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Ground penetrating radar thin layer target identification and positioning method

A positioning method and target identification technology, which are applied in the field of thin-layer positioning and identification of ground penetrating radar based on synchronous extrusion short-time Fourier transform, to achieve the effects of short computing time, ensuring accuracy, and improving accuracy

Pending Publication Date: 2019-03-26
HENAN UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

[0006] In order to solve the problem that there are many disadvantages in the traditional underground target positioning method, the present invention provides a ground-penetrating radar thin-layer target recognition and positioning method based on synchronous squeeze short-time Fourier transform

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  • Ground penetrating radar thin layer target identification and positioning method
  • Ground penetrating radar thin layer target identification and positioning method

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Embodiment Construction

[0055] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0056] Synchrosqueezing Short Fourier Transform (SSWT). The transformation here is mainly the short-time Fourier transform, and the recombination method is based on the idea of ​​the time-spectrum rearrangement method. If it is compared with the spectrum rearrangement method based on wavelet transform, their main difference lies in After the time-Fourier transform, the reprocessing of the time-frequency spectrum is different. The former only rearranges the frequency domain, while the latter rearranges the time-frequency domain simultaneously. This method guarantees the mathematical reversibility of the wavelet transform while improving the time-frequency accuracy. Therefore, the synchrosqueezed short-time Fourier transform not only has the high time-frequency resolution of the time-spectrum rearrangement method, but also is reversible. It has a good applicat...

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Abstract

The invention discloses a ground penetrating radar thin layer target identification and positioning method. The method comprises the following steps of (1) extracting each column successively from a target area of interest as an A-scan target; and carrying out synchrosqueezing short Fourier transform on each A-scan radar target data; (2) acquiring the time frequency energy information map of a signal; (3) according to energy distribution, finding a thin layer area; and (4) according to the time frequency energy information map, measuring the thickness of the thin layer to realize the positioning and the identification of a thin layer target. By using the method, data training does not need to be performed; thin layer target information can be completely reserved so as to increase the precision of target positioning, and for thin layer data with the layer thickness of lambda / 8, the thickness of the thin layer can be identified; thin layer identification precision can be increased, and astrong clutter and a target echo can be effectively distinguished; and an algorithm is simple, the operation time of the algorithm is short, and the accuracy of rapid thin layer target positioning isensured.

Description

technical field [0001] The invention relates to the field of ground-penetrating radar detection, in particular to a ground-penetrating radar thin-layer positioning and identification method based on synchronously squeezed short-time Fourier transform. 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. [0003] When the electromagnetic wave propagates in the layered medium, if the wave impedance of the medium on both sides of the interface is discontinuous, the electromagnetic wave will be reflected on the interface. In this paper, a layered medium model containing thin layers is first est...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/88
CPCG01S13/885
Inventor 乔丽红秦瑶王其富任笑真朱春华贾曼曼
Owner HENAN UNIVERSITY OF TECHNOLOGY
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