Optical fiber perimeter security system end point detection method based on short-time energy and zero-crossing rate

Abstract

The invention provides an optical fiber perimeter security system end point detection method based on short-time energy and the zero-crossing rate. Signals with disturbance and noise are cut into short-time information frames in a window function method, the short-time energy ratio and the zero-crossing rate of each frame are calculated, information whose short-time energy ratio and zero-crossing rate meet certain threshold values respectively is found out, then the information is judged comprehensively and the best end point values meeting the two conditions simultaneously are found out. According to the optical fiber perimeter security system end point detection method based on the short-time energy and the zero-crossing rate, an improved short-time energy method and a short-time zero-crossing rate method are combined and used for detecting end points more accurately, effective disturbance information is extracted, the aim of saving time and internal memory is achieved, and meanwhile the aim of improving positioning precision is achieved.

Description

technical field [0001] The invention belongs to the technical field of sensing and detection, and is particularly applied in an optical fiber perimeter security positioning system for detecting the endpoint of an effective signal. The optical fiber perimeter security positioning system is a sensing system that uses interferometric distributed optical fibers as the sensing medium. Background technique [0002] With the continuous progress of human society and the rapid development of science and technology, more and more attention has been paid to safety monitoring, whether it is in fields related to the national economy and people's livelihood such as electric power, water conservancy, and petrochemicals, or in areas with high security requirements such as camps, airports, and prisons, Perimeter security monitoring has been widely used. With the gradual increase of perimeter security systems, the positioning accuracy of monitoring has become the object of more attention. ...

AI Technical Summary

Problems solved by technology

Since the system detects only a small proportion of useful purpose signals during the signal detection process, most of the time it receives silent signals of no value, so processing all the signals is useless and wasteful. A lot of time and memory, and because the sensing optical fiber is generally laid out outdoors, it is easily affected by the environment, such as wind and rain, etc. These noises will cause certain interference to the signal, and will also cause certain errors in subsequent calculations

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