless signal can be monitored based on the calculated spatial feature amount Child machine. The monitoring slave unit in a monitoring system comprising a plurality of monitoring slave units for transmitting radio signals, and a monitoring master unit,
The wireless signal transmission area includes an installation position of the monitoring master unit, and is different from each other among the plurality of monitoring slave units,
A transmitter for transmitting a radio signal;
A transmission control unit for controlling the transmission unit,
The transmission control unit receives the radio signal transmitted from the plurality of monitoring slave units by the monitoring master unit, and determines a spatial feature amount for each radio signal based on each received radio signal. And the radio signal transmission periods overlap each other between the plurality of monitoring slave units so that the human motion in the transmission area corresponding to the radio signal can be monitored based on the calculated spatial feature amount. A monitoring slave unit that controls the transmission unit so as not to become. The monitoring slave unit in a monitoring system comprising a plurality of monitoring slave units for transmitting radio signals, and a monitoring master unit,
The wireless signal transmission area includes an installation position of the monitoring master unit, and is different from each other among the plurality of monitoring slave units,
A spreading code setting unit for setting a spreading code used for the radio signal;
A transmission unit for transmitting a radio signal spectrum-spread with the spreading code set by the spreading code setting unit,
In the spreading code setting unit, the monitoring master unit receives the radio signals transmitted from the plurality of monitoring slave units, and based on the received radio signals, the spatial feature amount is determined as the radio signal. A different spreading code is set between the plurality of monitoring slave units so that it is possible to monitor a human operation in the transmission area corresponding to the radio signal based on the calculated spatial feature amount. , Monitoring handset. The monitoring master unit in a monitoring system comprising a plurality of monitoring slave units for transmitting radio signals and a monitoring master unit,
The wireless signal transmission area includes an installation position of the monitoring master unit, and is different from each other among the plurality of monitoring slave units,
The radio signals having different frequencies between the plurality of monitoring slave units or the radio signals spectrum-spread with different spreading codes in the plurality of monitoring slave units are received from the plurality of monitoring slave units. A receiver for
An operation for calculating a spatial feature amount for each wireless signal based on each received wireless signal, and monitoring a human action in the transmission area corresponding to the wireless signal based on the calculated spatial feature amount And a monitoring master unit. The monitoring master unit in a monitoring system comprising a plurality of monitoring slave units for transmitting radio signals and a monitoring master unit,
The wireless signal transmission area includes an installation position of the monitoring master unit, and is different from each other among the plurality of monitoring slave units,
A receiving unit for receiving the radio signals transmitted from the plurality of monitoring slave units so that the transmission periods do not overlap each other;
An operation for calculating a spatial feature amount for each wireless signal based on each received wireless signal, and monitoring a human action in the transmission area corresponding to the wireless signal based on the calculated spatial feature amount And a monitoring master unit. A monitoring method in a monitoring system comprising a plurality of monitoring slave units for transmitting radio signals, and a monitoring master unit,
The plurality of monitoring slave units include installation positions of the monitoring master units, and are transmitted to different transmission areas among the plurality of monitoring slave units with radio signals having different frequencies or different spreading codes. Transmitting a spread spectrum radio signal;
The monitoring master unit receives the radio signals transmitted from the plurality of monitoring slave units, and calculates a spatial feature amount for each radio signal based on the received radio signals;
The monitoring method includes a step of monitoring the human movement in the transmission area corresponding to the radio signal based on the calculated spatial feature amount. A monitoring method in a monitoring system comprising a plurality of monitoring slave units for transmitting radio signals, and a monitoring master unit,
A step of transmitting a radio signal so that the plurality of monitoring slave units include an installation position of the monitoring master unit and the transmission periods of the plurality of monitoring slave units are different from each other so that transmission periods do not overlap each other; When,
The monitoring master unit receives the radio signals transmitted from the plurality of monitoring slave units, and calculates a spatial feature amount for each radio signal based on the received radio signals;
The monitoring method includes a step of monitoring the human movement in the transmission area corresponding to the radio signal based on the calculated spatial feature amount. A monitoring program used in a monitoring system comprising a plurality of monitoring slave units for transmitting radio signals and a monitoring master unit, the computer comprising:
The plurality of monitoring slave units include installation positions of the monitoring master units, and are transmitted to different transmission areas among the plurality of monitoring slave units with radio signals having different frequencies or different spreading codes. Transmitting a spread spectrum radio signal;
The monitoring master unit receives the radio signals transmitted from the plurality of monitoring slave units, and calculates a spatial feature amount for each radio signal based on the received radio signals;
A monitoring program for causing the monitoring base unit to execute a step of monitoring human movements in the transmission area corresponding to the radio signal based on the calculated spatial feature amount. A monitoring program used in a monitoring system comprising a plurality of monitoring slave units for transmitting radio signals and a monitoring master unit, the computer comprising:
A step of transmitting a radio signal so that the plurality of monitoring slave units include an installation position of the monitoring master unit and the transmission periods of the plurality of monitoring slave units are different from each other so that transmission periods do not overlap each other; When,
The monitoring master unit receives the radio signals transmitted from the plurality of monitoring slave units, and calculates a spatial feature amount for each radio signal based on the received radio signals;
A monitoring program for causing the monitoring base unit to execute a step of monitoring human movements in the transmission area corresponding to the radio signal based on the calculated spatial feature amount.

Images