JP2725654B2 - Landslide monitoring system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a landslide monitoring system for detecting a direction of arrival of a transmitted wave to monitor a landslide.

[0002]

2. Description of the Related Art Conventionally, a landslide monitoring system for monitoring a landslide is provided with a Doppler sensor in a place where there is a danger of a landslide, and a falling rock falling in front of the Doppler sensor is detected based on the Doppler effect. The landslide is being monitored.

A conventional example of monitoring a landslide using such a Doppler sensor is disclosed in Japanese Patent Application Laid-Open No. 56-02469.
Japanese Patent Publication No. 6 “Disaster prediction method using Doppler sensor” is known. In this conventional example, information such as a method of installing a Doppler sensor and the presence / absence of falling rocks, the number of falling rocks, the falling speed, and the falling direction due to the Doppler effect using the Doppler sensor can be obtained.

[0004]

However, in the above-mentioned conventional example, since the landslide is monitored only by falling rocks falling in front of the Doppler sensor, the entire location of the landslide cannot be grasped, and accurate landslide data cannot be obtained. It is hard to obtain. In addition, monitoring of landslides requires that a plurality of Doppler sensors be accurately installed on the assumption of a falling position of the falling rock, and the installation work is troublesome. Furthermore, when the terrain fluctuates simultaneously with the landslide and the Doppler sensor moves from the installation location, it cannot measure rockfalls and the like, resulting in a lack of reliability.

The present invention solves the above-mentioned problems in the prior art, and it is possible to accurately measure landslides in a wide range of places, and it is easy to install a detection transceiver for monitoring landslides, and it is not necessary to install such a transceiver. Provided is a landslide monitoring system that does not generate necessary transmissions, reduces interference and power consumption, makes it easy to start up the system again after a landslide occurs, and improves the reliability of monitoring the landslide. .

[0006]

In order to achieve the above object, a landslide monitoring system according to the first aspect of the present invention includes a radio transmitter installed in a place where there is a risk of landslide;
A plurality of direction finding stations for measuring the direction of arrival of the transmission wave from the wireless transmitter, and the position of the wireless transmitter are specified and stored from the intersection of the plurality of receiving directions transmitted by the plurality of direction finding stations. The configuration includes a central monitoring station that monitors a position change by comparing a position measured in the past with a stored position.

A landslide monitoring system according to claim 2 is
A plurality of wireless transmitters installed in a place where there is a risk of landslide and wirelessly transmitting their own identification code, and a plurality of wireless transmitters receiving the identification code transmitted by the wireless transmitter and measuring the arrival direction of the transmitted wave From the intersection of a plurality of receiving directions transmitted by the plurality of direction finding stations, and the position of the wireless transmitter that has received the identification code is specified, and the wireless transmission corresponding to the identification code stored in advance is performed. And a central monitoring station that monitors position fluctuations in comparison with the position of the transmitter and repeats a polling process for sequentially calling the plurality of wireless transmitters after the measurement of the position fluctuations of the plurality of wireless transmitters is completed. .

[0008] A landslide monitoring system according to claim 3 is
The configuration is such that the search station and the central monitoring station are connected by a wired line or a wireless line.

A landslide monitoring system according to claim 4 is
A screen display unit and an alarm unit are provided, the screen display unit divides a place where there is a risk of landslide into an area including the wireless transmitter and displays the screen, and an area in which the position change of the wireless transmitter has occurred, At least black and white inversion, blinking, or screen display in a color different from the surrounding screen color, the degree of disaster determined from the magnitude of position fluctuation is displayed on the screen, and an alarm is issued from the alarm means.

A landslide monitoring system according to claim 5 is
As a configuration for storing the position of the wireless transmitter in which the position change has occurred as a new position, comparing the stored new position with the position of the wireless transmitter at the time of this measurement, and monitoring the new position change. is there.

A landslide monitoring system according to claim 6 is
The wireless transmitter includes a GPS receiver that measures a self-absolute position, a storage unit that previously stores the self-absolute position, and a comparison unit that compares the measured value of the GPS receiver with the self-absolute position of the storage unit. When a position change occurs in the comparison of the means, this position change is wirelessly transmitted to the direction finding station, and the central monitoring station that has received the position change occurrence through the direction finding station, It is configured to call at high frequency.

A landslide monitoring system according to claim 7 is
A storage unit for storing the identification code of the radio transmitter in advance; a reception unit for starting transmission of the identification code stored in the storage unit when receiving a radio paging transmission wave from the central monitoring station; Wireless transmitting means for wirelessly transmitting the identification code from the means, and the direction finding station includes a wireless receiving means for receiving a transmission wave of the identification code from the wireless transmitter, and receiving from an output signal of the wireless receiving means. Code analysis means for analyzing the identification code of the wireless transmitter, the arrival direction measurement means for measuring the arrival direction of the transmission wave from the output signal of the wireless reception means, and the identification code from the identification code analysis means and the arrival direction measurement means. And wireless transmission means for wirelessly transmitting the direction data, wherein the central monitoring station specifies the position of the wireless transmitter receiving the identification code from the intersection of the plurality of reception directions transmitted by the plurality of direction finding stations. Means and knowledge Comparing the position of the wireless transmitter identified by the position measuring unit with the position of the wireless transmitter corresponding to the identification code stored in the storage unit; A position comparing / calculating means for calculating a position change, and a wireless transmitting means for wirelessly transmitting a command for a polling process for sequentially calling the plurality of wireless transmitters after the measurement of the position change of the plurality of wireless transmitters. It is provided as a configuration.

It is preferable that the landslide monitoring system has a configuration in which the wireless transmission means of the central monitoring station frequently calls the wireless transmitter, which has calculated the position change, to the wireless transmitter.

In the landslide monitoring system according to the present invention, a radio transmitter installed in a place where there is a danger of landslides transmits by successive calls from a central monitoring station. The identification code is received by a plurality of direction finding stations, the direction of arrival of the transmitted wave is measured and sent to the central monitoring station, where the position of the wireless transmitter that has received the identification code from the intersection of the reception directions is specified, and The position change corresponding to the terrain change is monitored by comparing with the position of the wireless transmitter corresponding to the identification code stored in advance.

Therefore, it is only necessary to be able to accurately measure landslides in a wide range of places and to install a detection transceiver in an arbitrary area, and to easily install a detection transceiver that monitors landslides. In addition, since the detection transceiver transmits the identification code by a call from the central monitoring station, unnecessary transmission does not occur, no interference occurs when the same frequency is used, and power consumption is reduced. Reduced. Further, even after the occurrence of the landslide, the transmission / reception of the detection transceiver can be performed, and the system can be easily started again after the occurrence of the landslide.

A landslide monitoring system according to claim 3 is
Since the direction finding station and the central monitoring station are connected by a wired line or a wireless line, the degree of freedom in selecting the installation location of the central monitoring station can be obtained.

A landslide monitoring system according to claim 4 is
The area where the position change of the wireless transmitter has occurred is displayed in a different color from the black-and-white inversion, blink or surrounding screen color, and
Since the degree of disaster determined from the magnitude of the position change is displayed on the screen and an alarm is issued, a landslide,
The area is quickly and reliably identified.

A landslide monitoring system according to claim 5 is
Since the position of the wireless transmitter where the position change has occurred is set as a new position and the subsequent position change is measured, accurate measurement is always performed.

Further, in the landslide monitoring system, when a call to the wireless transmitter is made at a high frequency, an area where the position variation has occurred is measured with emphasis on the wireless transmitter that has calculated the position variation. The landslide will be clear.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of a landslide monitoring system of the present invention will be described in detail with reference to the drawings. FIG. 1 is a configuration diagram showing a first embodiment of a landslide monitoring system of the present invention, and FIG. 2 is a block diagram showing an electrical configuration. In FIGS. 1 and 2, this example is a detection method in which a pulse code signal, which is an individual identification code, is arranged at an arbitrary position in a place P where a landslide may occur and is sequentially transmitted based on a received read command. Transceivers 10a, 10
b, 10c, 10d, 10e, 10f, 10g, 10
h, 10i and 10j.

Further, based on pulse code signals as identification codes, which are sequentially transmitted from the detection transceivers 10a to 10j, direction search stations 20a, 20b, and 20c for measuring the direction of arrival of the transmitted wave, Transceiver 10a-
10j, the read command is sequentially transmitted, and a pulse code signal of the identification code, which is a response to the read command, is transmitted to the local search stations 20a to 20c.
A central monitoring station 30 is provided for sequentially capturing data, comparing the measured data with reference position data such as latitude and longitude measured in advance, and monitoring a position change corresponding to a terrain change such as a landslide. Note that the direction finding stations 20a to 20c need at least two stations to detect the direction of arrival of the transmission wave from the detection transceivers 10a to 10j. However, if three or more stations are installed, the detection of the direction of arrival becomes high. Can be done with precision.

FIG. 3 is a block diagram showing a detailed configuration of the detection transceivers 10a to 10j. In FIG. 3, the detection transceivers 10a to 10j have the same configuration, and include an omnidirectional transmission / reception antenna Ant1, an antenna duplexer 12 for using the transmission / reception antenna Ant1 for both transmission and reception, and an antenna sharing device. Central monitoring station 3 through device 12
And a receiving unit 13 for starting transmission of the identification code when a read command (radio wave) of a pulse code signal, which is an identification code from 0, is received.

A memory 1 for transmitting a pulse code signal, which is its own identification code, by a start signal from the receiving unit 13
4 and a pulse code signal from the memory 14 and modulate a high frequency signal of a predetermined frequency to the antenna duplexer 1.
2 to antenna search stations 20a to 20c from antenna Ant1
And a power supply 16 using a battery for supplying a direct current to each unit.

FIG. 4 is a block diagram showing a detailed configuration of the direction finding stations 20a to 20c. In FIG. 4, this search station 2
0a to 20c receive the transmission waves of the pulse code signals from the detection transceivers 10a to 10j, and receive an array antenna Ant2 for detecting the omnidirectional reception azimuth and a reception signal from the array antenna Ant2, for example. ,amplification,
Frequency converted and demodulated data (pulse code)
And a signal analysis unit 201 that analyzes the pulse code of the demodulated data output by the reception unit 200 and specifies the detection transceivers 10a to 10j that have received the transmission wave.

Further, when the signal analysis unit 201 analyzes the pulse code, the pulse code database 202 for transmitting the pulse code data stored in advance for each of the detection transceivers 10a to 10j and the demodulated data output from the reception unit 200 , The phase difference of each array element of the array antenna Ant2 is obtained and the received radio wave (detection transceivers 10a to 10j)
And a measurement data transmission unit 204 for transmitting the azimuth data measured by the radio arrival direction measurement unit 203 to the central monitoring station 30 via a wired line.

FIG. 5 is a block diagram showing a detailed configuration of the central monitoring station 30. In FIG. 5, the central monitoring station 30
A non-directional antenna Ant3 for transmitting a read command (radio wave) for sequentially reading a pulse code signal as an identification code to the detection transceivers 10a to 10j;
A position measuring unit 301 for calculating the azimuths of the detection transceivers 10a to 10j corresponding to the identification codes transmitted from the direction finding stations 20a to 20c.

Further, a pre-stored identification code reads the position data such as the latitude and longitude of the corresponding detection transceivers 10a to 10j, and compares the positions with the position comparison unit 302 for detecting a position change. A disaster distribution storage for displaying the degree of disaster determined on the map based on the magnitude of the positional fluctuation of the detection transceivers 10a to 10j detected by the position comparing unit 302 and displaying the position fluctuation on the screen. Unit 304.

An alarm unit 305 for issuing an alarm when the position of the detection transceiver 10a to 10j changes.
And the detection transceivers 10a to 10j again upon completion of the measurement.
Transmission instructing unit 306 for instructing transmission of a read command for sequentially reading out a pulse code signal of an identification code corresponding to
And a detection / transmitter position database 307 for storing the positions of the detection / transmitters 10a to 10j installed in advance, and a transmission unit 308 for wirelessly transmitting a read command to the detection transceivers 10a to 10j in accordance with an instruction from the transmission instruction unit 306. have.

Next, the operation of the first embodiment will be described. 1 to 5, in FIG.
10j, the central monitoring station 30 sequentially receives the read command of the pulse code signal of the identification code transmitted by the antenna Ant1, and the received signal is input to the receiving unit 13 through the antenna duplexer 12. The receiving unit 13 amplifies, frequency-converts, and demodulates the received signal, and activates the memory 14 so as to transmit the identification code in response to the received read command.

A pulse code signal, which is a self-identifying code read from the memory 14, is output to the transmitting unit 15. The transmitting unit 15 modulates the pulse code signal from the memory 14 and transmits a high frequency signal of a predetermined frequency from the antenna Ant1 through the antenna duplexer 12 to the local search stations 20a to 20a.
c.

The detection transceivers 10a to 10j are sequentially
The transmission wave of the pulse code signal to be transmitted is transmitted to three stations
0a to 20c receive simultaneously. In this case, the search station 20
a to 20c are received by the array antenna Ant2, and the received signal is transmitted to the receiving unit 200. Here, for example, amplification,
Frequency converted and demodulated data (pulse code)
Is output to the signal analysis unit 201. The signal analyzing unit 201 refers to the pulse code of the demodulated data output from the receiving unit 200 with the pulse code stored in the pulse code database 202 in advance, and determines the pulse code received this time by any of the detection transceivers 10a to 10j. Determine if there is.

Further, based on the demodulated data output from the receiving unit 200 in the radio wave arrival direction measuring unit 203, the array antenna A
The phase difference between the array elements of nt2 is obtained, and the azimuths of the detection transceivers 10a to 10j are measured from the received radio waves. The azimuth data measured by the radio wave arrival azimuth measuring unit 203 is transmitted from the measurement data transmitting unit 204 to the central monitoring station 30 via the wired line together with the identification codes of the detection transceivers 10a to 10j that have detected the azimuth data.

In the central monitoring station 30, the direction search stations 20a to 20c
The position measurement unit 301 receives the identification codes and the direction data of the detection transceivers 10a to 10j transmitted from the communication device.
In the position measuring section 301, the detection transceivers 10a to 10a-1 corresponding to the identification codes transmitted from the direction finding stations 20a to 20c are provided.
The direction of 0j is calculated. This calculation result is stored in the position comparison unit 30.
2 where the detected transceiver location database 3
For example, position data of, for example, latitude and longitude of the detection transmitter / receivers 10a to 10j corresponding to the identification code stored in advance in 07 is read, and the positions are compared to detect a position change.

FIG. 6 shows the detection transceiver 1 corresponding to the identification code.
It is a figure for explaining calculation of the direction of 0a-10j, and its position change. In FIG. 6, for example, the central monitoring station 3
If the response to the call of “0” is the detection transceiver 10g and the direction data from the direction finding stations 20a to 20c are the solid line, the one-dot chain line, and the two-dot chain line shown in FIG. Of the actual position.

At this point, the measured position on the map of the detecting transceiver 10g at the intersection and the position of the detecting transceiver 10g stored in advance in the detecting transceiver location database 307 are read, and the positions are compared. In FIG. 6, the actual position of the detection transmitter / receiver 10g measured this time is shifted from the position of the detection transmitter / receiver 10g stored in the detection transmitter / receiver position database 307 in advance, and a position change occurs.

As described above, the positions of the detection transceivers 10a to 10j are sequentially compared by the position comparing unit 302, and when a change in the position is detected, the change in the position is displayed on the screen of the display unit 303. At the same time, based on the magnitude of the position fluctuation of the detection transceivers 10a to 10j detected by the position comparison unit 302, the degree of the disaster determined is stored in the disaster distribution storage unit 304 and used for the subsequent countermeasures and the like. In addition, for example, the degree of disaster is displayed on a map of the display unit 303 in characters on the screen.

FIG. 7 is a diagram for explaining a screen display state on the display unit 303. In FIG. 7, in this example, the entire map of the place P shown in FIG. 1 is displayed on the screen by dividing it into an area centered on the detection transceivers 10a to 10j by using the image projection device, and a position change occurs. For example, halftone dots and hatched areas in the figure are displayed on the screen in red or blink, for example. At the same time, the alarm unit 305 issues an alarm.
Thereafter, upon completion of the measurement, the transmission instruction unit 306 instructs the transmission unit 308 to transmit a read command for sequentially reading out the pulse code signals of the identification codes of the detection transceivers 10a to 10j again, and transmits the read command. And the measurement of the position change is started again.

In this case, a read command for frequently reading out the pulse code signal of the identification code is transmitted only to the area of the detection transceivers 10a to 10j in which the position variation has occurred, and the measurement in that area is emphasized. Do it. Also,
By sending the position data of the detection transceivers 10a to 10j having the position fluctuations to the detection transmitter / receiver position database 307, changing the position, and measuring the fluctuation from this position in the future, the measurement is facilitated again. To get started.

As described above, in the first embodiment,
The central monitoring station 30 receives the pulse code signals from the detection transceivers 10a to 10j through the direction finding stations 20a to 20c, calculates the position fluctuation, and monitors the landslide. Therefore, landslides in a wide range of locations can be measured more accurately and reliably than when a landslide is monitored using only a falling rock that falls in front of a conventional Doppler sensor.

In addition, the detection transceivers 10a to 10a
10j may be installed, and the work of installing the detection transceivers 10a to 10j for monitoring the landslide can be easily performed. Further, since the detection transceivers 10a to 10j transmit pulse code signals by polling from the central monitoring station 30, for example, when the same frequency is used without unnecessary transmission occurring for continuous transmission. And the power consumption is further reduced. Further, even after the occurrence of the landslide, the transmission of the detection transceivers 10a to 10j is possible at the position, and the system can be easily started up again.

The position fluctuation of the detection transceivers 10a to 10j is measured by measuring the direction of the radio wave. That is, since relative position fluctuations are measured, absolute accuracy is not required, and system construction is easy. Furthermore, the magnitude of the disaster can be accurately grasped by the central monitoring station 30 distant from the site based on the amount of position fluctuation of the detection transceivers 10a to 10j, and countermeasures can be easily planned. In addition, skilled knowledge and experience are not required, and accurate monitoring can be performed. In addition, continuous automatic observation makes it easier to grasp the anticipated landslide in advance. As a result, landslide monitoring will be more reliable.

Next, a second embodiment will be described. In the second embodiment, the omnidirectional measurement system (GPS: Gl
obal Positioning System (GPS) radio waves are received and their position fluctuations are measured.

FIG. 8 is a block diagram showing the configuration of the second embodiment, and FIG. 9 is a block diagram showing the electrical configuration.
8 and 9, this example is similar to the first embodiment shown in FIG. 1, except that the direction finding stations 20 a to 20 c and the central monitoring station 30
And receives GPS radio waves from four or more sky GPS satellites, measures its absolute position (latitude, longitude, altitude), and transmits it to the direction finding stations 20a to 20c, and
As in the embodiment shown in FIG. 1, the detection transceivers 40a, 40b, 40c, 40d, 40e, 40f, which sequentially transmit the pulse code signals by radio waves to the search stations 20a to 20c.
40g, 40h, 40i, and 40j.

FIG. 10 is a block diagram showing a detailed configuration of the detection transceivers 40a to 40j. 10, the detection transceivers 40a to 40j have the same configuration, and the antenna Ant1, the antenna duplexer 12, the reception unit 13, the memory 14, and the transmission unit 1, as in the first embodiment shown in FIG.
5 and a power supply 16.

Further, an antenna Ant4 for receiving a GPS radio wave from a GPS satellite in the sky,
4 that receives the received signal from the G.4 and outputs demodulated data.
From the PS receiving unit 42 and the demodulated data output by the receiving unit 42, the self-absolute position (latitude,
(Longitude, altitude) calculated, and if it fluctuates from its own absolute position stored in advance, a warning is wirelessly transmitted from the transmitting unit 15 to notify the central monitoring station 30 through the search stations 20a to 20c. It has a calculating unit 43 and a memory 44 for storing self absolute position (latitude, longitude, altitude) data in advance.

Next, the operation of the second embodiment will be described. 8, 9, and 10, a GPS radio wave from a GPS satellite is transmitted to an antenna Ant 4 and a GPS receiver 42.
Through the detection and transmission / reception
The position calculator 43 calculates the self absolute positions of a to j. Then, the detected self absolute position is compared with the self absolute position read from the memory 44, and if a position change occurs here, an alarm is wirelessly transmitted from the transmission unit 15,
The central monitoring station 30 is notified through the search stations 20a to 20c.

In the central monitoring station 30, the local search stations 20a to 20a
During the period in which the notification of the position change of the detection transmitter / receivers 40a to 40j through 20c is not received, the operation is the same as in the first embodiment. That is, the central monitoring station 30 sequentially calls the detection transceivers 10a to 10j, receives the pulse code signals from the response detection transceivers 10a to 10j through the search stations 20a to 20c, and monitors the position fluctuation. ing.

During the monitoring of such a position change, the direction search station 20
a to 20c, the detection transceiver 4 by GPS measurement
0a to 40j, and the position measurement unit 30 shown in FIG.
5 is displayed on the display unit 303 shown in FIGS.
Then, the detection of the position change by the GPS measurement is displayed on the screen in the area of the detection transceivers 40a to 40j. For example, the area is displayed in red and blinking on the screen.

Then, a read command for frequently reading out the pulse code signal of the identification code is transmitted to the area of the detection transceivers 10a to 10j in which the position fluctuation due to the GPS measurement has occurred. Focus on measurement.

As described above, in the second embodiment, as in the first embodiment, the landslide caused by radio waves is monitored and
Since the position fluctuation of the detection transceivers 40a to 40j by the PS measurement is also detected, the reliability of the measurement is further improved.

In the first and second embodiments, the detection transceivers 10a to 10j and 40a to 40j are installed at a place P where a landslide may occur, and the landslide is monitored. The same effect can be obtained with a configuration in which only the detection transceiver is installed at the place P and the position fluctuation is monitored.

Further, the search stations 20a to 20c and the central monitoring station 30 are connected by a wired line such as a public telephone line network, but may be connected by a wireless line. in this case,
The installation location of the central monitoring station 30 can be easily moved.

[0053]

As is apparent from the above description, according to the landslide monitoring system according to the first, second, sixth, and seventh aspects of the present invention, the radio transmitter installed in a place where there is a risk of landslide transmits. Receiving the identification code, and measuring the direction of arrival of the transmitted wave, specifying the position of the wireless transmitter that has received the identification code from the intersection of the reception directions, and performing wireless transmission corresponding to the identification code stored in advance. The position change corresponding to the terrain change is monitored in comparison with the position of the vessel.

Thus, landslides in a wide range of places can be accurately measured, a detection transceiver for monitoring landslides can be easily installed, and unnecessary transmission does not occur, and interference and power consumption can be reduced. . Further, even after the occurrence of the landslide, the transmission of the detection transceiver can be performed, and the system can be easily started again after the occurrence of the landslide, and the reliability of the monitoring of the landslide is improved.

According to the landslide monitoring system of the third aspect, since the direction detection station and the central monitoring station are connected by a wired line or a wireless line, the degree of freedom in selecting the installation location of the central monitoring station is increased. improves.

According to the landslide monitoring system of the fourth aspect, the area where the position change of the radio transmitter has occurred is displayed on the screen in black and white inverted, blinking or in a color different from the surrounding screen color, and the magnitude of the position change is displayed. Since the degree of disaster determined from is displayed on the screen and an alarm is issued, the landslide and its area can be quickly and reliably identified.

According to the landslide monitoring system of the fifth aspect, since the position of the radio transmitter where the position change has occurred is set as a new position and the subsequent position change is measured, accurate measurement can always be performed. Become.

[Brief description of the drawings]

FIG. 1 is a configuration diagram illustrating a first embodiment of a landslide monitoring system of the present invention.

FIG. 2 is a block diagram showing an electrical configuration of the first embodiment.

FIG. 3 is a block diagram showing a detailed configuration of the detection transceiver shown in FIGS. 1 and 2;

FIG. 4 is a block diagram showing a detailed configuration of a direction search station shown in FIGS. 1 and 2;

FIG. 5 is a block diagram showing a detailed configuration of a central monitoring station shown in FIGS. 1 and 2.

FIG. 6 is a diagram for explaining calculation of a direction and a position change of a detection transceiver corresponding to an identification code in the first embodiment.

FIG. 7 is a diagram for explaining a screen display state on the display unit shown in FIG. 2;

FIG. 8 is a block diagram illustrating a configuration of a second embodiment.

FIG. 9 is a block diagram illustrating an electrical configuration of a second embodiment.

FIG. 10 is a block diagram showing a detailed configuration of the detection transceiver shown in FIG.

[Explanation of symbols]

 10a to 10j, 40a to 40j Detection transceiver 13 and 200 Receiver 14 Memory 15 and 308 Transmitter 20a to 20c Search station 30 Central monitoring station 42 GPS receiver 43 Position calculator 44 Memory 201 Signal analyzer 202 Pulse code database 203 Radio wave arrival direction measurement unit 204 Measurement data transmission unit 301 Position measurement unit 302 Position comparison unit 303 Display unit 304 Disaster distribution storage unit 305 Warning unit 306 Transmission instruction unit Ant2 Array antenna

Claims (7)

(57) [Claims] 1. A wireless transmitter installed in a place where there is a risk of landslides; a plurality of direction finding stations for measuring an arrival direction of a transmission wave from the wireless transmitter; A central monitoring station that identifies and stores the position of the wireless transmitter from the intersections of the plurality of receiving directions, and that measures the current position in the past and compares the measured position with the stored position to monitor position fluctuations. A landslide monitoring system characterized by comprising: 2. A plurality of wireless transmitters, which are installed in a place where there is a risk of landslide and wirelessly transmit their own identification code, receive the identification code transmitted by the wireless transmitter, and From a plurality of direction finding stations for measuring the direction of arrival, and from the intersections of the plurality of receiving directions transmitted by the plurality of direction finding stations, the position of the wireless transmitter that has received the identification code is specified, and stored in advance. While monitoring the position change by comparing with the position of the wireless transmitter corresponding to the identification code, and repeating the polling process for sequentially calling the plurality of wireless transmitters after the measurement of the position change of the plurality of wireless transmitters is completed. A landslide monitoring system, comprising: a central monitoring station; 3. The landslide monitoring system according to claim 1, wherein the direction detection station and the central monitoring station are connected by a wired line or a wireless line. 4. The landslide monitoring system according to claim 1, further comprising a screen display means and an alarm means, wherein the screen display means divides a place where there is a danger of landslide into an area including a wireless transmitter. Display the screen, and display the area where the position change of the wireless transmitter has occurred at least in black and white inversion, blink or a color different from the surrounding screen color, and display the degree of disaster determined from the magnitude of the position change. And a warning is issued from the alarm means. 5. The landslide monitoring system according to claim 1, wherein the position of the wireless transmitter in which the position has changed is stored as a new position, and the stored new position and the wireless transmission at the time of the current measurement are stored. The landslide monitoring system according to claim 1, wherein a new position change is monitored by comparing the position with the position of the vessel. 6. The landslide monitoring system according to claim 1, wherein the radio transmitter has a GPS receiver that measures a self-absolute position, a storage unit that stores the self-absolute position in advance, and a measurement of the GPS receiver. And comparing means for comparing the value and the self-absolute position of the storage means.When a position change occurs in the comparison of the comparing means, the position change is wirelessly transmitted to the direction search station, and the position is determined through the direction search station. A landslide monitoring system characterized in that a central monitoring station that has received a change generates a high-frequency call to the wireless transmitter. 7. The landslide monitoring system according to claim 2, wherein the wireless transmitter is configured to store a self-identifying code in advance, and the storage unit to store a radio paging transmission wave from a central monitoring station. Receiving means for initiating transmission of the stored identification code, and wireless transmission means for wirelessly transmitting the identification code from the storage means, wherein the search station transmits a transmission wave of the identification code from the wireless transmitter. Receiving means for receiving, from an output signal of the wireless receiving means, an identification code analyzing means for analyzing an identification code of a received wireless transmitter, and measuring an arrival direction of a transmission wave from an output signal of the wireless receiving means. An arrival direction measurement unit; and a wireless transmission unit that wirelessly transmits the identification code and the direction data from the identification code analysis unit and the arrival direction measurement unit, wherein the plurality of direction finding stations transmit to a central monitoring station. Position measuring means for specifying the position of the wireless transmitter having received the identification code from the intersection of the plurality of receiving directions; storage means for previously storing the position of the wireless transmitter provided with the identification code; Position comparison / calculation means for calculating a position change by comparing the position of the wireless transmitter and the position of the wireless transmitter corresponding to the identification code stored in the storage means; and After measuring the position change,
A landslide monitoring system, comprising: a wireless transmission unit configured to wirelessly transmit a polling command for sequentially calling the plurality of wireless transmitters.