Distributed optical fiber sensing positioning method based on zero crossing point analysis

Abstract

The invention discloses a distributed optical fiber sensing positioning method based on zero crossing point analysis. Frequency distribution of disturbance frame signals is obtained with an improved zero crossing point analysis method, and different from zero crossing rate analysis, the distributed optical fiber sensing positioning method is characterized in that average zero crossing amount is not directly calculated, the positions of zero crossing points in the signals are firstly found, the frequency of a certain section of the signals is estimated by comparing signal point numbers between adjacent zero crossing points, and the smaller the signal point numbers between the adjacent zero crossing points are, the higher the frequency of the section of the signals is. Points next to the maximum frequency point serve as effective signal sections to carry out cross-correlation time delay estimation, the effective signal sections contain high-frequency information of the signals and have the wide frequency bandwidth characteristics, and therefore the positioning error is small; meanwhile, due to the fact that the signal processing method based on zero crossing point analysis only contains simple calculation such as adding and subtracting, the calculation complexity is low, the signals with cross-correlation time delay estimation are only small parts of effective sections of a signal, and the signal processing speed is remarkably increased.

Description

technical field [0001] The invention belongs to the technical field of sensing and detection, in particular to a distributed optical fiber sensing positioning method based on zero-crossing point analysis. 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. In areas related to the national economy and people's livelihood such as electric power, water conservancy, and petrochemicals, as well as areas with high security requirements such as camps, airports, and prisons, the perimeter Security monitoring has been widely used, and in civil fields such as large exhibition halls and high-end residential areas, the demand for perimeter security monitoring is also increasing. [0003] Distributed optical fiber sensing technology based on double Mach-Zehnder interference principle uses light wave interference technology to realize intrusion detection...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problems of low positioning accuracy and slow processing speed of the current distributed optical fiber sensing technology positioning algorithm based on the double Mach-Zehnder interference principle, and propose a distributed optical fiber sensor with a fast positioning algorithm based on zero-crossing point analysis. sense localization method

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