WO-2026094510-A1 - MONITORING SYSTEM, MONITORING DEVICE, MONITORING METHOD, AND PROGRAM

WO2026094510A1WO 2026094510 A1WO2026094510 A1WO 2026094510A1WO-2026094510-A1

Abstract

Provided is a monitoring system that includes: a detection position acquisition means that acquires a first detection position at which vibration was detected at a first optical fiber cable and a second detection position at which vibration was detected at a second optical fiber cable that is spaced at an interval from the first optical fiber cable; and a crossing angle estimation means that estimates the crossing angle at which a mobile body has crossed the first optical fiber cable and the second optical fiber cable on the basis of the first detection position and the second detection position.

Inventors

TANAKA, TOSHIAKI

Assignees

日本電気株式会社

Dates

Publication Date: 20260507
Application Date: 20250930
Priority Date: 20241029

Claims (10)

A detection position acquisition means for acquiring a first detection position where vibration is detected in a first optical fiber cable, and a second detection position where vibration is detected in a second optical fiber cable located at a distance from the first optical fiber cable. A cross-sectional angle estimation means estimates the cross-sectional angle when a moving object crosses the first optical fiber cable and the second optical fiber cable based on the first detection position and the second detection position, including, A monitoring system.
A monitoring system according to claim 1, The first optical fiber cable and the second optical fiber cable are arranged parallel to each other. The aforementioned cross-sectional angle estimation means is The difference between the first detection position and the second detection position in the longitudinal direction of the first optical fiber cable, The distance between the first optical fiber cable and the second optical fiber cable, Based on this, the cross-sectional angle is estimated. A monitoring system.
A monitoring system according to claim 1, The system further includes a crossing velocity estimation means for estimating the crossing velocity when the moving object crosses the first optical fiber cable and the second optical fiber cable, based on the first detection position and its detection time, and the second detection position and its detection time. A monitoring system.
A monitoring system according to claim 3, The system further includes a movement estimation means for estimating the movement of the moving body after it has crossed the first optical fiber cable and the second optical fiber cable, based on the estimation results from the crossing angle estimation means and the estimation results from the crossing velocity estimation means. A monitoring system.
A monitoring system according to claim 4, The motion estimation means estimates the motion of the moving body. This includes estimating at least one of the following: the azimuth angle of the moving object, the origin of the moving object, the destination of the moving object, and the time of arrival of the moving object at its destination. Monitoring system.
A monitoring system according to claim 3, The crossing speed estimation means determines that there is no moving object that has crossed the first optical fiber cable and the second optical fiber cable if the difference between the detection time of the first detection position and the detection time of the second detection position is greater than or equal to a predetermined value. Monitoring system.
A monitoring system according to claim 3, The crossing speed estimation means estimates the type of the moving body based on the estimated crossing speed. A monitoring system.
A detection position acquisition means for acquiring a first detection position where vibration is detected in a first optical fiber cable, and a second detection position where vibration is detected in a second optical fiber cable located at a distance from the first optical fiber cable. A cross-sectional angle estimation means estimates the cross-sectional angle when a moving object crosses the first optical fiber cable and the second optical fiber cable based on the first detection position and the second detection position, including, monitoring equipment.
Computers The system acquires a first detection location where vibration is detected in the first optical fiber cable, and a second detection location where vibration is detected in the second optical fiber cable, which is spaced apart from the first optical fiber cable. Based on the first detection position and the second detection position, the crossing angle when the moving object crosses the first optical fiber cable and the second optical fiber cable is estimated. Monitoring method.
On the computer, A detection position acquisition means for acquiring a first detection position where vibration is detected in a first optical fiber cable, and a second detection position where vibration is detected in a second optical fiber cable located at a distance from the first optical fiber cable. A cross-sectional angle estimation means estimates the cross-sectional angle when a moving object crosses the first optical fiber cable and the second optical fiber cable based on the first detection position and the second detection position, To make it function as program.

Description

Monitoring system, monitoring device, monitoring method, and program This disclosure relates to monitoring systems, monitoring devices, monitoring methods, and programs. Numerous cases of smuggling drugs and other goods across borders are occurring. In particular, some countries have areas without physical barriers such as fences or walls along their borders, such as remote desert regions, and it is necessary to understand the actual situation of border crossings in such areas. The targets of surveillance are moving objects such as people and vehicles, while the surveillance area spans hundreds of kilometers. Methods for monitoring moving objects while covering such a wide area at a realistic cost are extremely limited. For example, low-Earth orbit satellites equipped with visible light or near/far-infrared cameras can detect moving objects over a wide area, but satellites are not always positioned directly over national borders, limiting monitoring opportunities. One effective method is distributed optical fiber sensing technology. In distributed optical fiber sensing technology, distortion, temperature, pressure, and vibration can be detected at any given location along a section of the optical fiber spanning tens of kilometers by measuring the backscattered light from the optical fiber. In other words, by installing optical fiber sensors, including optical fibers, along border fences and walls, it is possible to monitor a section of the border spanning tens of kilometers without power supply. In cases where there are fences or walls along the border, smuggling transactions often take place near these fences or walls, causing moving objects to remain in the vicinity for a certain period of time. Therefore, it is expected that these moving objects can be detected with high reliability. On the other hand, if there are no physical barriers such as fences or walls along the border, moving objects will cross the border in a short time. Even if fiber optic sensors are installed along the border, it will be difficult to distinguish the detection results of moving objects from noise. Furthermore, the speed of the moving object will not be known, making it impossible to obtain sufficient information such as whether the object is a person, a horse, or a high-speed vehicle such as a car. Patent Document 1 discloses a technology for detecting people walking unsteadily on a train platform by installing multiple optical fibers on the platform. To track a moving object that has crossed a national border, especially in areas without roads such as deserts, it is not enough to simply detect that the object has crossed the border; it is also necessary to determine the angle at which the object crossed the border. Therefore, the purpose of this disclosure is to provide a technique for estimating the crossing angle when a moving object crosses an optical fiber cable. A detection position acquisition means for acquiring a first detection position where vibration is detected in a first optical fiber cable, and a second detection position where vibration is detected in a second optical fiber cable located at a distance from the first optical fiber cable. A cross-sectional angle estimation means estimates the cross-sectional angle when a moving object crosses the first optical fiber cable and the second optical fiber cable based on the first detection position and the second detection position, including, A monitoring system will be provided. A detection position acquisition means for acquiring a first detection position where vibration is detected in a first optical fiber cable, and a second detection position where vibration is detected in a second optical fiber cable located at a distance from the first optical fiber cable. A cross-sectional angle estimation means estimates the cross-sectional angle when a moving object crosses the first optical fiber cable and the second optical fiber cable based on the first detection position and the second detection position, including, A monitoring device will be provided. Computers The system acquires a first detection location where vibration is detected in the first optical fiber cable, and a second detection location where vibration is detected in the second optical fiber cable, which is spaced apart from the first optical fiber cable. Based on the first detection position and the second detection position, the crossing angle when the moving object crosses the first optical fiber cable and the second optical fiber cable is estimated. A monitoring method will be provided. On the computer, A detection position acquisition means for acquiring a first detection position where vibration is detected in a first optical fiber cable, and a second detection position where vibration is detected in a second optical fiber cable located at a distance from the first optical fiber cable. A cross-sectional angle estimation means estimates the cross-sectional angle when a moving object crosses the firs