JP2012238266A - Trespass detecting device and trespass detecting system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a trespass detecting device and a trespass detecting system which can reduce necessary cost for responding to a use environment and flexibly respond to the use environment in a configuration for detecting trespass of a person with a radio wave in a predetermined area.SOLUTION: A trespass detecting device 101 detects a person's movement in the predetermined area where a plurality of communication devices establish communication by transmitting/receiving a radio signal. The trespass detecting device 101 comprises: a receiving section 11 for receiving the radio signal; a spatial feature amount calculating section 12 for calculating a spatial feature amount in the predetermined area on the basis of the radio signal received by the receiving section 11; and a detecting section 13 for detecting the person's movement in the predetermined area on the basis of the spatial feature amount calculated by the spatial feature amount calculating section 12.

Description

  The present invention relates to an intrusion detection device and an intrusion detection system, and more particularly, to an intrusion detection device and an intrusion detection system that detect human actions using spatial feature amounts.

  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

  In principle, the radio wave used in the event detection apparatus described in Patent Literature 1 is not limited in type such as frequency and bandwidth. On the other hand, depending on the environment where transmitters and receivers are installed as intrusion detection devices, there may be restrictions on the types and strengths of radio waves that can be handled. In such cases, both transmitters and receivers Must be adapted to the usage environment. In addition, in order to perform intrusion detection, it is necessary to continue to transmit radio waves within a certain interval from the transmitter, and when such a transmitter is installed, there may be restrictions imposed by laws and regulations regarding radio transmission. is there.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to reduce the cost required to cope with the use environment in a configuration in which a human intrusion in a predetermined area is detected using radio waves. An intrusion detection apparatus and an intrusion detection system that can flexibly cope with the use environment.

  (1) In order to solve the above-described problem, an intrusion detection apparatus according to an aspect of the present invention is for detecting a human action in a predetermined area where a plurality of communication apparatuses perform communication by transmitting and receiving radio signals. An intrusion detection device, a receiving unit for receiving the wireless signal, and a spatial feature amount calculating unit for calculating a spatial feature amount in the predetermined area based on the wireless signal received by the receiving unit; A detecting unit for detecting a human motion in the predetermined area based on the spatial feature amount calculated by the spatial feature amount calculating unit.

  With such a configuration, it is possible to satisfactorily detect human intrusion in a predetermined area while effectively using an existing device arranged in the predetermined area and reducing the installation cost of the device. Moreover, regarding radio wave transmission, it is possible to satisfy the restrictions imposed by laws and regulations by using, as a transmitter, a communication device that transmits radio signals including useful data within a certain interval or continuously.

  (2) Preferably, the target device does not require a receiving side device other than the target device among the plurality of communication devices to transmit the wireless signal including response information to the target wireless signal to the target device. Communication data that conforms to a communication protocol, and generates communication data to be transmitted to a plurality of the communication devices, and transmits the communication data to the reception side device via a wired line. The reception side device is the target device The communication data received from is converted into a radio signal and transferred to another communication device, and the receiving unit receives the radio signal transferred from the receiving device.

  In this way, the communication data for transmission to a plurality of communication devices is temporarily transmitted from the target device to the reception side device via the wired line, so that the reception side device, not the target device, becomes a radio wave transmission source for intrusion detection. Therefore, the intrusion detection device may simply use the received radio wave for signal processing for the detection operation without determining the transmission source of the received radio wave. That is, it is possible to reliably prevent erroneous detection in the intrusion detection device without performing special settings such as non-transmission of response information and non-transfer of communication data in the reception side device. In addition, the restriction on the distance between the target device and the receiving device can be eliminated. In addition, a configuration for level determination and a configuration for acquiring transmission timing are not required, and software change is not required, and erroneous detection in the intrusion detection device can be prevented with a simple configuration. That is, the intrusion detection function can be realized and erroneous detection can be prevented without changing each device in the existing communication system.

  (3) Preferably, the target device does not require a receiving side device other than the target device among the plurality of communication devices to transmit the wireless signal including response information to the target wireless signal to the target device. Communication data that conforms to a communication protocol, generates communication data to be transmitted to a plurality of the communication devices, transmits the target wireless signal including the communication data, and the reception-side device receives from the target device The communication data included in the target wireless signal is set to be converted into a wireless signal and not transferred to the other communication device.

  With such a configuration, radio waves can be transmitted only to the target device while the intrusion detection device is performing the detection operation. That is, a configuration for level determination and a configuration for acquiring transmission timing are not necessary, and it is possible to reliably prevent erroneous detection in the intrusion detection device only by changing the software of the reception side device.

  (4) More preferably, the intrusion detection device further determines whether or not the wireless signal received by the receiving unit is a target wireless signal transmitted from a target device among the plurality of communication devices. A determination unit is provided for determining, and the spatial feature amount calculation unit calculates the spatial feature amount based on the target radio signal determined by the determination unit.

  With such a configuration, it is possible to identify whether there has been a change in radio wave propagation due to human intrusion or a change in radio wave propagation due to switching of the transmission source. It is possible to accurately calculate the feature amount and prevent erroneous detection.

  (5) More preferably, the intrusion detection device is arranged in the vicinity of a receiving side device other than the target device among the plurality of communication devices or integrated with the receiving side device, and the determination unit is The target radio signal is determined based on the level of the radio signal received by the receiving unit.

  With such a configuration, it is possible to prevent erroneous detection with a simple configuration without changing each device in the existing communication system.

  (6) More preferably, the determination unit determines that the radio signal having a level that is greater than or equal to a first threshold and less than a second threshold that is greater than the first threshold is the target radio signal.

  With such a configuration, a state where a wireless signal is received from the target device, a state where a wireless signal is received from a receiving side device other than the target device among a plurality of communication devices, and a wireless signal is not received It is possible to appropriately determine the no-input state and accurately determine the target wireless signal.

  (7) More preferably, the determination unit acquires transmission timing information indicating a timing at which a receiving side device other than the target device among the plurality of communication devices transmits the radio signal from the receiving side device, The target radio signal is determined based on the acquired transmission timing information.

  With such a configuration, the intrusion detection device can recognize the timing at which the receiving device transmits radio waves. For this reason, in the intrusion detection device, it is easy to exclude the received radio wave from the signal processing target for the detection operation during the period in which the receiving device is transmitting the radio wave. That is, only radio waves transmitted according to a predetermined communication method from the target device can be used for the detection operation. Therefore, it is possible to satisfactorily detect human intrusion in the predetermined area while effectively using the existing device arranged in the predetermined area and reducing the installation cost of the device. Moreover, regarding radio wave transmission, it is possible to satisfy the restrictions imposed by laws and regulations by using, as a transmitter, a communication device that transmits radio signals including useful data within a certain interval or continuously. Furthermore, it is possible to identify whether there has been a change in radio wave propagation due to human intrusion or a change in radio wave propagation due to switching of the transmission source, thereby preventing erroneous detection. In addition, radio waves transmitted from the target device can be more reliably determined.

  (8) More preferably, the determination unit acquires, as the transmission timing information, a level of an analog signal that is converted into the radio signal to be transmitted in the reception-side apparatus, and the target radio is based on the acquired level. Determine the signal.

  With such a configuration, the intrusion detection device can recognize the timing at which the receiving device transmits radio waves with a simple circuit.

  (9) Preferably, a receiving-side device other than the target device among the plurality of communication devices does not transmit the wireless signal including response information to the target wireless signal received from the target device to the target device. And the target device needs to transmit response information for the communication data to the target device by a data processing unit for processing the communication data included in the target wireless signal received by the receiving side device. The communication data is generated according to a communication protocol without any data.

  With such a configuration, radio waves can be transmitted only to the target device while the intrusion detection device is performing the detection operation. That is, a configuration for level determination and a configuration for acquiring transmission timing are not necessary, and it is possible to reliably prevent erroneous detection in the intrusion detection device only by changing the software of the reception side device.

  (10) Preferably, the target device transmits data indicating the captured video included in the target wireless signal.

  A device that transmits video is a device that continuously transmits data. That is, the detection performance can be improved by using an appropriate device as a transmitter. In addition, the intrusion detection device transmits a detection result to a video receiving terminal or a target device having a video storage function, and adopts a configuration in which video recorded by the target device is recorded on a recording device both before and after detection. As a result, it is possible to realize a function of recording the intruder. Further, when the shooting area can be changed by turning the target device, it is also possible to perform shooting and recording after the target device is automatically turned to the security priority point.

  (11) In order to solve the above problem, an intrusion detection system according to an aspect of the present invention includes a plurality of communication devices that perform communication by transmitting and receiving radio signals to and from each other in a predetermined area, and a human being in the predetermined area. An intrusion detection system comprising an intrusion detection device for detecting an operation, wherein the intrusion detection device is based on a reception unit for receiving the radio signal and the radio signal received by the reception unit. A spatial feature amount calculation unit for calculating a spatial feature amount in the predetermined area, and a detection unit for detecting a human motion in the predetermined area based on the spatial feature amount calculated by the spatial feature amount calculation unit Including.

  With such a configuration, it is possible to satisfactorily detect human intrusion in a predetermined area while effectively using an existing device arranged in the predetermined area and reducing the installation cost of the device. Moreover, regarding radio wave transmission, it is possible to satisfy the restrictions imposed by laws and regulations by using, as a transmitter, a communication device that transmits radio signals including useful data within a certain interval or continuously.

  According to the present invention, in a configuration for detecting human intrusion in a predetermined area using radio waves, it is possible to reduce the cost required to cope with the use environment and flexibly deal with the use environment.

It is a figure which shows the usage image of the intrusion detection apparatus which concerns on the 1st Embodiment of this invention. It is a figure which shows the structure of the intrusion detection system which concerns on the 1st Embodiment of this invention. It is a figure which shows the structure of the intrusion detection apparatus which concerns on the 1st Embodiment of this invention. It is a figure which shows the example of installation of each apparatus in the intrusion detection system which concerns on the 1st Embodiment of this invention. It is a figure which shows the structure of the receiver of the electromagnetic wave from the transmission source in FIG. 4 in detail. It is a figure which shows an example of the intensity | strength of the received radio wave in the intrusion detection apparatus which concerns on the 1st Embodiment of this invention. It is a functional block diagram of the intrusion detection apparatus which concerns on the 1st Embodiment of this invention. It is the flowchart which defined the operation | movement procedure at the time of the intrusion detection apparatus which concerns on the 1st Embodiment of this invention performing a detection operation. It is a figure which shows the structure of the intrusion detection apparatus and wireless LAN access point which concern on the 2nd Embodiment of this invention. It is a figure which shows an example of the specific structure for acquiring the transmission timing of the radio signal from a wireless LAN access point. It is a figure which shows an example of the received radio wave in the intrusion detection apparatus which concerns on the 3rd Embodiment of this invention. It is a figure which shows the delivery confirmation operation | movement in the wireless LAN communication between an IP camera and a wireless LAN access point. It is a figure which shows transmission of the video data in the modification of the intrusion detection system which concerns on the 3rd Embodiment of this invention. It is a figure which shows the structure of the intrusion detection system which concerns on the 4th Embodiment of this invention. It is a figure which shows the example of installation of each apparatus in the intrusion detection system which concerns on the 4th Embodiment of this invention.

  Hereinafter, embodiments 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.

<First Embodiment>
FIG. 1 is a diagram showing a usage image of the intrusion detection device according to the first embodiment of the present invention.

  Referring to FIG. 1, the intrusion detection device according to the first embodiment of the present invention functions as a moving object detection sensor. At least a pair of transmitters and receivers as intrusion detection devices are installed in a closed space, for example, a house, which is to be used as a warning area. The intrusion detection device receives a radio wave transmitted within a certain interval or continuously from the transmitter at the receiver and performs signal processing based on the received radio wave, thereby opening and closing the person and the door that has entered the room. Etc. are detected.

  For example, the intrusion detection device is an array type radio wave sensor, includes a plurality of receiving antenna elements, and realizes a moving object detection function using a change in radio wave propagation in a closed space. The radio waves used by the intrusion detection device are not limited in frequency and bandwidth in principle, but the types and strengths of radio waves that can be handled differ depending on the use environment.

[Configuration and basic operation]
FIG. 2 is a diagram showing the configuration of the intrusion detection system according to the first embodiment of the present invention.

  Referring to FIG. 2, intrusion detection system 301 is provided in a predetermined area such as a room, and includes intrusion detection device 101, IP camera (target device) 201, wireless LAN access point (reception side device) 202, video A receiving terminal 203. Note that a plurality of wireless LAN access points (AP) 202 may be provided in the intrusion detection system 301.

  The IP camera 201 captures, for example, the inside of the predetermined area, converts the video data indicating the captured image into a radio signal according to a predetermined wireless communication system, for example, a 2.4 GHz band wireless LAN system, and transmits the radio signal.

  The wireless LAN access point 202 converts the wireless signal received from the IP camera 201 into video data according to a predetermined wireless communication system, for example, a 2.4 GHz band wireless LAN system, and outputs the video data to the video receiving terminal 203.

  The video receiving terminal 203 displays and records video based on the video data received from the wireless LAN access point 202.

  The intrusion detection device 101 detects a human operation in an area where a plurality of communication devices such as the IP camera 201 and the wireless LAN access point 202 communicate by transmitting and receiving wireless signals.

  More specifically, the intrusion detection device 101 detects a human motion in the area based on the spatial feature amount indicating the state of the predetermined area. That is, the intrusion detection apparatus 101 monitors the state in the predetermined area based on the wave propagation properties such as reflection and diffraction. Specifically, the intrusion detection apparatus 101 detects human movements by monitoring arrival angle distributions calculated based on reception signals of a plurality of antennas provided in a predetermined area.

  In the intrusion detection system 301, the intrusion detection apparatus 101 performs a detection operation using radio waves of communication signals in accordance with a 2.4 GHz band wireless LAN system.

  In order for the intrusion detection apparatus 101 to perform the detection operation, it is necessary to transmit radio waves from the transmitter within a certain interval or continuously. The intrusion detection system 301 uses an IP camera 201 that transmits video as a radio wave transmission source as an application for continuously transmitting data.

  FIG. 3 is a diagram showing the configuration of the intrusion detection device according to the first embodiment of the present invention.

  Referring to FIG. 3, intrusion detection apparatus 101 includes an array antenna unit 21, an RF receiving unit 22, and a signal processing unit 23. The RF receiving unit 22 includes a high frequency amplifier 51 and a frequency down converter 52. The signal processing unit 23 includes an AD conversion unit 53, an array signal processing unit 54 as a calculation unit, and a detection result output unit 55.

  In the RF receiver 22, the high frequency amplifier 51 amplifies and outputs radio signals received by a plurality of antennas in the array antenna unit 21.

  The frequency down converter 52 down-converts the radio signal received from the high frequency amplifier 51 and outputs it to the signal processing unit 23.

  In the signal processing unit 23, the AD conversion unit 53 converts the signal received from the RF reception unit 22 into a digital signal.

  The array signal processing unit 54 calculates a spatial feature amount indicating the state of the predetermined area based on the digital signal received from the AD conversion unit 53, and detects a human motion in the predetermined area.

  The detection result output unit 55 outputs a detection result signal indicating the detection result by the array signal processing unit 54 to another device by Ethernet (registered trademark), USB (Universal Serial Bus), a contact signal, or the like.

  Here, the communication system of the wireless LAN is CSMA (Carrier Sense Multiple Access). That is, when two-way communication is performed between the IP camera 201 and the wireless LAN access point 202, radio waves are not transmitted from both at the same time.

  However, the radio wave transmission source may be switched from the IP camera 201 to the wireless LAN access point 202 while the intrusion detection apparatus 101 is performing signal processing for the detection operation. In this case, since the intrusion detection device 101 uses a change in radio wave propagation in the space for detection, whether the radio wave propagation has changed due to human intrusion or the radio wave propagation has changed due to switching of the transmission source. It is not possible to identify whether it has occurred, which may cause false detection.

  Therefore, the intrusion detection apparatus according to the first embodiment of the present invention solves the above problem by the following configuration.

  FIG. 4 is a diagram illustrating an installation example of each device in the intrusion detection system according to the first embodiment of the present invention. FIG. 5 is a diagram showing in detail the configuration of the receiver of the radio wave from the transmission source in FIG.

  Referring to FIGS. 4 and 5, IP camera 201 as a transmission source and wireless LAN access point 202 as a reception destination are arranged at two corners on a diagonal line of room R, respectively.

  The wireless LAN access point 202 outputs the video data from the IP camera 201 to the video receiving terminal 203.

  Intrusion detection apparatus 101 is arranged in the vicinity of wireless LAN access point 202 and outputs a signal indicating the result of the detection operation to video receiving terminal 203.

  FIG. 6 is a diagram showing an example of the intensity of the received radio wave in the intrusion detection device according to the first embodiment of the present invention.

  Referring to FIG. 6, by disposing each device in intrusion detection system 301 as shown in FIGS. 4 and 5, IP camera 201 and intrusion detection device 101 are separated from each other, and wireless LAN access point 202 and intrusion detection device are separated. 101 is close. As a result, in the intrusion detection device 101, the intensity of the radio wave transmitted from the IP camera 201 is reduced, and the intensity of the radio wave transmitted from the wireless LAN access point 202 is increased, thereby causing an obvious difference between the two radio waves. be able to.

  In the intrusion detection device according to the first embodiment of the present invention, the radio wave having a magnitude greater than a certain value, for example, amplitude, is not used for signal processing for the detection operation by utilizing the difference in radio wave intensity. This prevents false detection.

  FIG. 7 is a functional block diagram of the intrusion detection device according to the first embodiment of the present invention.

  With reference to FIG. 7, the intrusion detection apparatus 101 includes a reception unit 11, a spatial feature amount calculation unit 12, a detection unit 13, and a determination unit 14. The receiving unit 11 corresponds to the RF receiving unit 22 shown in FIG. The spatial feature amount calculation unit 12, the detection unit 13, and the determination unit 14 correspond to the signal processing unit 23 illustrated in FIG.

  The receiving unit 11 receives a radio signal from a communication device in the intrusion detection system 301.

  The spatial feature quantity calculation unit 12 calculates a spatial feature quantity in a predetermined area based on the level and arrival timing of the radio signal received by the reception unit 11. In other words, the spatial feature amount calculation unit 12 calculates a spatial feature amount indicating the state of the predetermined area for a predetermined area where a human motion is to be detected.

More specifically, the spatial feature amount calculation unit 12 extracts a spatial feature amount using the arrival angle distribution, for example, in the same manner as the configuration described in Patent Document 1. That is, the spatial feature quantity calculation unit 12 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)

  The detection unit 13 detects a human motion in a predetermined area based on the spatial feature amount P (t) calculated by the spatial feature amount calculation unit 12.

  Further, the determination unit 14 determines whether or not the wireless signal received by the reception unit 11 is a target wireless signal transmitted from the IP camera 201. For example, when the intrusion detection apparatus 101 is disposed in the vicinity of the wireless LAN access point 202, the determination unit 14 determines the target wireless signal based on the level of the wireless signal received by the reception unit 11. Then, the spatial feature value calculation unit 12 calculates a spatial feature value based on the target wireless signal determined by the determination unit 14.

  FIG. 8 is a flowchart defining an operation procedure when the intrusion detection device according to the first embodiment of the present invention performs a detection operation. The intrusion detection apparatus 101 reads out and executes each step of the flowchart 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. 8, first, the signal processing unit 23 acquires a down-converted signal from the RF receiving unit 22 as a received radio wave (step S1).

  Next, the signal processing unit 23 samples the received radio wave waveform by converting the down-converted signal into a digital signal. Specifically, if the determination of intrusion presence / absence is performed at a cycle of 100 milliseconds, for example, the signal processing unit 23 obtains the received radio wave waveform corresponding to the time obtained by subtracting the computation time for determining the presence / absence of intrusion from 100 milliseconds. The data shown is acquired using the AD converter 53 (step S2).

  Next, the signal processing unit 23 detects the amplitude of the received radio wave waveform based on the sampled data, and compares the detected amplitude with a predetermined no-signal threshold value. Then, when the amplitude of the received radio wave waveform is less than the no-signal threshold in the entire range of the sampling interval, the signal processing unit 23 indicates that the sampling interval is a no-signal interval in which no radio signal from the communication device exists. Judgment is made (YES in step S3), and the spatial feature value is not calculated for the sampling section.

  On the other hand, if there is a section where the amplitude of the received radio wave waveform is equal to or greater than the no-signal threshold in the sampling section, the signal processing unit 23 determines that a wireless signal from the communication device is present in the sampling section (step S3). NO), the amplitude of the received radio wave waveform is compared with a predetermined target signal threshold. Then, when there is an invalid signal portion where the amplitude of the received radio wave waveform is equal to or greater than the target signal threshold (YES in step S4), the signal processing unit 23 deletes the invalid signal portion (step S5).

  Next, the signal processing unit 23 determines whether or not the data remaining as the effective signal portion of the sampled data has a sufficient amount of information for calculation processing for determining whether or not there is an intrusion, and determines that it is sufficient. If so (YES in step S6), the spatial feature amount is calculated based on the data remaining as the effective signal part, human motion in a predetermined area is detected (step S7), and the detection result is output (step S7). S8).

  On the other hand, when the signal processing unit 23 determines that the data remaining as the effective signal portion of the sampled data is insufficient in the amount of information for calculation processing for intrusion presence / absence determination (NO in step S6). The spatial feature amount is not calculated for the sampling interval.

  Specifically, the signal processing unit 23 has sufficient information for the arithmetic processing for determining whether or not the data remaining as the effective signal portion is based on how much the effective signal portion occupies in the sampling data of one section. Determine whether it is a quantity. For example, if 50% of the sampling data for 100 milliseconds, that is, 50 milliseconds or more is an effective signal portion, it is determined that the amount of information is sufficient, and if it is less than 50%, the amount of information is insufficient. Judge. This percentage can be changed.

  By the way, depending on the environment where transmitters and receivers are installed as intrusion detection devices, there are cases where there are restrictions on the type and intensity of radio waves that can be handled. In such cases, both transmitters and receivers are used. It is necessary to adapt to the environment. In addition, in order to perform intrusion detection, it is necessary to continue to transmit radio waves within a certain interval from the transmitter, and when such a transmitter is installed, there may be restrictions imposed by laws and regulations regarding radio transmission. is there.

  On the other hand, in the intrusion detection device according to the first embodiment of the present invention, the reception unit 11 receives a radio signal from a communication device that communicates with another communication device by transmitting and receiving a radio signal. . The spatial feature quantity calculation unit 12 calculates a spatial feature quantity in a predetermined area based on the radio signal received by the reception unit 11. Then, the detection unit 13 detects a human motion in a predetermined area based on the spatial feature amount calculated by the spatial feature amount calculation unit 12.

  With such a configuration, it is possible to satisfactorily detect human intrusion in the detection target area while effectively reducing the installation cost of the apparatus by effectively using the existing device arranged in the detection target area. Moreover, regarding radio wave transmission, it is possible to satisfy the restrictions imposed by laws and regulations by using, as a transmitter, a communication device that transmits radio signals including useful data within a certain interval or continuously.

  In the intrusion detection device according to the first embodiment of the present invention, the determination unit 14 determines whether the wireless signal received by the receiving unit 11 is a target wireless signal transmitted from the IP camera 201. Determine. Then, the spatial feature value calculation unit 12 calculates a spatial feature value based on the target wireless signal determined by the determination unit 14.

  With such a configuration, it is possible to identify whether there has been a change in radio wave propagation due to human intrusion or a change in radio wave propagation due to switching of the transmission source. It is possible to accurately calculate the feature amount and prevent erroneous detection.

  In the intrusion detection device according to the first embodiment of the present invention, the determination unit 14 determines the target wireless signal based on the level of the wireless signal received by the reception unit 11.

  With such a configuration, it is possible to prevent erroneous detection with a simple configuration without changing each device in the existing wireless LAN system.

  In the intrusion detection device according to the first embodiment of the present invention, the determination unit 14 determines that the radio signal having a level that is greater than the no-signal threshold and less than the target signal threshold is greater than the no-signal threshold. Judge.

  With such a configuration, a state in which a radio signal is received from the target device, a state in which a radio signal is received from the receiving side device, and a no-input state in which no radio signal is received are appropriately determined, and the target radio The signal can be accurately determined.

  Moreover, in the intrusion detection apparatus according to the first embodiment of the present invention, the IP camera 201 transmits data indicating the captured video in the target wireless signal.

  An IP camera that transmits video is a device that continuously transmits data. That is, the detection performance can be improved by using an appropriate device as a transmitter. In addition, the intrusion detection apparatus transmits a detection result to a video receiving terminal or an IP camera having a video storage function, and adopts a configuration in which video captured by the IP camera is recorded on a recording device both before and after detection. As a result, it is possible to realize a function of recording the intruder. In addition, when the shooting area can be changed by turning the IP camera, shooting and recording can be performed after the IP camera is automatically turned to the security priority point.

  Note that the intrusion detection apparatus according to the first embodiment of the present invention does not require a state in which no radio wave is transmitted from the wireless LAN access point 202 in order to perform the detection operation. For example, by averaging the measurement results of a plurality of times of radio waves, it is possible to prevent erroneous detection even if some radio waves are transmitted from the wireless LAN access point 202.

  Moreover, although the intrusion detection apparatus according to the first embodiment of the present invention is configured to calculate the spatial feature amount in a predetermined area based on the radio signal from the IP camera 201, the present invention is not limited to this. Absent. Any device can be used as long as it communicates by transmitting and receiving wireless signals to and from other devices, not limited to IP cameras.

  In addition, the intrusion detection device according to the first exemplary embodiment of the present invention is configured to be arranged in the vicinity of the wireless LAN access point 202, but the present invention is not limited to this. It may be integrated.

  In the intrusion detection apparatus according to the first embodiment of the present invention, the eigenvector is used as the spatial feature quantity, but the present invention is not limited to this. Not only the eigenvector but also a configuration using other spatial features such as a delay profile described in Non-Patent Document 1 may be used.

  In the intrusion detection apparatus according to the first embodiment of the present invention, the one-dimensional feature value is used as the spatial feature value. However, the present invention is not limited to this. A configuration using a multidimensional feature value as the spatial feature value may be used. For example, the eigenvector itself can be used as the feature vector, or a delay profile as described in Non-Patent Document 1 can be used.

  Moreover, although the intrusion detection apparatus according to the first embodiment of the present invention is configured to perform a binary determination of the presence or absence of an intruder, the present invention is not limited to this. The structure which outputs the parameter | index which shows the level of intrusion possibility may be sufficient.

  Moreover, although the intrusion detection device according to the first embodiment of the present invention is an array type radio wave sensor, it may be another type of radio wave sensor.

  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.

<Second Embodiment>
The present embodiment relates to an intrusion detection apparatus that determines a radio wave transmission source by a method different from the intrusion detection apparatus according to the first embodiment. The contents other than those described below are the same as those of the intrusion detection apparatus according to the first embodiment.

  FIG. 9 is a diagram showing a configuration of an intrusion detection device and a wireless LAN access point according to the second embodiment of the present invention.

  Referring to FIG. 9, intrusion detection system 301 includes a wireless LAN access point 212 instead of wireless LAN access point 202.

  The wireless LAN access point 212 is obtained by integrating the wireless LAN access point 202 and the intrusion detection device 101. As a portion corresponding to the intrusion detection device 101, the array antenna unit 21, the RF reception unit 22, and signal processing are performed. Part 23. The wireless LAN access point 212 includes a wireless LAN access point unit 41 as a part corresponding to the wireless LAN access point 202. The wireless LAN access point unit 41 includes a communication antenna 31, a wireless LAN interface (I / F) 32, a communication control unit 33, a wired LAN interface (I / F) 34, and a plurality of LAN ports 35. .

  The wireless LAN interface 32 performs signal processing according to the 2.4 GHz band wireless LAN system on the wireless signal received by the communication antenna 31, and outputs an analog signal generated by this signal processing to the communication control unit 33.

  The communication control unit 33 converts the analog signal received from the wireless LAN interface 32 into a digital signal, and performs signal processing according to the 2.4 GHz band wireless LAN system on the converted digital signal. For example, the communication control unit 33 reproduces a packet including video data generated in the IP camera 201 by this signal processing, and outputs the packet to the wired LAN interface 34.

  The wired LAN interface 34 transmits the packet received from the communication control unit 33 to the video reception terminal 203 via the LAN port 35 in accordance with a predetermined communication method.

  The wired LAN interface 34 outputs a packet received from the video receiving terminal 203 via the LAN port 35 to the communication control unit 33.

  The communication control unit 33 performs signal processing according to the 2.4 GHz band wireless LAN system on the packet received from the wired LAN interface 34, converts the packet to an analog signal, and outputs the analog signal to the wireless LAN interface 32.

  The wireless LAN interface 32 converts the analog signal received from the communication control unit 33 into a wireless signal in accordance with a 2.4 GHz band wireless LAN communication method, and transmits it from the communication antenna 31.

  The signal processing unit 23 including the determination unit 14 illustrated in FIG. 7 determines whether or not the wireless signal received by the RF reception unit 22 is a target wireless signal transmitted from the IP camera 201. More specifically, the determination unit 14 acquires transmission timing information indicating the timing at which the wireless LAN access point unit 41 transmits a wireless signal from the wireless LAN access point unit 41, and based on the acquired transmission timing information, the target wireless signal Is determined.

  Specifically, the communication control unit 33 detects the occurrence of communication from the wireless LAN access point 202 to another communication device such as the IP camera 201, and transmits transmission timing information D1 indicating the transmission timing of the wireless signal associated with the communication. Is output to the signal processing unit 23.

  Based on the transmission timing information D1 received from the communication control unit 33, the signal processing unit 23 temporarily stops the signal processing for the detection operation and interrupts the detection operation.

  FIG. 10 is a diagram illustrating an example of a specific configuration for acquiring the transmission timing of a wireless signal from a wireless LAN access point.

  Referring to FIG. 10, determination unit 14 acquires the level of an analog signal converted into a radio signal to be transmitted at wireless LAN access point 202 as transmission timing information, and determines a target radio signal based on the acquired level. To do.

  More specifically, the wireless LAN access point 202 includes a coupler 45 and a determination circuit 46.

  The coupler 45 branches an analog signal output from the communication control unit 33 to the wireless LAN interface 32 and outputs the branched analog signal.

  The determination circuit 46 outputs a level determination signal indicating whether or not the level of the analog signal received from the coupler 45 is equal to or higher than a predetermined threshold value to the signal processing unit 23. For example, the level determination signal is set to a logical high level when the level of the analog signal is equal to or higher than the predetermined threshold, and is set to a logical low level when the level of the analog signal is lower than the predetermined threshold. Set to Note that the determination circuit 46 may have an integration circuit in order to prevent chattering of the level determination signal.

  When the determination signal received from the determination circuit 46 is at a logic high level, the signal processing unit 23 stops signal processing for the detection operation and interrupts the detection operation.

  As described above, the intrusion detection device and the wireless LAN access point are integrated, so that the intrusion detection device can recognize the timing at which the wireless LAN access point transmits radio waves. For this reason, in the intrusion detection device, it is easy to exclude the received radio wave during the period during which the wireless LAN access point is transmitting radio waves from the target of signal processing for the detection operation. That is, only radio waves transmitted from the IP camera 201 according to the wireless LAN method can be used for the detection operation.

  Therefore, in the intrusion detection device according to the second embodiment of the present invention, the existing device arranged in the detection target area is effectively used as in the intrusion detection device according to the first embodiment of the present invention. Thus, it is possible to satisfactorily detect human intrusion in the detection target area while reducing the installation cost of the apparatus. Moreover, regarding radio wave transmission, it is possible to satisfy the restrictions imposed by laws and regulations by using, as a transmitter, a communication device that transmits radio signals including useful data within a certain interval or continuously. Furthermore, it is possible to identify whether there has been a change in radio wave propagation due to human intrusion or a change in radio wave propagation due to switching of the transmission source, thereby preventing erroneous detection.

  Further, in the intrusion detection device according to the second embodiment of the present invention, the radio wave transmitted from the IP camera 201 is more reliably discriminated as compared with the intrusion detection device according to the first embodiment of the present invention. be able to.

  Further, in the intrusion detection device according to the second exemplary embodiment of the present invention, the determination unit 14 acquires the level of an analog signal converted into a wireless signal to be transmitted at the wireless LAN access point 202 as transmission timing information, The target radio signal is determined based on the acquired level.

  With such a configuration, the intrusion detection device can recognize the timing at which the wireless LAN access point transmits radio waves with a simple circuit.

  Although the intrusion detection device according to the second embodiment of the present invention is configured to be integrated with the wireless LAN access point, the present invention is not limited to this. Any configuration may be used as long as the intrusion detection device can acquire the timing, for example, the wireless LAN access point outputs a wired signal indicating the timing at which radio waves are transmitted from the wireless LAN access point to the intrusion detection device. In this case, it is not necessary to place the intrusion detection device 101 in the vicinity of the wireless LAN access point 202, and the restriction on the distance between the two can be eliminated.

  Since other configurations and operations are the same as those of the intrusion detection device according to the first embodiment, detailed description thereof will not be repeated here.

  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.

<Third Embodiment>
The present embodiment relates to an intrusion detection device that prevents false detection by a method different from the intrusion detection device according to the first embodiment. The contents other than those described below are the same as those of the intrusion detection apparatus according to the first embodiment.

  In the intrusion detection system according to the third embodiment of the present invention, the IP camera 201 has the video receiving terminal 203 for processing the communication data included in the target wireless signal received by the wireless LAN access point 202, the communication Communication data according to a communication protocol that does not need to transmit response information to the data to the IP camera 201 is generated.

  Specifically, in order to perform unicast communication with the video receiving terminal 203, the IP camera 201 transmits video data according to, for example, UDP (User Datagram Protocol) as a communication protocol.

  As a result, communication associated with transmission of video data is one-way from the IP camera 201 to the wireless LAN access point 202. That is, the video receiving terminal 203 does not transmit response information (ACK) to the IP camera 201 even when receiving video data from the IP camera 201.

  FIG. 11 is a diagram illustrating an example of a received radio wave in the intrusion detection device according to the third embodiment of the present invention.

  FIG. 12 is a diagram illustrating a delivery confirmation operation in wireless LAN communication between the IP camera and the wireless LAN access point.

  Even in a configuration in which unicast communication is performed between the IP camera 201 and the video receiving terminal 203, delivery confirmation is performed in wireless LAN communication between the IP camera 201 and the wireless LAN access point 202, as indicated by K in FIG. The

  That is, as shown by A in FIG. 12, when a wireless signal including video data is transmitted from the IP camera 201 to the wireless LAN access point 202, response information is sent from the wireless LAN access point 202 to the IP camera 201. A wireless signal including is transmitted.

  As a result, communication also occurs in the direction from the wireless LAN access point 202 to the IP camera 201. Each time a wireless signal including a packet of video data is transmitted from the IP camera 201 to the wireless LAN access point 202, wireless LAN access is performed. A wireless signal is also transmitted from the point 202.

  On the other hand, in the intrusion detection system according to the third embodiment of the present invention, as shown in FIG. 12B, when a detection operation is performed in the intrusion detection device 101, a delivery confirmation function is provided. A function to be disabled is added to the wireless LAN access point 202.

  That is, the wireless LAN access point 202 is set not to transmit a wireless signal including response information to the target wireless signal received from the IP camera 201 to the IP camera 201.

  As described above, in the intrusion detection apparatus according to the third embodiment of the present invention, it is possible to transmit radio waves only to the IP camera 201 in a state where the intrusion detection apparatus 101 is performing the detection operation.

  That is, the configuration for level determination in the intrusion detection device according to the first embodiment of the present invention and the transmission timing acquisition in the intrusion detection device according to the second embodiment of the present invention is not required, and the wireless LAN access point It is possible to reliably prevent erroneous detection in the intrusion detection device 101 only by changing the software in 202.

  Next, a modification of the intrusion detection system according to the third embodiment of the present invention will be described.

  In this modification, the IP camera 201 is communication data that conforms to a communication protocol that does not require the wireless LAN access point 202 to transmit a wireless signal including response information to the target wireless signal to the IP camera 201, and to a plurality of communication devices. Communication data for transmission is generated, and a target radio signal including the communication data is transmitted.

  Specifically, the IP camera 201 multicasts video data. In this case, delivery confirmation is not performed in wireless LAN communication. That is, a wireless signal including response information is not transmitted from the wireless LAN access point 202 to the IP camera 201.

  Note that the video receiving terminal 203 is set not to transmit response information to the IP camera 201 even when receiving video data from the IP camera 201.

  FIG. 13 is a diagram illustrating transmission of video data in a modified example of the intrusion detection system according to the third embodiment of the present invention.

  As indicated by C in FIG. 13, when the packet including the video data transmitted from the IP camera 201 is a multicast packet, the wireless LAN interface 32 receives the packet at the wireless LAN access point 202. The communication control unit 33 again outputs the packet to the wireless LAN interface 32 and wirelessly transmits the packet to another communication device.

  For this reason, radio waves are also transmitted from the wireless LAN access point 202 each time a packet is multicast from the IP camera 201.

  Therefore, in the intrusion detection system according to the third embodiment of the present invention, as shown by D in FIG. 13, the wireless LAN interface 32 has a function of not retransmitting multicast packets received at the wireless LAN interface 32. Add to access point 202.

  That is, the wireless LAN access point 202 is set not to convert communication data included in the target wireless signal received from the IP camera 201 into a wireless signal and transfer it to another communication device.

  Therefore, similarly, in the modified example of the intrusion detection device according to the third embodiment of the present invention, radio waves can be transmitted only to the IP camera 201 while the intrusion detection device 101 is performing the detection operation.

  It should be noted that the IP camera 201 is not limited to the configuration for multicasting video data, and the same effect can be obtained even in a configuration for broadcasting video data.

  Since other configurations and operations are the same as those of the intrusion detection device according to the first embodiment, detailed description thereof will not be repeated here.

  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.

<Fourth embodiment>
The present embodiment relates to an intrusion detection device that prevents false detection by a method different from the intrusion detection device according to the first embodiment. The contents other than those described below are the same as those of the intrusion detection apparatus according to the first embodiment.

  FIG. 14 is a diagram showing a configuration of an intrusion detection system according to the fourth embodiment of the present invention.

  Referring to FIG. 14, IP camera 201 captures, for example, a predetermined area and multicasts a packet including video data indicating the captured video to wireless LAN access point 202 via a wired line.

  The wireless LAN access point 202 converts the packet received from the IP camera 201 into a wireless signal according to a predetermined wireless communication method, for example, a 2.4 GHz band wireless LAN method, and transmits the wireless signal to the video receiving terminal 203.

  The video receiving terminal 203 converts the radio signal received from the wireless LAN access point 202 into video data according to a predetermined wireless communication system, for example, a 2.4 GHz band wireless LAN system, and displays and records video.

  Note that the video receiving terminal 203 is set not to transmit response information to the IP camera 201 even when receiving video data from the IP camera 201.

  FIG. 15 is a diagram illustrating an installation example of each device in the intrusion detection system according to the fourth embodiment of the present invention.

  Referring to FIG. 15, wireless LAN access point 202 serving as a transmission source and intrusion detection apparatus 101 are arranged at two corners on a diagonal line of room R, respectively. Video receiving terminal 203 </ b> A performs wireless communication with wireless LAN access point 202.

  Similar to the intrusion detection system according to the first embodiment of the present invention, a video receiving terminal 203B connected to the wireless LAN access point 202 by wire may be provided.

  The IP camera 201 is communication data in accordance with a communication protocol that does not require the wireless LAN access point 202 to transmit to the IP camera 201 a wireless signal including response information to the target wireless signal, and communication for transmission to a plurality of communication devices. Generate data. Then, the IP camera 201 transmits the generated communication data to the wireless LAN access point 202 via a wired line.

  The wireless LAN access point 202 converts communication data received from the IP camera 201 into a wireless signal and transfers it to the video receiving terminal 203A.

  The video receiving terminal 203 </ b> A receives the wireless signal transferred from the wireless LAN access point 202.

  Specifically, the IP camera 201 is connected to the wireless LAN access point 202 via a wired line, and settings are made so that video data is multicast from the IP camera 201 to the wireless LAN access point 202 via the wired line.

  Then, wireless communication by wireless LAN is performed between the wireless LAN access point 202 and the video receiving terminal 203A.

  In this way, with the configuration in which multicast packets are once transmitted from the IP camera 201 to the wireless LAN access point 202 via a wired line, the wireless LAN access point 202 instead of the IP camera 201 becomes a radio wave transmission source for intrusion detection. Therefore, the intrusion detection device 101 may simply use the received radio wave for signal processing for the detection operation without determining the transmission source of the received radio wave.

  That is, unlike the intrusion detection system according to the third exemplary embodiment of the present invention, the intrusion detection apparatus 101 does not perform special settings such as non-transmission of response information and non-transfer of packets in the wireless LAN access point 202. It is possible to reliably prevent false detection.

  Further, unlike the intrusion detection system according to the first embodiment of the present invention, it is possible to eliminate the restriction on the distance between the IP camera 201 and the wireless LAN access point 202.

  Further, the configuration for level determination in the intrusion detection device according to the first embodiment of the present invention and the transmission timing acquisition in the intrusion detection device according to the second embodiment of the present invention is not required. The software change of the wireless LAN access point 202 in the intrusion detection system according to the third embodiment of the invention becomes unnecessary, and erroneous detection in the intrusion detection apparatus 101 can be prevented with a simple configuration.

  That is, in the intrusion detection system according to the fourth embodiment of the present invention, it is possible to realize the intrusion detection function and prevent false detection without changing each device in the existing wireless LAN system. .

  It should be noted that the IP camera 201 is not limited to the configuration for multicasting video data, and the same effect can be obtained even in a configuration for broadcasting video data.

  Since other configurations and operations are the same as those of the intrusion detection device according to the first embodiment, detailed description thereof will not be repeated here.

  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 Reception part 12 Spatial feature-value calculation part 13 Detection part 14 Discriminating part 21 Array antenna part 22 RF reception part 23 Signal processing part 31 Communication antenna 32 Wireless LAN interface 33 Communication control part 34 Wired LAN interface 35 LAN port 41 Wireless LAN access Point unit 51 High frequency amplifier 52 Frequency down converter 53 AD conversion unit 54 Array signal processing unit 55 Detection result output unit 101 Intrusion detection device 201 IP camera (target device)
202 Wireless LAN access point (receiving side device)
203 Video receiving terminal 212 Wireless LAN access point 301 Intrusion detection system

Claims (11)

An intrusion detection device for detecting human actions in a predetermined area where a plurality of communication devices communicate by transmitting and receiving radio signals,
A receiver for receiving the radio signal;
A spatial feature amount calculating unit for calculating a spatial feature amount in the predetermined area based on the radio signal received by the receiving unit;
An intrusion detection apparatus comprising: a detection unit configured to detect a human motion in the predetermined area based on the spatial feature amount calculated by the spatial feature amount calculation unit. The target device is communication data that conforms to a communication protocol that does not require a reception-side device other than the target device among the plurality of communication devices to transmit the wireless signal including response information to the target wireless signal to the target device. And generating communication data to be transmitted to a plurality of the communication devices, transmitting the communication data to the receiving side device via a wired line,
The receiving side device converts the communication data received from the target device into a radio signal and transfers it to the other communication device,
The intrusion detection device according to claim 1, wherein the reception unit receives the wireless signal transferred from the reception-side device. The target device is communication data that conforms to a communication protocol that does not require a reception-side device other than the target device among the plurality of communication devices to transmit the wireless signal including response information to the target wireless signal to the target device. And generating communication data to be transmitted to the plurality of communication devices, transmitting the target radio signal including the communication data,
The said receiving side apparatus is set so that the said communication data contained in the said object radio signal received from the said target apparatus may be converted into a radio signal, and it may not transfer to the said other communication apparatus. Intrusion detection device. The intrusion detection device further includes:
A determination unit for determining whether the wireless signal received by the reception unit is a target wireless signal transmitted from a target device among the plurality of communication devices;
The intrusion detection device according to claim 1, wherein the spatial feature amount calculation unit calculates the spatial feature amount based on the target wireless signal determined by the determination unit. The intrusion detection device is arranged in the vicinity of a receiving side device other than the target device among the plurality of communication devices or integrated with the receiving side device,
The intrusion detection device according to claim 4, wherein the determination unit determines the target wireless signal based on a level of the wireless signal received by the reception unit.   The intrusion detection according to claim 5, wherein the determination unit determines that the wireless signal having a level that is greater than or equal to a first threshold and less than a second threshold that is greater than the first threshold is the target wireless signal. apparatus.   The determination unit acquires transmission timing information indicating a timing at which a receiving-side device other than the target device among the plurality of communication devices transmits the radio signal from the receiving-side device, and acquires the acquired transmission timing information The intrusion detection device according to claim 4, wherein the target wireless signal is determined based on the target wireless signal.   The determination unit acquires, as the transmission timing information, a level of an analog signal that is converted into the wireless signal to be transmitted in the reception side device, and determines the target wireless signal based on the acquired level. The intrusion detection device according to 7. The receiving side device other than the target device among the plurality of communication devices is set not to transmit the radio signal including response information to the target radio signal received from the target device to the target device.
The target device conforms to a communication protocol in which a data processing unit for processing communication data included in the target wireless signal received by the receiving side device does not need to transmit response information for the communication data to the target device. The intrusion detection device according to claim 1, wherein communication data is generated.   The intrusion detection device according to any one of claims 1 to 9, wherein the target device transmits data indicating a captured video included in the target wireless signal. A plurality of communication devices that communicate by transmitting and receiving radio signals to and from each other in a predetermined area;
An intrusion detection system comprising an intrusion detection device for detecting human movements in the predetermined area,
The intrusion detection device is
A receiver for receiving the radio signal;
A spatial feature amount calculating unit for calculating a spatial feature amount in the predetermined area based on the radio signal received by the receiving unit;
An intrusion detection system including a detection unit for detecting a human motion in the predetermined area based on the spatial feature amount calculated by the spatial feature amount calculation unit.

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