Ground penetrating radar underground target positioning method and system based on box spline wavelet framework

A technology of ground penetrating radar and spline wavelet, which is applied in radio wave measurement systems, radio wave reflection/re-radiation, utilization of re-radiation, etc. Simple, Efficient Effects

A technology of ground penetrating radar and spline wavelet, which is applied in radio wave measurement systems, radio wave reflection/re-radiation, utilization of re-radiation, etc. Simple, Efficient Effects

CN107329137AActive Publication Date: 2017-11-07HENAN UNIVERSITY OF TECHNOLOGY
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  • Ground penetrating radar underground target positioning method and system based on box spline wavelet framework
  • Ground penetrating radar underground target positioning method and system based on box spline wavelet framework
  • Ground penetrating radar underground target positioning method and system based on box spline wavelet framework

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Embodiment Construction

[0052] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0053] Aiming at the defects existing in the existing underground target positioning process, the present invention provides a ground penetrating radar underground target positioning method. The method first adopts the box spline wavelet algorithm to decompose the ground penetrating radar echo signal into a spline wavelet frame, and Edge positioning is performed on the decomposition results, and the edge curve of the image is fitted. This step is after the direct wave is removed, so the edge of the reflected wave of the target can be determined; then the first derivative of the curve is calculated, and the point where the derivative is zero is selected as the point of the radar image. Vertex (the point whose first-order derivative is zero is the maximum value point of the edge, so that the vertex of the hyperbola can be selected), and two poi...

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Abstract

The invention relates to a ground penetrating radar underground target positioning method and system based on a box spline wavelet framework. Echo image data of a ground penetrating radar is obtained firstly, a direct wave image in the image is removed, and then a ground penetrating radar signal after preprocessing is obtained; the ground penetrating radar signal after the preprocessing is decomposed through adoption of a box spline wavelet then, and edge positioning is performed on a decomposition result; an edge curve of the image is fitted, and a point at which the derivate of the curve is zero is selected and taken as the vertex of the radar image; and an underground target curve equation is established finally, two points on edges are asymmetrically selected on two branches of the vertex of the radar image, an underground target curve is fitted by utilizing a three-point fitting method, and then positioning of an underground target is achieved. Target positioning precision is improved through the positioning method. For possible shallow layer exploration of a metal pipeline and a nonmetallic pipeline, a false alarm is not easy to generate. An algorithm is simple, operation time is short, and target positioning efficiency is improved.

Description

technical field [0001] The invention relates to a ground penetrating radar underground target positioning method and system based on a box spline wavelet frame, and belongs to the technical field of ground penetrating radar detection. Background technique [0002] Ground-penetrating radar is an effective shallow underground target detection technology developed rapidly in recent decades. It is a non-destructive detection method with fast detection speed, high resolution, convenient and flexible operation, and low detection cost. With many advantages, it has been widely used in the detection and positioning of underground targets, such as cavities, pipelines, mines, etc. The two-dimensional echo data detected by ground penetrating radar is called B-Scan data, which is the data basis for subsequent radar signal processing, target recognition and interpretation, and the ground penetrating radar target positioning technology is also based on B-Scan data. The biggest influence o...

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Application Information

Patent Timeline
07 Nov 2017
Publication
CN107329137A
IPC
G01S13/88; G01S7/41
Inventors
乔丽红; 秦瑶