JP2003121537A - Monitoring method, system thereof, and receiver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a monitoring method for distinguishing a mobile unit, such as an authorized human being from an unauthorized intruding object. SOLUTION: A transmitter 10 transmits radio waves 1 having a specific pulse signal into a monitored region 18. The radio waves, and radio waves, obtained by the reflection of the radio waves within the monitored region 18, are received by an antenna 16, thus detecting the electric field strength characteristics value in the radio waves at an electric field strength characteristics value detection section 22. Then, when a variation detection section 23 detects the variation in the electric field strength characteristics value, a verification radio wave transmission section 25 transmits radio waves for verification. After that, a response radio wave reception section 26 receives radio waves for response from a terminal apparatus 80. A reporting section 27 determines whether an object that becomes a factor for the variation is valid, based on the presence or absence of the reception of radio waves for application.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a monitoring method for detecting fluctuations in a predetermined monitoring area, a system therefor, and a receiver.

[0002]

2. Description of the Related Art There is known an intruder detection device for detecting an intruder (person) in a predetermined monitoring area. For example, Japanese Patent Application Laid-Open No. 2
The intruder detection device disclosed in Japanese Patent Application Publication No. 000-338231 has an FM-unit in which the frequency continuously changes in a single device.
A transmitter that transmits a CW wave and the transmitted FM-CW
A receiving unit for receiving the reflected wave of the wave is provided, and the presence or absence of an intruder in the monitoring area is detected based on the spectral characteristics of the reflected wave received by the receiving unit.

[0003]

However, the above-described conventional intruder detection device has a problem that the power consumption is large because the FM-CW wave is used. Further, since the laser type sensor has a transmitter and a receiver incorporated in a single intruder detection device, there is a problem that it is not possible to detect an intruder with high accuracy by combining directivity of transmitting and receiving antennas. Further, the above-described conventional intruder detection device has a problem in that it is not possible to distinguish a moving body such as an authorized legitimate person from an unauthorized intruder in the monitoring area.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is to provide a monitoring method, a system therefor, and a receiving apparatus capable of saving power. It is another object of the present invention to provide a monitoring method, a system thereof and a receiving device capable of detecting an intruding object in the monitoring area with high accuracy. It is another object of the present invention to provide a monitoring method, a system thereof, and a receiving device capable of distinguishing a moving body such as a legitimate authorized person from an unauthorized intruder in the monitoring area.

[0005]

In order to solve the above-mentioned problems of the prior art and achieve the above-mentioned object, the monitoring method of the first invention is carried out by a transmitter, a receiver and a mobile unit. Using the terminal device is a monitoring method for monitoring the movement of an object in a predetermined monitoring area, the transmitting device transmits a radio wave of a predetermined pulse signal in the predetermined monitoring area, The receiving device receives at least one of the radio waves and the radio waves obtained by reflecting the radio waves in the monitoring area, the receiving device detects the electric field strength characteristic value of the received radio waves, When the receiving device transmits a confirmation radio wave within the monitoring area when the detected electric field strength characteristic value has a predetermined variation, and when the terminal device receives the confirmation radio wave, a response is sent. And then the receiver receives the response. Based on the presence or absence of the reception of the radio wave use, determines the validity of the object causes the change.

The operation of the monitoring method of the first invention is as follows. The transmitting device transmits a radio wave of a predetermined pulse signal into a predetermined monitoring area. Then, the receiving device receives at least one of the radio waves and the radio waves obtained by reflecting the radio waves in the monitoring area. Next, the receiving device detects the electric field strength characteristic value of the received radio wave. next,
The receiving device transmits a radio wave for confirmation in the monitoring area when the detected electric field strength characteristic value has a predetermined variation. Then, when the terminal device receives the confirmation radio wave, it transmits a response radio wave. Next, the receiving device determines the legitimacy of the object that causes the fluctuation, based on whether or not the response radio wave is received.

In the monitoring method according to the first aspect of the present invention, preferably, when the receiving device does not receive the response radio wave within a predetermined time after transmitting the confirmation radio wave, The object is determined to be an unauthorized intruder.
Further, in the monitoring method of the first invention, preferably, the receiving device has a first electric field strength characteristic value detected in a state where the intruder is not present in the monitoring area and a second electric field detected at the time of monitoring. The intensity characteristic value is compared, and based on the result of the comparison, it is determined whether or not there is the predetermined variation. Further, in the monitoring method of the first invention, preferably, the receiving device is
The difference between the first electric field strength characteristic value and the second electric field strength characteristic is obtained, and when the difference exceeds a predetermined threshold value, it is determined that there is the predetermined fluctuation.

Further, in the monitoring method of the first invention, preferably, the receiving device averages a plurality of electric field strengths detected at predetermined different timings to generate the electric field strength characteristic value. The monitoring method of the first invention is preferably
When the receiving device receives a plurality of radio waves corresponding to a single pulsed radio wave transmitted by the transmitting device, of the plurality of received radio waves, reflection from a moving object that is not an intruder in the monitoring area is received. The electric field intensity characteristic value is calculated by using the electric field intensity of an electric wave other than the electric wave received at a predetermined timing corresponding to the wave. In the monitoring method according to the first aspect of the invention, preferably, the receiving means calculates a difference between the detected electric field strength characteristic value and the electric field strength characteristic value detected a predetermined time before the electric field strength characteristic value. Then, when the difference exceeds a predetermined threshold value, it is determined that there is the predetermined variation. The monitoring method of the first invention is
Preferably, the receiving device detects, as the electric field strength characteristic value, a delay profile characteristic value indicating a time characteristic of the electric field strength of the received radio wave.

The monitoring system of the second aspect of the invention is a monitoring system for monitoring the movement of an object within a predetermined monitoring area, and transmitting radio waves of a predetermined pulse signal into the predetermined monitoring area. A receiving device, and a terminal device that is held by a mobile body and that transmits a response radio wave when receiving a confirmation radio wave, and the receiving means includes the radio wave and the radio wave within the monitoring area. An antenna for receiving at least one of the electric waves obtained by reflection, an electric field strength characteristic value detecting means for detecting an electric field strength characteristic value of the received electric wave, and a predetermined electric field strength characteristic value for the detected electric field strength characteristic value. A fluctuation detecting means for detecting whether there is a fluctuation, a confirmation radio wave transmitting means for transmitting the confirmation radio wave in the monitoring area when the predetermined fluctuation is present, and a reception radio wave for receiving the response radio wave. Based on the presence or absence of And a monitoring means for determining the validity of the object causes the movement.

The receiving device of the third invention is a receiving device for monitoring the movement of an object within a predetermined monitoring area,
An antenna for receiving at least one of a radio wave transmitted by a transmitter and a radio wave obtained by reflecting the radio wave within the monitoring area, and an electric field strength characteristic value detection for detecting an electric field strength characteristic value of the received radio wave Means for detecting whether or not the detected electric field strength characteristic value has a predetermined fluctuation, and, if there is the predetermined fluctuation, the confirmation device within the monitoring area. And a monitoring means for judging the legitimacy of the object causing the fluctuation based on the presence or absence of the response radio wave corresponding to the confirmation radio wave.

The monitoring method of the fourth aspect of the invention is a monitoring method for monitoring the movement of an object within a predetermined monitoring area using a transmitting device, a receiving device, and a terminal device held by a moving body. There, the transmitting device transmits a radio wave of a predetermined pulse signal in the predetermined monitoring area, the receiving device, at least the radio wave obtained by reflecting the radio wave in the radio wave and the monitoring area. Receiving one, the receiving device,
Detecting the electric field strength characteristic value of the received radio wave, the receiving device, when there is a predetermined variation in the detected electric field strength characteristic, transmits a radio wave for confirmation in the monitoring area,
When the terminal device receives the confirmation radio wave, it transmits a response radio wave that is assigned to the terminal device and indicates identification data, and the reception device determines whether the response radio wave is received and the response. Based on the identification data indicated by the radio wave for use, the legitimacy of the object that has moved causing the fluctuation is determined.

Further, the monitoring method of the fourth invention is preferably such that the receiving device does not receive the response radio wave or the identification data indicated by the response radio wave is not registered in advance. First, it is determined that the cause of the fluctuation is due to an unauthorized object.

The monitoring system according to the fifth aspect of the invention is a monitoring system for monitoring the movement of an object within a predetermined monitoring area, and transmitting radio waves of a predetermined pulse signal within the predetermined monitoring area. A device, a receiving device, and a terminal device that is held by a mobile body and, when receiving a confirmation radio wave, has a terminal device that transmits a response radio wave that is assigned to the terminal device and indicates identification data. An antenna for receiving at least one of the radio waves and the radio waves obtained by reflecting the radio waves in the monitoring area; an electric field intensity characteristic value detecting means for detecting an electric field intensity characteristic value of the received radio waves; Variation detecting means for detecting whether or not there is a predetermined variation in the detected electric field strength characteristic value, and confirmation radio wave transmitting means for transmitting the confirmation radio wave within the monitoring area when the predetermined variation is present. And before Has a presence or absence of the reception of radio waves for the response, on the basis of the identification data indicated by the radio wave for the response, and a monitoring means for determining the validity of the object causes the change.

The receiving device of the sixth invention is a receiving device for monitoring the movement of an object within a predetermined monitoring area,
An antenna for receiving at least one of a radio wave transmitted by a transmitter and a radio wave obtained by reflecting the radio wave within the monitoring area, and an electric field strength characteristic value detection for detecting an electric field strength characteristic value of the received radio wave Means for detecting whether or not the detected electric field strength characteristic value has a predetermined fluctuation, and, if there is the predetermined fluctuation, the confirmation device within the monitoring area. Confirmation radio wave transmitting means for transmitting the radio wave of, the presence or absence of reception of the response radio wave, and the monitoring means for judging the legitimacy of the object causing the fluctuation based on the identification data indicated by the response radio wave. Have and.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the accompanying drawings. First Embodiment FIG. 1 is an overall configuration diagram of a monitoring system 1 of this embodiment. As shown in FIG. 1, the monitoring system 1 includes, for example, a transmitter 10 and a receiver 20. Transmitter 10
The receiver 20 is installed in the monitoring area 18 or in the vicinity of the monitoring area 18. In the present embodiment, for example, as shown in FIG. 1, a static body 14 such as a pillar or a shelf and a moving body 13 such as a machine tool or a robot are installed in the monitoring area 18.

The embodiment is an embodiment corresponding to the first to third inventions. Here, the monitoring system 1 corresponds to the monitoring system of the present invention, the transmitting device 10 corresponds to the transmitting device of the present invention, and the receiving device 20 corresponds to the receiving device of the present invention. The monitoring area 18 corresponds to the monitoring area of the present invention.

[Transmitting Device 10] The transmitting device 10 has an antenna 11, and transmits a radio wave of a pulse signal modulated by the ultra wideband impulse communication system into the monitoring area 18 via the antenna 11. Here, the ultra wideband impulse communication system is a wireless technology that can effectively use frequency resources,
Using weak radio waves of a signal consisting of a pulse train with a very fine pulse width (for example, 1 ns or less), for example, about 100 Mb
Baseband transmission is performed at ps. The occupied bandwidth is set to the center frequency (for example, 1 GHz to 10 GH)
It is a short-range wireless communication system having a bandwidth on the order of GHz such that the value divided by z) becomes approximately 1. In this embodiment, by transmitting the radio wave of the pulse signal modulated by the ultra-wideband impulse communication method into the monitoring area 18, the radio wave is continuously transmitted using the FM-CW wave (chirp) as in the conventional case. Power saving can be achieved compared to the case. Further, by using the intermittent pulse, it is possible to reduce the influence on the operation of the electronic device in the monitoring area 18.

[Reception Device 20] As shown in FIG. 1, the reception device 20 includes, for example, an antenna 16, a switch unit 21,
Electric field strength characteristic value detection unit 22, fluctuation detection unit 23, timer 2
4, a confirmation radio wave transmission unit 25, a response radio wave reception unit 26, and a notification unit 27. Here, the antenna 16 corresponds to the antenna of the present invention, the electric field strength characteristic value detecting section 22 corresponds to the electric field strength characteristic value detecting means of the present invention, and the fluctuation detecting section 23 corresponds to the fluctuation detecting means of the present invention. The confirmation radio wave transmission unit 25 corresponds to the confirmation radio wave transmission unit of the present invention, and the notification unit 27 corresponds to the monitoring unit of the present invention.

The antenna 16 receives the radio wave transmitted from the antenna 11 and the radio wave obtained by reflecting the radio wave in the monitoring area 18. Specifically, in the state where there is no moving object in the monitoring area 18, the antenna 16 transmits the radio wave S1 transmitted from the antenna 11 as shown in FIGS.
0 directly through the path P_1 to the radio wave S10_1 (S1
6_4). At this time, the antenna 1
The radio wave S10 transmitted from the antenna 11 is received via the paths P_3 and P_4 as radio waves S10_3 (S16_3) and S10_4 (S16_4) reflected by the moving body 13 and the stationary body 14, respectively. on the other hand,
As shown in FIG. 3 and FIG. 4, when the moving body 12 is in the monitoring area 18, the antenna 14 uses the radio wave S16.
In addition to _1, S16_3, S16_4, the radio wave S10 transmitted from the antenna 11 is received as the radio wave S10_2 (S16_2) reflected by the intruder 12 via the route P_2.

The switch section 21 normally receives the electric wave S16 received by the antenna 16 from the electric field strength characteristic value detecting section 2 for example.
2 and the response radio wave reception unit 26 are set to output. The switch unit 21 is controlled by a control unit and a fluctuation detection unit 23 (not shown), for example, and confirms a radio wave S25.
Is set to output the confirmation radio wave S25 from the confirmation radio wave transmission unit 25 to the antenna 16.

The electric field strength characteristic value detecting section 22 includes the antenna 1
6 detects the electric field strength of the radio wave S16 received, and the electric field strength characteristic value data S22 showing the characteristic of the detected electric field strength.
To generate. The electric field strength characteristic detection unit 22 outputs the electric field strength characteristic value data S22 (first electric field strength characteristic value of the present invention) to the variation detection unit 23. Here, the electric field strength characteristic value data S22 is data in which the relationship between the electric field strength and time of the radio wave S16 detected by the electric field strength characteristic detecting unit 22 is digitized, for example, shown in FIGS. 5 and 6. Here, FIG.
As shown in FIGS. 1 and 2, the case where there is no moving object in the monitoring area 18 is shown. Further, FIG. 6 shows a case where the moving body 12 is in the monitoring area 18, as shown in FIGS. 3 and 4. 5 and 6, electric field intensity patterns EI_1, EI_2, EI_3, EI_4 are radio waves S16_1, S16_2, S received by the antenna 16.
16_3 and S16_4, respectively.

The electric field strength characteristic detecting section 22 is, for example, as shown in FIG.
And, as shown in FIG. 6, among the detected electric field intensities, the average value of the electric field intensities obtained in a predetermined period is calculated as electric field intensity characteristic value data S22. Note that the electric field strength characteristic detection unit 22 may calculate the electric field strength characteristic value data S22 by performing statistical processing other than averaging. At this time, the electric field intensity pattern EI_3 shown in FIGS. 5 and 6 is a pattern corresponding to the radio wave S16_3 reflected by the moving body 13 shown in FIGS. 1 and 3, and changes according to the movement of the moving body 13. Therefore, when calculating the electric field strength characteristic value data S22, the electric field strength characteristic detection unit 22 excludes the portion of the electric field strength pattern EI_3 (the portion of the period d shown in FIGS. 5 and 6) from the calculation target. As a result, the moving body 13
It is possible to prevent the notification unit 27 from erroneously determining that the variation of the electric field strength caused by the movement of the object is caused by the intruder 12. Note that the electric field strength characteristic detection unit 22 may detect, as the electric field strength characteristic value data S22, delay profile characteristic value data indicating the time characteristic of the electric field strength of the radio wave S16 shown in FIGS. 5 and 6. In this case, in FIGS. 5 and 6, the electric field intensity patterns EI_1, EI_2,
The EI_3 and EI_4 are radio waves S1 received by the antenna 16 via the paths P_1 to P_4 shown in FIG.
6_1, S16_2, S16_3, and S16_4 correspond to the time characteristics of the electric field strength, respectively. That is, the delay profile characteristic value data (electric field intensity characteristic value data S22) is configured by a plurality of electric field intensity patterns obtained from the result of reception with a delay time corresponding to the distance of the corresponding path.

The fluctuation detecting section 23 is the electric field strength characteristic detecting section 2.
The difference between the electric field strength characteristic value data S22 input from 2 and the reference electric field strength characteristic value data stored in advance is obtained,
It is determined whether or not the difference exceeds a predetermined threshold value that is defined in advance. When it is determined that the difference is exceeded, the counting operation by the timer 24 is activated and a transmission instruction is output to the confirmation radio wave transmission unit 25. Further, the fluctuation detecting unit 23 sends the confirmation radio wave S25 from the confirmation radio wave transmission unit 25 to the antenna 16
The switch unit 21 is set to output to. The fluctuation detecting unit 23 receives the input electric field strength characteristic value data S22.
And the electric field strength characteristic value data S22 input a predetermined time ago.
Then, it is determined whether or not the difference exceeds a predetermined threshold value defined in advance, and when it is determined that the difference is exceeded,
The transmission operation may be output to the confirmation radio wave transmission unit 25 while the counting operation by the timer 24 is activated.

The timer 24 starts counting under the control of the fluctuation detecting section 23 and outputs the count value S24 to the timer 24.

The confirmation radio wave transmission unit 25 outputs the confirmation radio wave S25 to the switch unit 21 when the transmission instruction is input from the fluctuation detection unit 23.

The response radio wave receiving unit 26 inputs the radio wave S16 received by the antenna 16 via the switch unit 21,
It is determined whether or not the received radio wave S16 is a response radio wave, and when it is determined to be a response radio wave, a notification to that effect is output to the notification unit 27.

The notification unit 27 determines whether or not the notification is input from the response radio wave reception unit 26 within a predetermined time after transmitting the confirmation radio wave S25 based on the count value S23 input from the timer 24. If it is determined that no information has been input, the security monitoring center 31 via the communication network 30
The notification signal S27 is transmitted to.

[Security Monitoring Center 31] Upon receiving the notification signal S27 via the communication network 30, the security monitoring center 31 outputs at least one of an image and a sound indicating that there is an intruder in the monitoring area 18. To do.

[Terminal Device 80] The terminal device 80 is held by, for example, the legitimate mobile unit 12. FIG. 7 is a functional block diagram of the terminal device 80. As shown in FIG. 7, the terminal device 80 includes, for example, a confirmation radio wave reception unit 81, a response radio wave transmission unit 82, a switch unit 83, and an antenna 84.
Have. The confirmation radio wave receiving unit 81 inputs the radio wave received by the antenna 84 via the switch unit 83, and determines whether or not the received radio wave is the confirmation radio wave S25,
When it is determined that the radio wave S25 is for confirmation, the transmission instruction S81 is output to the response radio wave transmission unit 82. Upon receiving the transmission instruction from the confirmation radio wave receiving unit 81, the response radio wave transmitting unit 82 outputs a response radio wave to the antenna 84 via the switch unit 83. The switch unit 83 outputs the radio wave received by the antenna 84 to the confirmation radio wave reception unit 81, and outputs the radio wave output by the response radio wave transmission unit 82 to the antenna 84.

Hereinafter, an operation example of the monitoring system 1 will be described. [First Operation Example] In the operation example, as shown in FIG.
An operation example of the monitoring system 1 in the case where there is a valid mobile body 12 holding the terminal device 80 in the monitoring area 18 will be described. FIG. 8 is a diagram for explaining the operation example. Step ST11: As shown in FIGS. 3 and 4, the transmission device 10 transmits the radio wave S10 to the monitoring area 18 within the monitoring area 18.
Send inward intermittently. Then, the radio wave S10
(S16_1), and the radio wave S10 is the intruder 12,
Radio wave S16 obtained by reflection from moving body 13 and stationary body 14
_2, S16_3, S16_4 are received by the antenna 16 of the receiving device 20.

Step ST12: In the electric field strength characteristic detecting section 22 of the receiving device 20, as shown in FIG. 5, the radio waves S16_1, S16_2, S1 received by the antenna 16 are received.
The electric field strengths of 6_3 and S16_4 are detected, and the plurality of electric field strengths detected at different timings are digitized by averaging or the like to generate electric field strength characteristic value data S22. At this time, in the electric field strength characteristic detection unit 22, for example, among the electric field strengths detected as shown in FIG. 5, the electric field strength pattern EI_3 that changes according to the movement of the moving body 13.
Is excluded from the calculation target of the averaging. The electric field strength characteristic value data S22 is output from the electric field strength characteristic detecting unit 22 to the fluctuation detecting unit 23.

Step ST13: In the fluctuation detecting section 23 of the receiving apparatus 20, the difference between the electric field strength characteristic value data S22 input from the electric field strength characteristic detecting section 22 and the reference electric field strength characteristic value data stored in advance is generated. It

Step ST14: In the fluctuation detecting section 23 of the receiving device 20, it is judged whether or not the difference generated in step ST13 exceeds a predetermined threshold value defined in advance. If it is judged that the difference exceeds the predetermined threshold value, step ST15 is executed. If not, the process returns to step ST11.

Step ST15: The fluctuation detecting section 23 activates the counting operation of the timer 24 and outputs a transmission instruction to the confirmation radio wave transmitting section 25. As a result, the timer 24 starts counting. In addition, from the confirmation radio wave transmission unit 25, the switch unit 21 and the antenna 1
A radio wave S25 for confirmation is transmitted into the monitoring area 18 via 6. When the terminal device 80 receives the confirmation radio wave S25, the terminal device 80 transmits a response radio wave. The response radio wave is received by the antenna 16 of the receiving device 20, and is output to the response radio wave receiving unit 26 via the switch unit 21. From the response radio wave reception unit 26, the notification of the reception is output to the notification unit 27.

Steps ST16 and ST17: Receiver 2
The notification unit 27 of 0 receives the response radio wave reception unit 26 within a predetermined time.
When the notification is input from, the process ends. That is, no notification is given.

[Second Operation Example] In this operation example, as shown in FIG. 9, an operation example of the monitoring system 1 when there is an unauthorized mobile body 12a that does not hold the terminal device 80 in the monitoring area 18 explain. In this operation example, the processes of steps ST11 to ST15 shown in FIG. 8 are performed in the same manner as the above-described first operation example. However, the moving body 12a is the terminal device 8
Since 0 is not held, the response radio wave corresponding to the confirmation radio wave S25 transmitted by the receiving device 20 is not transmitted. Therefore, the notification unit 27 determines in step ST16 that the response radio wave is not received, and further, in step S16.
It is determined that the predetermined time has elapsed at T17, and step ST1
Proceed to the process of 8. In the process of step ST18, the notification signal S27 is transmitted from the notification unit 27 of the reception device 20 to the security monitoring center 31 via the communication network 30.
Thus, when the security monitoring center 31 receives the notification signal S27 via the communication network 30, the security monitoring center 1
At least one of an image and a sound indicating that there is an unauthorized intruder in 8 is output.

As described above, according to the monitoring system 1, since the transmitter 10 intermittently transmits the electric wave of the pulse signal of the ultra wideband impulse communication system, the FM-CW wave (chirp) is generated as in the conventional case. Power saving can be achieved compared to the case where radio waves are continuously transmitted using. Further, by using the intermittent pulse, it is possible to reduce the influence on the operation of the electronic device in the monitoring area 18. Further, according to the monitoring system 1, the directivity of the antenna 11 and the antenna 16 can be independently set by separately providing the transmitting device 10 and the receiving device 20, and the detection accuracy of the intruder and the intruder The position detection accuracy of can be improved.

Further, according to the monitoring system 1, the moving body 13
The portion of the electric field intensity pattern EI_3 shown in FIGS. 5 and 6 which fluctuates due to the movement of the electric field is not reflected in the electric field intensity characteristic value data S22 and S22 to be compared. Report the change
It is possible to avoid erroneously determining that 7 is caused by the intruder 12. Therefore, the intruding object can be detected with high accuracy. By increasing the accuracy of intruder detection in this way, false alarms can be eliminated. According to the monitoring system 1, the terminal device 80 is held by the legitimate mobile body 12 in the surveillance area 18, so that an alarm is not issued depending on the electric field fluctuation by the legitimate mobile body 12, and the rogue mobile body 12 is not activated.
The alarm can be issued only for the electric field fluctuation due to a.

Second Embodiment In the present embodiment, the condition is that the ID of the valid terminal device 80 is registered in the receiving device in advance, and the receiving device receives the confirmation radio wave from the terminal device 80 having the registered ID. The case where control is performed so that no alarm is issued will be described. This embodiment is an embodiment corresponding to the fourth to sixth inventions.

FIG. 10 shows the monitoring system 10 of this embodiment.
1 is an overall configuration diagram of 1. In FIG. 10, constituent elements given the same reference numerals as those in FIGS. 1 and 3 are the same as those described in the first embodiment. [Terminal Device 180] FIG. 11 shows the terminal device 1 shown in FIG.
It is a functional block diagram of 80. As shown in FIG. 11, the terminal device 180 includes a confirmation radio wave reception unit 81, a response radio wave transmission unit 182, a switch unit 83, an antenna 84, and an ID storage unit 85. The confirmation radio wave receiving section 81 and the switch section 83 are the same as those described in the first embodiment. I
The D storage unit 84 stores the identification data ID previously assigned to the terminal device 180. Response radio wave transmission unit 182
When the transmission instruction S81 is input from the confirmation radio wave reception unit 81, the control radio wave reception unit 81 outputs a response radio wave indicating the ID read from the ID storage unit 85 to the switch unit 83. The response radio wave is transmitted via the switch unit 83 and the antenna 84.

[Reception Device 120] As shown in FIG.
The receiving device 120 includes, for example, the antenna 16, the switch unit 21, the electric field strength characteristic value detecting unit 22, the fluctuation detecting unit 23, the timer 24, the confirmation radio wave transmitting unit 25, the response radio wave receiving unit 95,
It has an ID confirmation unit 96 and a notification unit 97. Here, the antenna 16 corresponds to the antenna of the present invention, the electric field strength characteristic value detecting section 22 corresponds to the electric field strength characteristic value detecting means of the present invention, and the fluctuation detecting section 23 corresponds to the fluctuation detecting means of the present invention.
The confirmation radio wave transmission unit 25 corresponds to the confirmation radio wave transmission unit of the present invention, and the ID confirmation unit 96 and the notification unit 97 correspond to the monitoring unit of the present invention. In FIG. 10, the switch unit 21, the electric field strength characteristic value detection unit 22, the fluctuation detection unit 23, the timer 24, and the confirmation radio wave transmission unit 25, which are denoted by the same reference numerals as in FIG. 1, are the same as those described in the first embodiment. is there.

When the radio wave S16 is the response radio wave transmitted by the terminal device 180, the response radio wave receiving section 95 outputs the ID indicated by the response radio wave to the ID confirmation section 96. The ID confirmation unit 96 has a list of IDs of the terminal devices 180 held by a valid mobile body. ID confirmation unit 96
Determines whether the ID input from the response radio wave reception unit 95 exists in the list, and if it determines that the ID exists, outputs a notification to that effect to the notification unit 97.

The notification unit 27 determines whether or not the notification is input from the response radio wave reception unit 26 within a predetermined time after transmitting the confirmation radio wave S25 based on the count value S23 input from the timer 24. If it is determined that no information has been input, the security monitoring center 31 via the communication network 30
The notification signal S97 is transmitted to.

An operation example of the monitoring system 101 shown in FIG. 10 will be described below. FIG. 12 is a flowchart for explaining the operation example. The processes of steps ST21 to ST24 are basically the same as the processes of steps ST11 to ST14 of the first embodiment described with reference to FIG.

Step ST25: The fluctuation detecting section 23 activates the counting operation by the timer 24 and outputs a transmission instruction to the confirmation radio wave transmitting section 25. As a result, the timer 24 starts counting. In addition, from the confirmation radio wave transmission unit 25, the switch unit 21 and the antenna 1
A radio wave S25 for confirmation is transmitted into the monitoring area 18 via 6. Upon receiving the confirmation radio wave, the terminal device 180 transmits a response radio wave indicating the ID of the terminal device 180.

Step ST26: The response radio wave is
It is received by the antenna 16 of the receiving device 20, and the switch unit 2
It is output to the response radio wave reception unit 95 via 1. When the response radio wave is input, the response radio reception unit 95 outputs the ID indicated by the response radio to the ID confirmation unit 96. Then, the process proceeds to step ST29. On the other hand, when the response radio wave receiving unit 95 does not input the response radio wave, the process proceeds to step ST27.

Step ST27: The notification section 97 of the receiving device 120 performs the processing of step ST28 if the notification is not input from the ID confirmation section 96 within a predetermined time, and if the predetermined time has not elapsed, the notification section 97 proceeds to step ST26. Return to processing.

Step ST28: The notification section 97 outputs a notification signal S97 to the security monitoring center 31 via the communication network 30.

Step ST29: ID of the receiving device 120
The confirmation unit 96 receives the response radio wave reception unit 95 in step ST26.
It is determined whether or not the ID input from is in the ID list registered in advance.

Step ST30: When the ID confirmation section 96 determines that the ID input in step ST29 is not in the ID list, it outputs a notification to that effect to the notification section 27. As a result, the process of step ST28 is performed and the notification is performed. On the other hand, when the ID confirmation unit 96 determines that the ID input in step ST29 is in the ID list, the reception device 120 ends the process. As a result, no notification is given.

As described above, the monitoring system 101
Also, the same effect as that of the monitoring system 1 of the first embodiment can be obtained. Further, according to the monitoring system 101, the ID of the legitimate terminal device 180 is registered in the receiving device, and an alarm is issued on condition that the receiving device receives the confirmation radio wave from the terminal device 180 having the registered ID. It becomes possible to control not to do it.

The present invention is not limited to the above embodiments. For example, in the above-described embodiment, the case where the transmission device 10 and the reception device 20 are housed in different housings is illustrated, but the present invention stores the transmission device 10 and the reception device 20 in a single housing. Good. Further, in the above-described embodiment,
The transmitter 10 uses the ultra-wideband impulse communication method to transmit the radio wave S.
Although the case where 10 is transmitted is illustrated, in addition, OFDM (O
rthogonal Frequency Division Multiplexing) method,
The radio wave S10 may be transmitted by a spread spectrum method or the like.

Further, in the above-mentioned embodiment, the notification unit 27.
Although the case where the intruder 12 detects the intruder 12 is described as an example, the alarm device provided inside the monitoring area 18 or outside the monitoring area 18 may be activated.

Further, in the above-described embodiment, the case where the monitoring is performed by using one set of the transmitting device 10 and the receiving devices 20 and 120 has been exemplified, but a plurality of sets of the transmitting device 10 and the receiving device 2 are used.
You may monitor using 0,120.

[0055]

As described above, according to the present invention,
It is possible to provide a monitoring system and a method thereof that can save power and a receiving device. Further, according to the present invention, it is possible to provide a monitoring system and method that can detect an intruding object in the monitoring area with high accuracy, and a receiving device. Further, according to the present invention, it is possible to provide a monitoring method, a system thereof, and a receiving device capable of distinguishing an unauthorized intruder from a moving body such as an authorized person in the monitoring area.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of a surveillance system according to a first embodiment of the present invention, showing a case where there is no intruder in a surveillance area.

FIG. 2 is a diagram for explaining a path of a radio wave when there is no intruder in the monitoring area.

FIG. 3 is an overall configuration diagram of a monitoring system according to the first embodiment of the present invention, and shows a case where there is a legitimate moving body within the monitoring area.

FIG. 4 is a diagram for explaining a path of a radio wave when a moving body exists in a monitoring area.

FIG. 5 is a diagram of FIG. 1 when there is no moving object in the monitoring area.
FIG. 6 is a diagram for explaining electric field strength characteristics detected by the electric field strength characteristic detection unit shown in FIG.

FIG. 6 is a diagram illustrating a case where a moving object is present in the monitoring area.
FIG. 6 is a diagram for explaining electric field strength characteristics detected by the electric field strength characteristic detection unit shown in FIG.

FIG. 7 is a functional block diagram of a terminal device held by the moving body shown in FIG.

FIG. 8 is a flow chart for explaining the operation of the monitoring system according to the first embodiment of the present invention.

FIG. 9 is a diagram for explaining a case where an unauthorized moving body exists in the monitoring area.

FIG. 10 is an overall configuration diagram of a monitoring system according to a second embodiment of the present invention.

11 is a functional block diagram of a terminal device held by the moving body shown in FIG.

FIG. 12 is a flow chart for explaining the operation of the monitoring system according to the second embodiment of the present invention.

[Explanation of symbols]

1, 101 ... Monitoring system, 10 ... Transmission device, 11 ... Antenna, 13 ... Moving body, 14 ... Static body, 16 ... Antenna, 2
0, 120 ... Receiving device, 22 ... Electric field strength characteristic detecting section, 2
3 ... Fluctuation detection unit, 24 ... Timer, 25, 95 ... Confirmation radio wave transmission unit, 26 ... Response radio wave reception unit, 27, 97 ... Notification unit,
30 ... communication network, 31 ... security monitoring center, 8
0,180 ... Terminal device, 96 ... ID confirmation unit

Claims (19)

[Claims] 1. A monitoring method for monitoring the movement of an object within a predetermined monitoring area using a transmitting device, a receiving device, and a terminal device held by a moving body, wherein the transmitting device comprises: Transmitting a radio wave of a predetermined pulse signal in the predetermined monitoring area, the receiving device receives at least one of the radio wave and the radio wave obtained by reflection of the radio wave in the monitoring area, the reception The device detects the electric field strength characteristic value of the received radio wave, and when the receiving device has a predetermined variation in the detected electric field strength characteristic value, transmits a confirmation radio wave in the monitoring area. However, when the terminal device receives the confirmation radio wave, it transmits a response radio wave, and the reception device, based on the presence or absence of the response radio wave, of the object that causes the fluctuation. A monitoring method to determine legitimacy. 2. The receiving device, when the response radio wave is not received within a predetermined time after transmitting the confirmation radio wave, determines that the object causing the fluctuation is an unauthorized intruder. The monitoring method according to claim 1, wherein the determination is performed. 3. The receiving device compares a first electric field strength characteristic value detected in a state where there is no intruding object in the monitoring area with a second electric field strength characteristic value detected at the time of monitoring, The monitoring method according to claim 1, wherein it is determined whether or not there is the predetermined variation based on the result of the comparison. 4. The receiving device obtains a difference between the first electric field strength characteristic value and the second electric field strength characteristic value, and when the difference exceeds a predetermined threshold value, the predetermined electric field strength characteristic value is determined. The monitoring method according to claim 3, wherein it is determined that there is a change. 5. The monitoring method according to claim 1, wherein the receiving device averages a plurality of electric field strengths detected at predetermined different timings to generate the electric field strength characteristic value. 6. The receiving device, when receiving a plurality of radio waves corresponding to a single pulsed radio wave transmitted by the transmitting device, detects an intruder within the monitoring area from among the plurality of received radio waves. The monitoring method according to claim 1, wherein the electric field strength characteristic value is calculated using electric field strengths of radio waves other than radio waves received at a predetermined timing corresponding to a reflected wave from a moving object that is not. 7. The receiving device obtains a difference between the detected electric field strength characteristic value and an electric field strength characteristic value detected a predetermined time before the electric field strength characteristic value, and the difference is a predetermined threshold value. The monitoring method according to claim 1, wherein when the value exceeds a value, it is determined that there is the predetermined fluctuation. 8. The monitoring method according to claim 1, wherein the receiving device detects, as the electric field strength characteristic value, a delay profile characteristic value indicating a time characteristic of the electric field strength of the received radio wave. 9. The monitoring method according to claim 1, wherein the receiving device performs a notification process or an alarm generation process when the object that causes the fluctuation is determined to be invalid. 10. The monitoring method according to claim 1, wherein the pulse signal is an ultra wideband impulse signal. 11. A monitoring system for monitoring the movement of an object within a predetermined monitoring area, comprising: a transmitting device for transmitting a radio wave of one predetermined pulse signal into the predetermined monitoring region; a receiving device; The receiving device has a terminal device that is held by the body and that transmits a response radio wave when receiving a confirmation radio wave, and the receiving unit is a radio wave obtained by reflecting the radio wave and the radio wave in the monitoring area. An antenna for receiving at least one of the above, an electric field strength characteristic value detecting means for detecting an electric field strength characteristic value of the received radio wave, and detecting whether or not there is a predetermined variation in the detected electric field strength characteristic value. Fluctuation detecting means, when there is the predetermined fluctuation, confirmation radio wave transmitting means for transmitting the confirmation radio wave in the monitoring area, based on the presence or absence of reception of the response radio wave, Positive of the factor object Monitoring system and a monitoring means for determining the sex. 12. A receiving device for monitoring movement of an object within a predetermined monitoring area, wherein at least one of a radio wave transmitted by a transmitting device and a radio wave obtained by reflecting the radio wave within the monitoring area. An antenna for receiving the electric field strength, an electric field strength characteristic value detecting means for detecting the electric field strength characteristic value of the received radio wave, and the receiving device, whether or not there is a predetermined variation in the detected electric field strength characteristic value. A fluctuation detecting means for detecting, a confirmation radio wave transmitting means for transmitting the confirmation radio wave in the monitoring area when there is the predetermined variation, and a reception radio wave for reception corresponding to the confirmation radio wave. A receiver having a monitoring unit that determines the validity of the object that causes the fluctuation based on the presence or absence. 13. The receiving apparatus according to claim 12, wherein the electric field strength characteristic value detecting means detects, as the electric field strength characteristic value, a delay profile characteristic value indicating a time characteristic of the electric field strength of the received radio wave. 14. A monitoring method for monitoring the movement of an object within a predetermined monitoring area using a transmitting device, a receiving device, and a terminal device held by a moving body, wherein the transmitting device comprises: A radio wave of a predetermined pulse signal is transmitted within a predetermined monitoring area, the receiving device receives at least one of the radio wave and the radio wave obtained by reflecting the radio wave within the monitoring area, and the receiving device Detects the electric field strength characteristic value of the received radio wave, the receiving device, when there is a predetermined variation in the detected electric field strength characteristic, transmits a radio wave for confirmation in the monitoring area, When the terminal device receives the confirmation radio wave, it transmits a response radio wave that is assigned to the terminal device and indicates identification data, and the reception device receives the response radio wave and the response. And the identification data indicated by the radio wave for Based on the monitoring method of determining the validity of the object performing the motion which causes the change. 15. When the receiving device does not receive the response radio wave, or when the identification data indicated by the response radio wave is not registered in advance, the cause of the fluctuation is an unauthorized object. The monitoring method according to claim 14, wherein the monitoring method determines that 16. The monitoring method according to claim 14, wherein the receiving device detects, as the electric field strength characteristic value, a delay profile characteristic value indicating a time characteristic of the electric field strength of the received radio wave. 17. A monitoring system for monitoring the movement of an object within a predetermined monitoring area, comprising: a transmitting device for transmitting a radio wave of a predetermined pulse signal into the predetermined monitoring area; a receiving device; and a moving body. When a confirmation radio wave is received, the terminal device transmits a response radio wave that is assigned to the terminal device and indicates identification data, and the receiving device has the radio wave and the monitoring area within the monitoring area. An antenna for receiving at least one of the electric waves obtained by reflecting the electric wave, an electric field strength characteristic value detecting means for detecting an electric field strength characteristic value of the received electric wave, and a predetermined electric field strength characteristic value for the detected electric field strength characteristic value. Fluctuation detection means for detecting whether or not there is a fluctuation, confirmation radio wave transmission means for transmitting the confirmation radio wave within the monitoring area when there is the predetermined fluctuation, and reception of the response radio wave. With or without Monitoring system and a monitoring means on the basis of the identification data radio wave for the response indicates, it determines the validity of the object causes the change. 18. A receiving device for monitoring movement of an object within a predetermined monitoring area, wherein at least one of a radio wave transmitted by a transmitting device and a radio wave obtained by reflecting the radio wave within the monitoring area. An antenna for receiving the electric field strength, an electric field strength characteristic value detecting means for detecting the electric field strength characteristic value of the received radio wave, and the receiving device, whether or not there is a predetermined variation in the detected electric field strength characteristic value. Variation detecting means for detecting, a confirmation radio wave transmitting means for transmitting the confirmation radio wave in the monitoring area when there is the predetermined variation, presence or absence of reception of the response radio wave, and the response radio wave And a monitoring unit that determines the legitimacy of the object that causes the fluctuation based on the identification data indicated by. 19. The receiving apparatus according to claim 18, wherein the electric field strength characteristic value detecting means detects, as the electric field strength characteristic value, a delay profile characteristic value indicating a time characteristic of the electric field strength of the received radio wave.