JP2002217811A - State detection method, state detection device, mobile terminal device, and movement state observation system - Google Patents

Abstract

(57) Abstract: A method and an apparatus for determining a moving state of a moving body without using an acceleration sensor are provided. An electromagnetic wave transmitted from a transmission facility is received and received by a receiver using an antenna, and its electric field intensity is measured by a measuring means. When the mobile terminal 7 moves,
Since a specific pattern occurs in the temporal variation of the electric field strength,
The time change of the measured electric field strength is analyzed and determined using the analyzing device 4, and the determination result is output from the output unit 5. By providing the mobile terminal 7 with a communication function, it is possible to determine the moving state of the moving body at a remote place.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile terminal such as a portable telephone or a navigator, and more particularly to a state detecting method and apparatus for detecting whether the mobile terminal is stationary or moving.
Further, the present invention relates to a moving state observation system using the same.

[0002]

2. Description of the Related Art There are proposals for observing whether a moving object such as a vehicle or a person is moving or stopped, from a remote place, and for controlling the moving object. As a method of detecting a moving state of a moving body, there is, for example, JP-A-5-101283 "Vehicle movement detecting device". This detection device detects the theft by detecting the movement of the vehicle from the duration when the fluctuation range of the sensor for detecting the vibration and the electric field strength becomes larger than a certain value. As a device for automatically recognizing the operation and behavior of a moving object such as a human, an animal, or a machine, there is Japanese Patent Application Laid-Open No. H10-113343 "Method and device for recognizing operation and behavior". Also in this method, the acceleration sensor and the electromagnetic wave measuring means are used together.

[0003]

In the above prior art,
Since the vibration sensor alone has a problem in the detection accuracy, in order to compensate for the problem, the processing is performed together with the duration when the fluctuation range of the electric field intensity becomes larger than a certain value, thereby improving the operation accuracy. Therefore, in this method, it is necessary to (1) install a vibration sensor in the device, and (2) use only the duration when the fluctuation range of the electric field strength becomes larger than a certain value. It is difficult to recognize with high accuracy. (3) A general-purpose wireless device such as a mobile phone usually uses an AGC (automatic gain control circuit) for suppressing fading, a tie diversity antenna, or the like, and then receives the signal with a receiver. Therefore, there is a problem that fading is difficult to observe.

An object of the present invention is to overcome the problems of the prior art, and to provide a state detecting method and apparatus capable of recognizing the electric field intensity with high accuracy alone and a terminal apparatus using the same. Another object of the present invention is to provide a state observation system in which the state detection method is applied to observation of a moving object such as a pedestrian or a vehicle.

[0005]

SUMMARY OF THE INVENTION The present invention, which achieves the above objects, receives an electromagnetic wave transmitted from a transmission source, measures a temporal variation of the received electromagnetic wave, and analyzes the measured temporal variation to receive the electromagnetic wave. It is characterized in that a state change due to movement of the side or the transmission source is determined. The state change is determined based on whether or not the time variation of the electromagnetic wave has periodicity. Alternatively, the time variation of the electromagnetic wave is determined using a time-frequency analysis.

Further, the present invention is a state detecting device for receiving an electromagnetic wave transmitted from a transmission source of an electromagnetic wave and detecting a moving state of a receiving side or a transmission source by using the fluctuation of the electromagnetic wave to measure the fluctuation of the electromagnetic wave. Measuring means, analyzing the temporal variation of the electromagnetic wave, analyzing means for determining, and output means for outputting the determination result, determine the state change of the observed electromagnetic wave temporal variation, and determine the state change of the determination result. It is characterized by outputting.

The measuring means includes means for measuring the electric field strength of the electromagnetic wave, means for measuring the gain of AGC (auto gain control), means for observing the switching signal of the diversity antenna, or the magnitude and time delay of the multipath. It is a means to observe.

Further, the state detecting device of the present invention includes an analyzing means for detecting a multipath from a received electromagnetic wave, analyzing and determining a temporal change of the multipath, and an output means for outputting a determination result. The method is characterized in that a state change of a temporal variation of the observed multipath is determined, and a state change as a result of the determination is output.

According to the present invention, since the state detection based on the electric field strength is performed independently without using the vibration sensor, downsizing and cost reduction can be realized. In this case, the state detection based on the electric field intensity can be performed with high accuracy even by itself. In addition, since the control signals of the AGC and diversity antenna are related to fading, the state can be easily detected using the control signals.

Further, the mobile terminal device of the present invention includes a position detecting device, and determines a change in the state of the terminal by providing any of the above-described state detecting devices. When it is determined that the operation has stopped, the operation of the position detection device is started or stopped. This enables labor saving of the mobile terminal.

Further, the moving state observation system of the present invention connects a mobile terminal provided with the above (position detecting device) and the state / position management server via a network, and further connects the server with a client terminal. The mobile terminal is configured to be connected directly or via a network, and the movement / stop state of a specific mobile terminal requested by the client is acquired by the server, and is notified to the client. This can contribute to nursing care for elderly people and infants, and investigation of vehicle behavior.

[0012]

Embodiments of the present invention will be described below. FIG. 1 shows an embodiment of the present invention and is a functional block diagram of a state detection device provided in a mobile terminal. The state detection device 6 includes the receiver 1, the antenna 2 of the receiver 1, the receiver 1,
The electric field intensity measuring unit 3 measures the electric field intensity of the electromagnetic wave received by the control unit, the judgment unit 4 analyzes and judges the temporal variation of the acquired electric field intensity, and the judgment result output unit 5. The state detection device 6 is provided in the mobile terminal 7 and receives a radio wave from the transmission equipment 8.

The receiver 1 receives the electromagnetic wave transmitted from the transmission equipment 8 through the antenna 2 and receives the electromagnetic wave. In this embodiment, the receiver is described as a receiver, but a wireless telephone device such as a PHS, a mobile phone, a CDMA, a satellite mobile phone, or a wireless device with a specific low power and a weak power for business or amateur use, And communication devices using ultrasonic waves, etc.
It may have a transmission function.

The electric field strength measuring means 3 measures the electric field strength of the received electromagnetic wave, and measures the electric field strength of the electromagnetic wave which changes every moment.

FIG. 2 shows an example measured by the electric field strength measuring means 3. The vertical axis 25 is the measured electric field strength, and the horizontal axis 2
4 represents time. The section 21 in the measured waveform is a result of observing the electromagnetic wave transmitted from the transmission equipment 8 when the person holding the mobile terminal 6 is in a stationary state, and the section 22
Is an observation result of the electric field intensity when the person carrying the mobile terminal 8 is moving (walking). The measured locations are almost the same. There is a portion (23) in the section 21 where the electric field strength is temporarily low. This is a waveform change that appears because the truck has passed just before the possessor. Note that the section 26 is a section in which the transmission equipment 8 suspends transmission, and therefore the electric field strength is weak.

As can be seen from FIG. 2, the shape of the waveform is clearly different between the stationary state (21) and the moving state (22). Normally, when an electromagnetic wave reaches the receiving antenna 2 from the transmitting facility 8, there is a direct wave that reaches the receiving antenna 2 from the transmitting facility 8 and a reflected wave that reaches the receiving antenna 2 by being reflected on a surrounding object (the ground or a building). . When stationary, the degree of interference between the direct wave and the reflected wave does not change because the propagation path of the electromagnetic wave does not change, but when moving, the path distance between the direct wave arriving from the transmission equipment 8 and the reflected wave changes with movement. The degree of interference changes (fading), and such a measurement result is obtained.

The judgment means 4 for analyzing and judging the temporal variation of the electric field strength is a part for judging the moving state of the mobile terminal 7 by analyzing the difference in the waveform in FIG. Some examples of the determination method are shown below. (1) Analysis and Judgment Means Using Periodicity FIG. 3 shows an example of analysis and judgment means using periodicity. Fading occurs due to the phase difference between the direct wave and the indirect wave. When the phases are the same, the electric field strength is observed strongly, but when the phase is reversed, the electric field strength is observed weakly. The strength changes periodically in proportion to the moving distance. Therefore, the presence or absence of the movement can be determined by determining whether or not the fluctuation of the strength has a periodicity.

Part 23 of FIG. 2 is a temporary interruption of electromagnetic waves caused by the passage of the truck. Therefore, the signal waveform does not change periodically. In addition, fading may occur due to shaking of tree branches and leaves,
There is no periodicity in the fading caused by the shaking of the leaves.

FIG. 3 shows the means for determining periodicity. The periodicity extracting means 31 is means for finding periodicity from the signal waveform of the measured electric field strength. For example, an autocorrelation function is used as a means for finding the periodicity, or a Fourier transform or the like is used as a means for frequency analysis.

The autocorrelation function is a means for obtaining a correlation while slightly shifting the time of the same measured waveform as the measured waveform, and determines the periodicity based on whether or not a maximum value of the correlation other than the time difference of 0 appears. Accordingly, the periodicity can be determined by performing this determination by the determination unit 32.

The Fourier transform is a means for converting measured horizontal axis time data (time domain) to a horizontal axis frequency (frequency domain). In the frequency domain, it is converted into an expression called signal strength (spectrum) in each frequency component of the measurement data. The presence or absence of the periodicity can be determined based on whether or not there is a strong portion of the spectrum. Therefore, the determining means 32 determines whether the spectrum is larger than other spectra and determines the periodicity. (2) Analysis and Judgment Technique Using Pattern of Electric Field Intensity Change FIG. 4 shows an example of an analysis and judgment means using pattern comparison. It comprises an electric field intensity pattern comparison / judgment means 41 and an electric field intensity pattern 42 for comparison. First, the measured electric field strength is input to the comparing and judging means 41. Here, the temporal change of the electric field intensity is compared with the electric field intensity pattern 42 for comparison using a correlation function or the like. The comparison determining means 41 can determine the presence or absence of movement and the surrounding environment (degree of congestion of an object) by comparing with the electric field intensity pattern.

The electric field intensity pattern 42 stores electric field intensity change patterns in various moving states.
For example, if the mobile terminal 8 does not move, the electric field strength does not change much. Also, if you move in an environment where there is nothing around you,
Since fading occurs due to interference between a direct wave and a reflected wave reflected from the ground, it is observed as a relatively clear periodic waveform. In addition, when there are many buildings and the like in the surroundings, there is a clear periodicity due to interference with various reflections, but a clean periodic function is not obtained. These patterns are stored in the electric field intensity pattern 42. (3) Analysis and Judgment Method Using Time Frequency Analysis FIG. 5 shows an analysis and judgment method using time frequency analysis. Wavelet transform is a typical means of time-frequency analysis. The wavelet transform is an analysis means for making it easy to find a change point of a signal waveform and analyzing an aperiodic signal. For example, it is possible to extract a change in the electric field intensity that appears in a single shot, or to extract a position where the frequency of the electric field intensity waveform changes as a feature amount. It is also possible to discriminate a point where a DC or aperiodic motion changes to a periodic motion.

First, a time-frequency characteristic converting means 51 converts a temporal change of the electric field strength into a time-frequency characteristic.
By the conversion, the above-mentioned change point of the signal and the feature amount of the single-shot signal are extracted. The feature amounts for comparison 53 are registered in advance, and the feature amount output from the conversion unit 51 and the feature amount of the feature amount 53 are compared. Then, the feature quantity of the feature quantity 53 having the best feature quantity is output as the recognition result.

In this manner, the result of the analysis and determination of the temporal variation of the electric field strength by the determination means 4 is taken out from the output means 5. In the present embodiment, the detection function is provided on the mobile terminal side. However, the transmission function may be provided on the mobile terminal 7 side, and the detection function may be provided on the transmission equipment 8 side (in this case, the reception equipment). Similar effects can be obtained. Further, both the mobile terminal 7 and the transmission facility 8 may have a detection function, and the determination may be made based on both results.

According to the present embodiment, it is determined whether the mobile terminal is stationary or moving by receiving the electromagnetic wave transmitted from the transmitting equipment and analyzing and determining the time variation of the electric field strength. it can.

Referring to FIG. 6, an embodiment will be described in which instead of directly measuring the electric field intensity, the electric field intensity is obtained indirectly using a signal for controlling the gain of AGC (automatic gain control).

The AGC uses the gain control signal 63 according to the intensity of the electromagnetic wave coming from the antenna 2 in order to reduce the change in the electric field intensity due to fading. In the case where the amplification factor of the AGC 61 is large,
This is a device for sending electromagnetic waves of almost constant intensity to a receiver. Therefore, in an apparatus using AGC, the antenna 2
Even if the intensity of the incoming electromagnetic wave changes, the intensity of the electric field intensity measured by the receiver does not change.

Therefore, a means 62 for observing the control signal of the amplification factor is provided on the signal line 63 for controlling the amplification factor of the AGC, and the value of the amplification factor control signal 63 is observed. Since the control signal 63 is almost proportional to the strength of the electromagnetic wave coming from the antenna 2, the control signal 63 is used to determine whether the mobile terminal is stationary or moving, in the same way as using the electric field strength received by the receiver. Can be used as a signal.

According to the present embodiment, there is an effect that even a receiver equipped with an AGC can observe a change in an electromagnetic wave caused by the stationary and moving of the mobile terminal.

With reference to FIG. 7, an embodiment will be described in which instead of directly measuring the electric field intensity, the electric field intensity is obtained indirectly using the switching signal of the tie diversity antenna. Like the AGC, the diversity antenna is provided with a plurality of antennas 71 and 72 in order to reduce the change in electric field strength due to fading, and the antenna receiving the strongest electromagnetic wave is always selected to have an almost constant strength. The antennas 71 and 72 are switched by the changeover switch 73 in order to transmit the electromagnetic wave of (1) to the receiver 1. Therefore, in the apparatus using the diversity antenna, the intensity of the electric field intensity measured by the receiver 1 does not change even if the intensity of the electromagnetic wave input from the antenna changes.

Therefore, the signal 76 for switching the antenna is
The movement state is determined by observing the switching signal of the antenna using the means 74 for observing the signal. The determination method is almost the same as the determination procedure using the periodicity described with reference to FIG. 3, but the signal 76 for switching the antenna is a digital signal indicating which antenna is to be switched.

FIG. 8 shows an example. When the antenna A is selected, the signal level is 83, and when the antenna B is selected, the signal level is 84. The section 81 indicates a stationary state, and the section 82 indicates a switching change of the moving state. Since the section 81 is stationary, no fading occurs and no antenna switching occurs. In the section 82, antenna switching frequently occurs with movement. That is, in the example of FIG. 3, the strength of the electric field strength is input, but in the present embodiment, by inputting the level of the switching signal, the processing can be performed using the same analysis and determination device as in FIG. .

According to the present embodiment, even in a receiver equipped with a diversity antenna, it is possible to determine whether the mobile terminal is stationary or moving.

Next, code division multiple access (Code Divis
An embodiment of the state detecting means in the case of using spread spectrum communication as in the case of "ion multiple access (hereinafter referred to as [CDMA])" will be described.

FIG. 9 is an example showing a correlation value when demodulated by a despreading code. The vertical axis represents the correlation value, and the horizontal axis represents the delay time. Reference numeral 91 denotes a peak value of the correlation representing the direct wave, and the indicated time is proportional to the distance from the transmission source. Reference numeral 92 denotes a multipath signal, which is delayed in time because the transmission path is longer than the direct wave. While stationary,
Although the peak value of the correlation due to the multipath hardly fluctuates, the position and the strength of the multipath fluctuate with time because the propagation path of the multipath changes due to movement (93 and 94). Therefore, by comparing the amount of change in the multipath portion, it is possible to determine whether the stationary state or the moving state.

As a means for comparing fluctuations, a correlation between a correlation value of a multipath portion one calculation cycle or several calculation cycles ago and a newly obtained correlation value is obtained, and if the correlation is large, a stationary state is obtained. Can be determined. According to this, even a receiver for spread spectrum communication like CDMA can determine whether the mobile terminal is stationary or moving.

Next, an embodiment for recognizing congestion of surrounding objects when spread spectrum communication is used like CDMA will be described with reference to FIG. Section 10
4 is a correlation value when there is nothing around. If there is nothing around, there is not much multipath, so
Only 01 is observed. The section 105 is an example of a case where there are many objects around. Since the number of multipaths increases as the number of objects increases, a large number of reflected waves 102 and 103 are observed. When an object is near, a reflected wave is observed near the direct wave 101 (102), and when it is far away, a reflected wave is observed at a place distant from the direct wave (103).

Therefore, if there are many multipaths, the mobile terminal is located in a complicated place (for example, in a crowded city), and if there are not many multipaths, the mobile terminal is located in a place with few objects around. Recognized as present. Also, by judging the time difference between the reflected wave group and the direct wave,
It is also possible to recognize how far surrounding objects are away from the mobile terminal.

FIG. 11 shows a procedure for judging stationary or moving from multipath. (A) is for judging the variation of the correlation peak due to multipath. When wireless reception is performed, a correlation value is calculated, a delay profile is created, and a multipath portion is extracted (114). Next, a comparison is made with the multipath portion calculated a predetermined time ago. If the peak value of the multipath varies greatly, it is determined that the mobile device is moving, and if the variation is small, it is determined that the vehicle is stationary. In (b), it is determined whether the location is a complicated place or a place with few objects based on whether there are many or few multipaths.

According to the present embodiment, in a receiver for spread spectrum communication such as CDMA, there is an effect that the degree of congestion around the mobile terminal can be recognized in addition to the determination of the stationary / moving state of the mobile terminal.

Next, an embodiment in which the function of the mobile terminal device is activated or deactivated by using the state detection device will be described. FIG.
Is an example in which the mobile terminal has a position detecting means (for example, GPS), and the position detecting means is controlled by the state detecting device.

When it is desired to grasp the position of the mobile terminal using the position detecting means 122, it is necessary to always operate the position detecting means 122. However, electric power is required to operate the position detecting means, and there are problems such as a short operation time in a battery-driven device.

This embodiment is a means for solving this problem. In the case of position detection, it is necessary to detect the position when moving, but when stationary, there is no need to detect the position because it does not move. Therefore, power can be saved by turning on the power of the position detecting means during movement and turning off the power while stationary. The position detecting means 122 measures its own position using the positioning radio wave received by the antenna 121. The position detecting means 122 is provided with a starter 124 of the position detecting means for controlling the operation of this means. In this apparatus, the start / stop of the position detecting means 122 is controlled using the determination result 125 of the movement detecting means 126 caused by the fluctuation of the electromagnetic wave.

The operation of this embodiment will be described with reference to the flow of FIG. After acquiring the electric field strength, the movement detecting means 126 based on the electromagnetic wave fluctuation analyzes the electric field strength (13).
2), it is determined whether or not the movement (133). If it is determined that the terminal 7 has moved, the position of the terminal 7 is moving, so that the position detection device is activated (134), and the position detection process is performed (135). Thereby, the position after the movement can be obtained. Thereafter, the position detecting device is stopped again (136), and the power is saved. If it is determined in the movement determination that the vehicle is stationary, the position has not been moved from the position one calculation cycle before, so the position detection processing is unnecessary, and the processing for stopping the position detection device (13)
Perform 7).

According to the present embodiment, there is an effect that the power consumption of the device can be reduced by controlling a device (such as a position detection device) associated with the mobile terminal based on the determination result of the movement detection.

FIGS. 14 and 15 show an embodiment in which the recognition result of the movement detection is displayed. In the display screen 141, vehicles and people are displayed on a map. 145 is a stationary vehicle, and 143 is a moving vehicle. In this vehicle, in addition to the movement detecting means, means for detecting a position,
And a communication means for transmitting a result of detection of movement and position. That is, the configuration is such that communication means is added to the configuration of FIG.

"Moving" / "still" by the movement detecting means
Is determined, the position information obtained by the position detecting means is obtained,
The data is transmitted to a display screen at a remote place using communication means, and the location and status are displayed on a map of a display device such as a monitoring center. Similarly, humans 142, 14
4 and 146 also have devices of the same configuration, and the center has a stationary person 144 and a walking person 142 and 14
A display such as 6 is performed.

FIG. 15 shows an example of display on a device that cannot display a map. The moving state of the target is recognized, and the result is displayed in a character-friendly manner such as “moving” / “not moving” (152, 153). In this case, since only the movement / stop needs to be detected, the position detecting means may not be provided.

FIG. 16 shows an example of a system that displays the screens of FIGS. 14 and 15 and uses the above-described state detection method. 161 is a state detection device due to radio wave fluctuation, 1
Reference numeral 62 denotes a position detecting device, which is means for detecting a position using, for example, a GPS. A communication device 164 is, for example, a data communication device using a mobile phone network or wireless communication. Of course, a communication network that can be directly connected to the Internet may be used. The mobile terminal 163 includes the state detection device 161, the position detection device 162, and the communication device 164.
The communication network 165 is a mobile phone network, a packet communication network, or an Internet network for the communication device 164 to perform communication. The mobile terminal 163 uses the communication network 165 to state and
It is connected to the position management server 167.

The status / location management server 167 is a server that manages the status and location of the mobile terminal 163. A state / position management DB 166 is also provided for storing the management data. The state / position management server 167 also has a Web server function for transmitting information to the client terminal. The terminals 169 and 160 are terminals for displaying the state of a person or an object possessing the mobile terminal 163. It may be a fixed type like the terminal 169, or the terminal 160
A terminal that moves like this may be used. Hereinafter, this is called a client.

The client and server 167 are connected by a communication network 168. Like the communication network 165, the communication network 168 includes a telephone line network (wired / wireless), a packet communication network for various wireless communications, an Internet network, and the like.

Next, referring to FIG.
The procedure for displaying the screen of FIG. 14 as shown in FIG. 14 will be described. In the following, a system that can grasp the state of a child or an elderly person will be described as an example.

When searching for the whereabouts of a child or an elderly person, the state / location management server 1 is used by using the client terminal 169.
A request for exploration is made to 67 (170). Server 167
Is connected via telephone line or the Internet (1
71). The server 167 determines whether the terminal 1 has been
A line is connected to 63 using the communication network 165 (17
2). The terminal 163 acquires the position and the state information by using the position detection device 162 and the state detection device 161 to acquire the position information (173, 174).

The acquired position / state information is sent to the server 167 (175). The server 167 uses the acquired position information and state information to display the terminal 16 on the map on the display screen.
The position and status of 3 are displayed. For example, in the example of FIG.
The person at the position 144 represents a stationary state, the person at the position 142 represents running, and the person at the position 146 represents walking, and such data is generated by the server 167. The data format may be expressed using a Web language such as HTML or XML.

The state and position management server DB 166 shown in FIG.
Manages the state and position history. For example, in order to display a state in which a person goes from 144 to 142 in FIG. 14 and finally moves to 146, a history of positions and states is required. This history is stored in 166. These display data are transmitted to the client 16 using the communication path 168.
9 and the client terminal generates a screen as shown in FIG. 14 based on this data.

A user who has requested the whereabouts of a child or an elderly person is
By looking at the screen of the client 169, it is possible to grasp where and where the child and the elderly are. The distance traveled can be measured using a position detection system, but when using GPS or the like, there is a variation in position accuracy of about 20 m, so if you are acting in the same place, you are still or not. May not be determined. However, this system can determine whether the person is still or not, so that it is possible to determine whether the child is playing well outside or whether the elderly are having difficulty walking.

In the above description, a human was used as an example.
5 can also be displayed. In this case, it is also possible to determine whether the car is completely stationary or moving slowly due to traffic congestion or the like. In addition, it is also possible to acquire the operating state of the other party before the call and use it as a determination material such as not to make a call if the user is moving.

[0058]

According to the present invention, it is possible to determine whether the mobile terminal is stationary or moving by analyzing and determining the temporal variation of the electric field strength of the electromagnetic wave received from the transmitting equipment. Also, in a receiver equipped with an AGC or a tie diversity antenna, or in a CDM
Even in a receiver for spread spectrum communication as shown in A, it is possible to observe the fluctuation of the electromagnetic wave accompanying the stationary and moving of the mobile terminal.

According to the present invention, the power consumption of the device can be reduced by controlling the device (such as a position detecting device) attached to the device based on the determination result of the movement detection.

According to the present invention, the moving state of a person or a car can be observed by analyzing and determining the temporal variation of the electric field strength of the electromagnetic wave, and the nursing of the elderly and children or the behavior of the vehicle can be performed. Can be useful for investigations.

[Brief description of the drawings]

FIG. 1 is a functional block diagram showing a configuration of a state detection device according to one embodiment of the present invention.

FIGS. 2A and 2B are waveform diagrams of a stationary state and a moving state in which electric field intensity is measured.

FIG. 3 is a functional block diagram of an analysis and determination unit using periodicity.

FIG. 4 is a functional block diagram of an analysis and judgment unit using pattern comparison.

FIG. 5 is a functional block diagram of an analysis and determination unit using time-frequency analysis.

FIG. 6 is a configuration diagram of indirectly obtaining an electric field strength using a signal for controlling an AGC amplification factor.

FIG. 7 is a configuration diagram of indirectly obtaining an electric field strength using a switching signal of a diversity antenna.

FIG. 8 is an explanatory diagram showing a stationary / moving state of the switching signal of the diversity antenna.

FIG. 9 is a characteristic diagram showing a correlation value when demodulated by a despreading code.

FIG. 10 is a characteristic diagram showing how a correlation value when demodulated by a despreading code is affected by surrounding objects.

FIG. 11 is a flowchart illustrating a procedure for determining stationary or moving from a multipath.

FIG. 12 is a functional block diagram of a mobile terminal according to another embodiment of the present invention, which starts or stops the movement of the position detecting means using the determination result of the moving state.

FIG. 13 is a flowchart for controlling start / stop of a position detection unit in the mobile terminal.

FIG. 14 is an exemplary diagram showing a determination result of a mobile terminal displayed on a map on a display screen.

FIG. 15 is an exemplary diagram showing a determination result of a mobile terminal displayed in characters.

FIG. 16 is a configuration diagram of a moving state observation system in an application example of the present invention.

FIG. 17 is a flowchart showing a processing procedure of the moving state observation system.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Receiver, 2 ... Antenna, 3 ... Electric field strength measuring means,
4: Analysis means for temporal fluctuation of electric field strength, 5 ... Output means for determination result, 6 ... State detection device, 7 ... Mobile terminal, 8 ... Transmission equipment, 161 ... State detection device, 162 ... Position detection device, 164 ... Communication device, 165,168 ... Communication network, 16
6 state / position management DB, 167 state / position management server, 160, 169 client terminal.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Susumu Okamura 1-6-27 Shinsuna, Koto-ku, Tokyo Inside the Public Works Division, Hitachi, Ltd. (72) Koji Kurimura 1-6-1 Shinsuna, Koto-ku, Tokyo No. 27 F-term in Hitachi Public Works Division (Reference) 2C032 HD03 2F029 AA02 AA07 AB05 AC02 AC04 AC14 AC16 5H180 AA22 BB04 BB05 FF22 5K067 AA41 BB21 EE02 EE12 EE32 GG11 HH21 HH22

Claims (10)

[Claims] 1. An electromagnetic wave transmitted from a transmission source is received,
A state detecting method comprising: measuring a temporal change of a received electromagnetic wave; analyzing the measured temporal change; and determining a state change due to movement of a receiving side or a transmission source. 2. The state detection method according to claim 1, wherein the state change is determined based on whether or not the time variation of the electromagnetic wave has periodicity. 3. The state detection method according to claim 1, wherein the state change is determined by using a time-frequency analysis to determine a temporal change of the electromagnetic wave. 4. A state detecting device which receives an electromagnetic wave transmitted from a transmission source of the electromagnetic wave and detects a moving state of a receiving side or a transmission source by using the fluctuation of the electromagnetic wave, and a measuring means for measuring the fluctuation of the electromagnetic wave. Analysis means for analyzing the temporal variation of the electromagnetic wave, and an output means for outputting the determination result, determining the change in the state of the temporal variation of the observed electromagnetic wave, and outputting the state change of the determination result. Characteristic state detection device. 5. The method according to claim 4, wherein the measuring unit is configured to measure an electric field intensity of an electromagnetic wave.
A state detecting device, which is a means for measuring a gain of a GC (auto gain control), a means for observing a switching signal of a tie diversity antenna, or a means for observing a magnitude or a time delay of a multipath. 6. A state detection device that receives an electromagnetic wave transmitted from a transmission source of an electromagnetic wave and detects a moving state of a receiving side or a transmission source by using a variation of the electromagnetic wave. Detecting means for analyzing and analyzing the temporal variation of the multipath, and outputting means for outputting a determination result, determining a state change of the observed temporal variation of the multipath, and determining a state change of the determination result. A state detection device characterized by outputting. 7. A mobile terminal device provided with a position detecting device, wherein a state change of the mobile terminal device is determined by providing the state detecting device according to any one of claims 4 to 6, and the state of the terminal device is determined. When it is determined that has changed from stop to move or from move to stop, the operation of the position detecting device is started or stopped. 8. A moving state observation system for connecting a plurality of mobile terminal devices to a state management server via a communication network and observing the state of the mobile terminal device at a remote location, wherein a time variation of an electromagnetic wave received by the mobile terminal device is determined. A state detection device that analyzes and determines a change in the state of movement / stop, or the state detection device and a position detection device are provided, and the state management server acquires a state change or a state change and a position of a predetermined mobile terminal device. A moving state observation system characterized in that the moving state is displayed. 9. The state management server according to claim 8, wherein the state management server is connected to the client terminal via a communication network, acquires a state change or a state change and a position of the mobile terminal device requested by the client, and transmits the acquired state change to the client terminal. A moving state observation system characterized by transmitting and displaying. 10. A moving state observing method for connecting a plurality of mobile terminal apparatuses to a state management server via a communication network and observing the state of the mobile terminal apparatus at a remote place. A moving state observing method, wherein a moving / stop state change obtained by analyzing a temporal variation of an electromagnetic wave received by the apparatus is acquired from the mobile terminal apparatus and distributed to a client terminal connected via a communication network.