Method for detecting and identifying road surface disaster target under interference of reinforcement high-reflection echo

Abstract

The invention discloses a method for detecting and identifying road surface disaster targets under the interference of reinforcement high-reflection echo. The method mainly comprises target detection and identification algorithms and a reinforcement echo suppression algorithm. The method for detecting and identifying the road surface disaster targets under the interference of the reinforcement high-reflection echo comprises the following steps of: firstly, under the background of interference of the reinforcement high-reflection echo, pre-processing time-space two-dimensional echo data which are received by a ground penetrating radar antenna, detecting targets, determining the transverse position of each target, extracting one-dimensional echo data of each target, and detecting the targets to determine the transverse position of reinforcement; and finally, by using a wave-field separation theory, separating reinforcement echo from target echo, and performing further suppression, re-detection and re-identification to fulfill the aim of detecting and identifying disasters. The method is free from influence of noise and the reinforcement echo, high in detection and identification rate, and the like.

Description

technical field [0001] The invention belongs to the technical field of ground penetrating radar signal processing, and in particular relates to a method for detecting and identifying road surface disaster targets under the interference of strong reflection echoes from steel bars. Background technique [0002] Ground Penetrating Radar (GPR) is a kind of radar that transmits ultra-high frequency (10 6 MHz-10 8 MHz) broadband narrow pulse electromagnetic wave to locate invisible targets or interfaces in the underground medium. The electromagnetic wave is reflected when it encounters a target with changing electromagnetic properties in the medium layer, and is received by the receiving antenna of the ground penetrating radar when it returns to the surface, and the target position, structure, and attributes are interpreted according to its delay, shape, and spectral characteristics. target information. Due to the advantages of non-destructive, fast, strong penetrating power an...

AI Technical Summary

Problems solved by technology

[0004] 1. Instrument noise and system noise;

[0005] 2. Electromagnetic interference from mobile phones, radio stations, etc.;

This is not the case for coherent jammers, which alias with the target of interest echoes in time and space and cannot be separated in frequency domain

Even the echoes of some small targets are much smaller in energy than the echoes of strong reflectors such as reinforced steel bars, resulting in their echoes being buried in the echoes of steel bars, so it is difficult to be detected

All in all, the existence of coherent interference waves makes it very difficult to detect and identify the target of interest, so it is necessary to eliminate as much as possible

Images