JP2000228790A - Remote monitor system and event occurrence position estimate device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a remote monitor system by which a range of an occurred event is quickly figured out on the occurrence of falling rocks or the like as a sign of a large scale accident and detailed information to the utmost can be acquired from the range. SOLUTION: A data collection computer 12 detects occurrence of falling rocks from an output of a cable sensor installed in a tunnel A and discriminates a rough position of the occurrence. A communication computer 13 uses a portable telephone set 15 or the like to send control information to a monitor camera 101 or the like to allow the camera 101 to photograph a still picture around the estimated position. This still picture is sent to a host computer 24 in a management office 20.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a remote monitoring system for remotely monitoring a rock fall in a tunnel and predicting the occurrence of a rock fall accident and an event occurrence position estimating apparatus suitable for the remote monitor system.

[0002]

2. Description of the Related Art Before a falling rock or a rock collapse occurs on a rock slope, a breaking sound or a small falling sound often occurs. In addition, it has been pointed out that small-scale rock fall precedes especially in large-scale rock collapse. If such precursory destruction phenomena can be detected early, it becomes possible to predict the occurrence of an accident such as a large-scale rock collapse of a tunnel, for example, and to take measures to avoid damage.

[0003] From such a viewpoint, studies on techniques for estimating the position of a falling rock or a collapse on a rock slope along a mountain or a coastal road or the position of a falling rock at a tunnel unwinding part are being actively conducted. Japanese Patent Application Laid-Open No. 9-280
Japanese Patent Publication No. 906 discloses one of the results of this kind of technical research, in which a plurality of cable sensors are arranged in a grid pattern so as to cover the inner surface of a structure such as a tunnel, and an electric signal is analyzed from each cable sensor. Discloses a system for specifying the position and magnitude of the epicenter of vibration caused by falling rocks.

[0004]

According to the technique disclosed in Japanese Patent Laid-Open No. 9-280906, the position of the epicenter and the magnitude of the vibration can be specified. There is a problem that it is necessary to process a huge amount of information obtained from.
In addition, in order to determine the possibility of a large-scale accident, detailed information such as the state of the wall surface at the place where the rock falls is required, but such information is obtained only from the electrical signals obtained from the cable sensor. It is difficult to obtain detailed information.

The present invention has been made in view of the circumstances described above. When a rockfall or the like occurs as a precursor to a large-scale disaster, the present invention quickly narrows down the range of the occurrence location. It is an object of the present invention to provide a remote monitoring system capable of acquiring as detailed information as possible and an event occurrence position estimating device suitable for the remote monitoring system.

[0006]

SUMMARY OF THE INVENTION The present invention provides a plurality of cable sensors laid on an object to be monitored and a position estimating means for estimating a position where a predetermined event has occurred based on output signals of the plurality of cable sensors. Remote monitoring, comprising: an image transmitting unit that captures an image of the monitored object near the position estimated by the position estimating unit and transmits the captured image to a managing unit that manages the monitored object. System.

Further, according to the present invention, the lengths are different from each other,
A plurality of cable sensors laid on the object to be monitored in a bundle and a position estimating means for estimating a position where a predetermined event has occurred based on output signals of the plurality of cable sensors. Is provided.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing the overall configuration of a remote monitoring system according to an embodiment of the present invention.
This remote monitoring system uses the tunnel A in FIG. 1 as a monitoring target. Inside the tunnel A, a plurality of cable sensors laid on the inner wall of the eaves so as to extend in the circumferential direction of the eaves, and a plurality of cable sensors laid on the inner wall of the eaves so as to extend in a direction orthogonal to the eaves. And a grid-like cable sensor group 1 consisting of In addition to the lattice-like cable sensor group 1, a cable sensor group (not shown) for estimating an epicenter is laid in the tunnel A.
This cable sensor will be described later. At the entrance of the tunnel A, an abnormality occurrence bulletin board 2 by an electric bulletin board is installed.

Near the tunnel A, a surveillance camera 101 of the still image transmission system and a mobile phone 102 connected thereto are installed. Here, the surveillance camera 10
Reference numeral 1 denotes a unit for photographing an image near the entrance of the tunnel A or inside the lane, and has a mechanism for adjusting the photographing range (the photographing direction and the focal length). The mobile phone 102 is a mobile phone 25 in the management office 20 described later.
In cooperation with the monitoring camera 101 and the host computer 2
4 is a means for establishing a two-way communication line with the C.4. In the present embodiment, the host computer 24 is connected via the two-way communication line established in this manner.
Control of surveillance camera 101 and surveillance camera 1
The video information (still image information) obtained from 01 is transferred to the host computer 24.

In FIG. 1, only one surveillance camera 101 is shown in order to prevent the drawing from being complicated, but in this embodiment, the tunnel A is scattered so that a wide range of still images can be obtained. A similar monitoring camera is installed in the computer, and video information obtained from these cameras is also transmitted to the host computer 24 as necessary.

An installation box 10 is provided near the tunnel A. In the installation box 10, a data logger 11, a data recording computer 12, a communication computer 13, a satellite mobile phone 14, A mobile phone 15 is provided.

The data logger 11, under the control of the data recording computer 12, controls the electrical signals obtained from the lattice-like cable sensor group 1 laid in the tunnel A and the epicenter range estimation cable sensor group (not shown). Is sampled, and the sampled data (digital signal) is obtained, and the configuration is as shown in FIG.

As shown in FIG. 2, the data logger 11
A / D converters 111-1 to 111-x of a plurality of channels
, A switch unit 112, and an A / D conversion data comparison control unit 113.

The A / D converters 111-1 to 111-x are:
Each analog signal output from each of the cable sensors constituting the lattice-like cable sensor group 1 and the hypocenter range estimation cable sensor group (not shown) is converted into a digital signal (sample data) according to a common sampling clock.

Each of the A / D converters 111-1 to 111-1
-X has an A / D conversion data comparison unit 111a. These A / D conversion data comparison units 111a include:
A predetermined trigger level is given from the A / D conversion data comparison control unit 113. A / D converters 111-1 to 111
Each A / D conversion data comparison unit 111a in −x
The sample data obtained by the conversion is compared with a trigger level, and when the sample data level exceeds the trigger level, a recording start instruction is issued to the A / D conversion data comparison control unit 11.
Send to 3.

The switch unit 112 controls each A according to switching control information given from the data recording computer 12.
This is a unit for switching whether to supply the sample data obtained from the / D converter to the A / D conversion data comparison control unit 113.

The A / D conversion data comparison control unit 113 receives a recording start instruction from one of the A / D conversion data comparison units 111a of the A / D converters 111-1 to 111-x. The sample data obtained from each A / D converter after that point is sent to the data recording computer 12. The data recording computer 12 stores the sample data of each channel sent from the data logger 11 in the built-in memory in this way.

FIG. 3 shows an example of an output signal waveform of a cable sensor corresponding to a certain channel. The data logger 11 and the data recording computer 1 described above are shown in FIG.
The second function is explained. As shown in this figure,
Sample data of the cable sensor output before exceeding the trigger level is invalidated. However, for example, tunnel A
When a rock falls at a certain place in the area, a signal waveform corresponding to this is output from any of the cable sensors, and when the level exceeds the trigger level, a sample data sequence from that point on is recorded by the data recording computer 12. It is done.

The communication computer 13 in FIG.
This is a means for distributing sample data and the like recorded by the data recording computer 12 to related organizations.
The communication computer 13 uses the satellite mobile phone 14 or the mobile phone 15 to make a call connection with related parts to form a communication path for transmitting various information.

Now, the data recording computer 12
In addition to the function of recording the sample data described above, it has a function of estimating the approximate position of the epicenter based on each output signal level obtained from the group of cable sensors for estimating the epicenter and generating a necessary command.

Here, this function will be described with reference to FIG. As shown in FIG. 4, a boring hole 2 is formed in a vertical direction along the wall surface of the quay at a portion near the quay at the entrance of the tunnel A. Further, a boring hole 3 is also formed in the ceiling portion of the backwalk of the tunnel A from the entrance of the tunnel to the back. The boring holes 2 and 3 have a plurality of cable sensors for estimating a focal point range, which are bundled with a plurality of cable sensors having different lengths.
S and 3S are inserted respectively.

The source area estimation cable sensor group 2S is
For example, it is composed of four cable sensors having different lengths. The wall surface of the quay is divided into an A range, a B range, a C range, and a D range depending on how many of these cable sensors are present. Here, for example, when there is a hypocenter in the D range, a high-level electrical signal is obtained only from the cable sensor that receives the impact sound 1 from this hypocenter, and the level of the electrical signal obtained from the other cable sensors is almost 0. is there. Also, for example, when the epicenter is in the C range, a high-level electric signal is obtained only from the cable sensor to which the impact sound 2 from the epicenter reaches, and the level of the electric signal obtained from the other cable sensors is almost 0. is there. The same applies to the range B and the range A.

As described above, when the range in which the epicenter exists differs, the combination of the cable sensors that can obtain an electric signal with a large level differs. The data recording computer 12 determines the magnitude of the peak level of the sample data of each channel (four channels in the case of the example of FIG. 4) obtained from the epicenter range estimation cable sensor group 2S, and determines the magnitude of the peak data of the sample data. When there is one channel, the range where the epicenter exists is specified, such as the range D when there are two channels, the range C when there are two channels, the range B when there are three channels, and the range A when there are four channels. The data recording computer 12 includes an epicenter estimation cable sensor group 3 inserted into the ceiling of the tunnel A.
The same processing is performed for the output signal of S, and tunnel A
Specify the section where the epicenter exists in each section obtained by dividing the backwalk into appropriate lengths. Then, a photographing instruction and control information for photographing the still image of the section specified in this way by an appropriate monitoring camera 101 are generated and transmitted to the communication computer 13. The photographing instruction and the control information are sent by the communication computer 13 and the mobile phone 14 to the monitoring camera 101 provided corresponding to the section.

Further, the data logger 1 according to the present embodiment
1. The data recording computer 12 and the communication computer 13 perform an alarm transmission function of determining an impact level detected by each cable sensor and sending an alarm corresponding to the impact level to a person concerned. FIG. 5 is a block diagram showing the alarm transmission function in terms of hardware.

In FIG. 5, the impact level judging device 1
Reference numeral 21 represents a part of the functions of the data logger 11 and the data recording computer 12 as hardware. The mobile monitoring device 122 represents a part of the function of the communication computer 13 by hardware.

The impact level judging device 121 uses its A / D
The conversion unit 121A (corresponding to the data logger 11) generates sample data from each output signal of each cable sensor laid in the tunnel A. Then, for the largest sample data obtained from the A / D conversion unit 121A, the shock level determination unit 121B of the shock level determination device 121 converts the sample data into five preset level ranges (hereinafter, determination level 1). To 5) are determined. The relay control unit 121C
It has five contacts that are closed according to the determination result by the impact level determination unit 121B. That is, the contact is closed when the level of the sample data belongs to the determination level 1, the contact is closed when it belongs to the determination level 2,..., The contact is closed when it belongs to the determination level 5.

Port monitoring unit 1 of mobile monitoring device 122
22A monitors which contact of the relay control unit 121C is closed. Then, the message processing unit 122B
Selects a warning message corresponding to the closed contact from several types of warning messages stored in advance based on the monitoring result, that is, a warning message corresponding to the judgment level of the impact level, and converts it to an audio signal. I do.

Communication control unit 12 of mobile monitoring device 122
2C has a calling number table that stores the calling number of the other party to be called, such as the calling number of the mobile phone owned by the manager of the tunnel A. And
Upon receiving the voice signal from the message processing unit 122B, the communication control unit 122C calls all the calling numbers in the calling number table and transmits the voice signal to each called communication partner. It should be noted that, besides transmitting the alarm as a voice as described above, for example, a radio paging receiver may be called to send an alarm based on character information.
FIG. 1 shows a radio paging receiver 30 of the administrator of tunnel A.
A state in which a warning message indicating that "A tunnel rock fall has occurred" is sent to 0 is shown. The above is the details of each device in the installation box 10 in FIG.

In FIG. 1, the management office 20 is provided at a position away from the tunnel A. The management office 20 includes a communication computer 21 and a mobile phone 22.
, A data analysis computer 23, a host computer 24 of the still image transmission system, and a mobile phone 25.

The communication computer 21 is a portable telephone 2
2, a call connection can be made between the related parts and various information can be exchanged. One of the communication partners of the communication computer 21 is the communication computer 13 in the installation box 10 described above. As described above, the communication computer 13 has a function of transmitting the sample data and the like recorded by the data recording computer 12 to an associated organization. Sample data and the like transmitted from the computer 13 can be received and supplied to the data analysis computer 23 via the LAN.

The data analysis computer 23 obtains sample data recorded from the lattice-like cable sensor group 1 by the communication computer 21 when a rock falls in the tunnel A, and analyzes the sample data. It is a means to evaluate the location of the epicenter and the magnitude of the vibration caused by falling rocks. The method of estimating the position of the epicenter and the magnitude of the vibration is described in detail in, for example, JP-A-9-280906.

The host computer 24 is a portable telephone 2
5 is a means for making a call connection with the mobile phone 102 on the surveillance camera 101 side, acquiring video information of a still image from the surveillance camera 101, and displaying it on a display. The above is the details of each device in the management office 20.

The mobile communication network 30 and the communication satellite 40 in FIG. 1 are means for configuring a communication path between the devices described above. In FIG. 1, reference numerals 31 and 32 denote radio base stations of the mobile communication network 30, and reference numeral 41 denotes a ground station that relays communication between the communication satellite 40 and the mobile communication network 30.

Next, the operation of the present embodiment will be described on the assumption that a falling rock occurs in the tunnel A. First, a falling rock occurs in tunnel A, and the vibration generated at the falling rock position is the lattice-like cable sensor group 1 (FIG. 1) laid in tunnel A, the epicenter range estimation cable sensor groups 2S and 3S.
When transmitted to (FIG. 4), an electrical signal is output from each of these cable sensors and supplied to the data logger 11 in the installation box 10. The data logger 11 performs A / D conversion of the output signal of each cable sensor. When the level of the sample data after the A / D conversion exceeds the trigger level, a recording start instruction is issued, and the data recording computer 12 starts recording of each sample data. With this as an opportunity, the following three types of processing (1) to (3) are performed in parallel.

(1) Transmission and Analysis of Sample Data Acquired from Lattice Cable Sensor Group 1 (See Arrow P in FIG. 1) When the recording of sample data by the data recording computer 12 is started, the communication computer 13 is started. Calls the mobile phone 22 in the management office 20 by the satellite mobile phone 14 or the mobile phone 15 and establishes a communication line with the communication computer 21 in the management office 20 via each of these mobile phones. Establish. And
The communication computer 13 includes the grid-like cable sensor group 1
Is transmitted from the data recording computer 12 to the communication computer 21 via the communication line.

In the management office 20, the sample data is received by the communication computer 21 and supplied to the data analysis computer 23. Then, the data analysis computer 23 generates image information indicating the rock fall position and the magnitude of the vibration from the sample data, and displays the image information on the display.

(2) Estimation of the section where the epicenter exists and transmission of a still image in the section (see arrow Q in FIG. 1) The data recording computer 12 is obtained from the epicenter estimation cable sensor groups 2S and 3S. Based on the sample data, the section in which the rockfall position is present is estimated, and control information (designation of the monitoring camera for capturing, direction of the monitoring camera, focal length) for photographing this section is determined. Notify.

Upon receiving this notification, the communication computer 13 uses the satellite mobile phone 14 or the mobile phone 15 to connect to a monitoring camera (for example, the monitoring camera 101 in FIG. 1) that performs photography. The mobile phone 102) is called to establish a communication line with the monitoring camera. Then, the communication computer 13 performs remote control of the direction, the focal length, and the like of the surveillance camera via the communication line, and instructs the surveillance camera to photograph a section in which it is estimated that a falling rock has occurred. After the end of this instruction, the communication computer 13 disconnects the communication line.

Next, the communication computer 13 is connected to the portable telephone 2 by the satellite portable telephone 14 or the portable telephone 15.
5 to establish a communication line with the host computer 24 of the still image transmission system. Then, the communication computer 13 notifies the host computer 24 of the monitoring camera that has given the shooting instruction.

Upon receiving this notification, the host computer 24 calls the mobile phone connected to the monitoring camera and establishes a communication line with the monitoring camera. Then, the host computer 24 receives the video information of the still image in the section where it is estimated that the rock has fallen from the surveillance camera via this communication line, and displays the video on the display.

The operator can check the state of the wall surface near the location where the rock fall has occurred from this image. At this time, if necessary, the operator performs remote control of the surveillance camera from the host computer 24 side, performs shooting again by changing the shooting range, etc., receives a still image from the surveillance camera side, and displays the still image on the display. be able to.

(3) Sending an alarm (see arrow R in FIG. 1) In parallel with the above-described processes, the data logger 11, the data recording computer 12, and the communication computer 1
3 executes the processing as the impact level determination device 121 and the mobile monitoring device 122 already described with reference to FIG. As a result, the mobile phone or the radio paging receiver of the manager in charge of tunnel A is called, and an alarm message corresponding to the degree of vibration is sent. This warning message is also sent to the abnormality occurrence bulletin board 2 at the entrance of the tunnel,
It will be displayed on the bulletin board.

While the embodiment of the present invention has been described above, this embodiment is merely an example, and various modifications can be made without departing from the spirit of the present invention. For example, the following modifications are conceivable.

<Modification 1> Data recording computer 1
The surveillance camera 2 may estimate the approximate location of the epicenter based on the sample data acquired from the grid-like cable sensor group 1, and the surveillance camera may capture a still image near the estimated location. Specifically, of the plurality of cable sensors laid in the circumferential direction of the lining of the tunnel A, the cable sensor from which the highest level of sample data was obtained and the cable sensor laid in a direction orthogonal to the circumferential direction of the lining of the tunnel. A method is conceivable in which a cable sensor from which the largest level of sample data has been acquired among a plurality of cable sensors is obtained, and an intersection position of these two cable sensors is set as an estimated position of the epicenter.

<Modification 2> Information indicating the estimated location of the epicenter may be included in the warning message and sent to a mobile phone or a radio paging receiver.

<Modification 3> In the above embodiment, the still image obtained by the surveillance camera is transmitted by calling the mobile phone of the surveillance camera from the host computer 24, but the photographing is completed. The surveillance camera may call the host computer using the mobile phone and transmit a still image. In the above-described embodiment, the host computer 24 captures a still image from the surveillance camera after the communication computer 13 gives a shooting instruction to the surveillance camera. The camera may be notified to the host computer 24, and the host computer 24 may remotely control the surveillance camera to capture an image and capture a still image.

<Modification 4> In the above embodiment, the surveillance camera sends a still image near the epicenter to the host computer. However, a moving image may be sent.

<Modification 5> The hypocenter range estimation cable sensor group is used not only for estimating a rock fall position in a tunnel as in the above embodiment, but also along an important underground object such as a gas or oil transport pipe. It may be laid and used to estimate the position of this underground buried object when an impact is applied to the position.

[0049]

As described above, according to the remote monitoring system according to the present invention, a plurality of cable sensors laid on a monitored object and a predetermined event based on each output signal of the plurality of cable sensors. Position estimating means for estimating the occurrence position of the object, and a still image transmitting means for photographing a still image of the monitored object near the position estimated by the position estimating means and transmitting the still image to a managing means for managing the monitored object In the event that a rock falls as a precursor to a large-scale disaster, the range of the location can be quickly narrowed down, and the possibility of an accident occurring can be accurately determined from still images in that range This has the effect. Further, according to the event occurrence position estimating device of the present invention, there is an effect that the occurrence position of a falling rock can be estimated with a simple configuration.

[Brief description of the drawings]

FIG. 1 is a diagram showing an overall configuration of a remote monitoring system according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a data logger according to the embodiment.

FIG. 3 is a waveform diagram illustrating an operation of the data logger according to the first embodiment.

FIG. 4 is a diagram illustrating a method of estimating a section of an epicenter using an epicenter range estimation cable sensor group according to the embodiment;

FIG. 5 is a block diagram showing a hardware of an alarm transmission function according to the embodiment;

[Explanation of symbols]

A: Tunnel, 1 ... Grid cable sensor group, 2 ...
... Abnormality notice board, 10 ... Installation box, 11 ... Data logger, 12 ... Data recording computer, 13
…… Communication computer, 14 …… Satellite mobile phone, 1
Reference numeral 5: mobile phone, 101: monitoring camera for still image transmission system, 102: mobile phone, 20: administration office, 21: communication computer, 22: mobile phone, 23: data analysis computer , 24 ... a host computer of a still image transmission system, 25 ... a mobile phone, 30 ... a mobile communication network, 31, 32 ... a base station,
40 communication satellite, 41 ground station, 300 paging receiver.

 ──────────────────────────────────────────────────続 き Continuing from the front page (71) Applicant 599017254 Hisashi Konno 2-6-4-1 Nakanoshima, Toyohira-ku, Sapporo-shi, Hokkaido (71) Applicant 599017265 Kyoto Sato 3-6-7, 2-Jo Nishi, Sumikawa, Minami-ku, Sapporo, Hokkaido (71) Applicant 599017276 Masaru Kobayashi 12-2-16 Minami 20-Jo Nishi, Chuo-ku, Sapporo-city, Hokkaido (71) Applicant 599017287 Hiroshi Mitamura 3-1-1-18, Hachiken 9-Jo-Higashi, Nishi-ku, Sapporo, Hokkaido (71) Applicant 599017298 Hidetoshi Osaka 2-7-2 Kotoni, Nishi-ku, Sapporo, Hokkaido (71) Applicant 599017302 Yasuhiro Sasaki 6-12-30, Atsubetsu-minami, Sapporo, Hokkaido 12-31 (71) Applicant 597016033 4-13-1 (71) Applicant 599017313 Toyoaki Kitajima 127-17-1, Kita 24-Jo Nishi, Kita-ku, Sapporo City, Hokkaido (72) Inventor Masashi Sato, Kiyota, Sapporo, Hokkaido Hiroka 10-Jo 3-Chome 1-18 (72) Inventor Kenji Nakai Hokkaido, Sapporo City, Chuo-ku Minami 20-Jo Nishi 12-chome 2-23 (72) Inventor Hisashi Konno, Hokkaido 72) Inventor Kyo Sato 3-6-7 Sumikawa Nishi 3-chome, Minami-ku, Sapporo-city, Hokkaido (72) Inventor Masaru Kobayashi 12-2-16 Minami 20-jo Nishi, Chuo-ku, Sapporo, Hokkaido, Japan (18) Inventor Hidetoshi Osaka Nishi-ku, Nishi-ku, Sapporo-shi, Hokkaido 2-2-7-chome, 7-chome, Nishi-ku, Hokkaido, Japan (72) Inventor Yasuhiro Sasaki, 6-12-30, Atsubetsu-minami, Atsubetsu-ku, Sapporo, Hokkaido, Japan (72) Inventor Masuyuki Uhirahira 4-3-1-1, Nishi-no-sato Higashi, Kitahiroshima-shi, Hokkaido (72) Inventor Kazuo Hirama 3-1-1, Kita 3-Jo Nishi, Chuo-ku, Sapporo, Hokkaido 5 NTT Hokkaido Mobile Communications (72) Inventor Kimihiro Yamamoto 3-1, Kita 3-Jo Nishi, Chuo-ku, Sapporo, Hokkaido 5 NTT Hokkaido Mobile Communication Network Co., Ltd. In-house (72) Inventor Kenji Urata 3-1, Kita 3-Jo Nishi, Chuo-ku, Sapporo, Hokkaido 5 Within NTT Hokkaido Mobile Communications Network Co., Ltd. (72) Inventor Toyoaki Kitajima Kita-ku, Kita-ku, Sapporo, Hokkaido Nishi 12-chome 1-7-515

Claims (7)

[Claims] 1. A plurality of cable sensors laid on an object to be monitored, position estimating means for estimating a position where a predetermined event has occurred based on output signals of the plurality of cable sensors, and estimation by the position estimating means. An image transmitting means for taking an image of the monitored object near the designated position and transmitting the image to a managing means for managing the monitored object. 2. The remote monitoring system according to claim 1, wherein the plurality of cable sensors are different from each other in length, and are a group of cable sensors laid on the object to be monitored in a bundle. system. 3. The remote monitoring system according to claim 1, wherein the plurality of cable sensors are a group of cable sensors arranged in a grid extending vertically and horizontally to cover an object to be monitored. 4. The image transmission means has a plurality of monitoring cameras arranged discretely, and the position estimating means provides a mobile communication network or communication to a monitoring camera corresponding to the estimated occurrence position of a predetermined event. The remote monitoring system according to any one of claims 1 to 3, wherein a shooting instruction and control information are transmitted via a satellite. 5. An event detecting means for detecting occurrence of a predetermined event based on an output signal of the cable sensor and generating warning information, and a transmission number table for storing a call number of a portable wireless terminal of a call partner. Communication means for transmitting warning information generated by said event detection means to a portable wireless terminal corresponding to a call number stored in said transmission number table. A remote monitoring system according to any one of the preceding claims. 6. The remote monitoring system according to claim 5, wherein said event detecting means generates said alarm message according to a level of an output signal of said cable sensor. 7. A plurality of cable sensors laid on the object to be monitored in bundles having different lengths, and a position where a predetermined event has occurred is determined based on output signals of the plurality of cable sensors. An event occurrence position estimating device comprising: a position estimating means for estimating the position.