Geological radar B-scan data processing method

A data processing and geological radar technology, which is used in the reflection/re-radiation of radio waves, the use of re-radiation, and measurement devices, etc., can solve the problems of difficulty in setting filtering parameters, affecting the detection effect of separation effects, etc., to improve the lateral resolution, Effective separation and consistency

Active Publication Date: 2019-01-29
XI AN JIAOTONG UNIV
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Problems solved by technology

[0012] These filters are usually based on numerical simulation to set filter parameters, but the actual ground radar B-scan profile and the simulated profile will have a certain deviation, because when the set filter parameters are used for the actual B-scan profile processing, It will lead to the difficulty of setting the appropriate filtering parameters, which will affect the subsequent separation effect and detection effect

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[0040] Attached below figure 1 To accompanying drawing 6 (C) and specific embodiment, the present invention is described in further detail.

[0041] In one embodiment, the present disclosure discloses a ground radar B-scan data processing method, the method comprising the following steps:

[0042] S100. For each piece of data (A-scan) on the B-scan profile, the spectral whitening and frequency expansion method is used to process it to obtain a B-scan profile with high temporal resolution;

[0043] S200. Based on the phase shift migration imaging method, perform two-dimensional migration imaging on the high time resolution B-scan data to obtain a B-scan imaging profile;

[0044] S300. Perform iterative sparse separation on the B-scan imaging profile obtained in step S200 based on the morphological component analysis method;

[0045] S400. Analyzing the point characteristics and layered structure of the two components separated by iterative sparse separation.

[0046] Further...

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Abstract

The invention discloses a geological radar B-scan data processing method, which uses a signal processing method to process B-scan data to separate and obtain data profiles for tunnel lining anomaly and railway subgrade disease detection. Firstly, the continuous spectrum whitening frequency spectrum expansion technology is used to improve the time resolution of a signal. Then, the high-resolution data is offset and imaged by high-efficiency phase shift offset, and the lateral resolution of the profile is improved, so that the lining on the imaging profile or a reinforcing steel bar in the roadbed is focused into a point structure; finally, different morphological components such as the reinforcing steel bar and the reflective interface are separated by using a sparse separation method basedon morphological component analysis based on difference between point objects such as the reinforcing steel bar and reflective interfaces (concrete and clay layer or surrounding rock interface). Themethod helps to improve the accuracy of tunnel lining and railway subgrade detection, and provides a strong basis for tunnel and railway maintenance.

Description

technical field [0001] The invention belongs to the signal processing field of geological radar signals, in particular to a method for processing geological radar B-scan data. Background technique [0002] Tunnel construction is an important issue in highway and railway construction, and tunnel lining construction is an important link in tunnel construction at present. The later inspection of tunnel lining is an important judgment of construction quality. On the other hand, roadbed instability induced by railway subgrade disease is an important factor affecting the safe operation of railways. It is of great significance to develop effective railway subgrade detection methods. Ground-penetrating Radar (GPR) arranged on the surface of the detection target transmits high-frequency electromagnetic waves with broadband and short pulses through the transmitting antenna, and the electromagnetic waves pass through the dielectric body with electrical differences during the propagati...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/88G01S13/89
CPCG01S13/885G01S13/89
Inventor 周艳辉师振盛王晓凯陈文超
Owner XI AN JIAOTONG UNIV
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