Method for detecting target vertex in ground penetrating radar recording profile

Abstract

The invention discloses a method for detecting a target vertex in a ground penetrating radar recording profile. The method comprises steps of: firstly, calculating the one-dimensional energy curve of the preprocessed ground penetrating radar recording profile along a survey line dimension and determining a preset range of the number of the target vertexes according to the number of local maximum points of the curve; then subjecting the preprocessed ground penetrating radar recording profile to edge detection by using an automatic threshold matching way to obtain a binary image and estimating a vertex in the binary image until the preset range of the pre-estimated number of the target vertexes; then, creating a matching template based on the coordinate positions of the vertexes, performing template matching by using the template and the binary image obtained by the edge detection, calculating matching similarity, and discarding the vertexes with matching similarity lower than the threshold to obtain matched vertexes; and filtering the matched vertexes based on a clustering analysis method to remove false vertexes and obtain the detection result of the target vertex. Compared with the prior art, the method has higher detection accuracy in case of a low signal-to-noise ratio.

Description

technical field [0001] The invention belongs to the technical field of ground-penetrating radar detection and application, and in particular relates to a method for detecting target vertices using ground-penetrating radar images. Background technique [0002] Ground Penetrating Radar (GPR) is an effective shallow hidden target detection technology, which uses the reflection and scattering of electromagnetic waves at the discontinuity of the electromagnetic properties of the medium to achieve imaging detection of targets in non-metallic coverage areas. The amplitude and time delay of the GPR echo contain information such as the target position and electromagnetic scattering characteristics. GPR scans space along a one-dimensional survey line, and transmits electromagnetic waves to the underground area at each aperture point of the survey line and receives scattered echoes. One echo data is received at each aperture point, and the echo data received by multiple aperture point...

AI Technical Summary

Problems solved by technology

The above method has high detection accuracy in the case of high signal-to-noise ratio, but in the case of low signal-to-noise ratio, the hyperbolic edge contour of the target in the GPR section record image changes, and its smoothness, symmetry The isocurve feature will be destroyed, so it will cause missed or false detection of the target point, which will directly affect the detection accuracy of the target.

Moreover, the edge detection method needs to manually adjust the threshold, and the real-time performance is poor.

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