Windowing weighted backward projection imaging method for ground penetrating radar
A backward projection, ground penetrating radar technology, applied in the direction of reflection/re-radiation of radio waves, utilization of re-radiation, measurement devices, etc.
Active Publication Date: 2014-09-17
CENT SOUTH UNIV
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Problems solved by technology
In GPR (ground radar) applications, there are usually multiple targets in the scanning area, and the diffraction curves of each target usually overlap partially.
When performing imaging processing, if the scattering echo data on the entire time-delay curve is used for weighted imaging for each imaging unit, the scattering data of adjacent targets will cross and overlap, resulting in a decline in the quality of multi-target imaging
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Embodiment 1
[0043] This example is aimed at the synthetic aperture detection imaging of the target in the uniform layered background medium, but this technology is not limited to the uniform layered background medium and synthetic aperture scanning, and it is also applicable to the real aperture scanning and multi-shot multi-receiving scanning methods under complex background media .
[0044] Firstly, the ground penetrating radar is used to scan the detection area one-dimensionally, such as figure 1 shown. The area z>0 is air, the area z figure 2 shown. figure 2 The original scattering data in the data after the preprocessing of the direct wave is as follows: image 3 shown. In the following, the traditional weighted back projection algorithm and the windowed weighted back projection algorithm are used for imaging calculation. Figure 4 A schematic diagram of extracting scattered echoes at time-delay curves in the traditional weighted back-projection algorithm is given. In the figur...
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The invention discloses a windowing weighted backward projection imaging method for a ground penetrating radar. The method includes the steps of computing a time delay curve of each imaging unit in an imaging region according to a scanning scene, then extracting scattering data of a data section formed by preprocessing the original record section on each time curve, and generating one-dimensional scattering data vectors; calculating cut-off length Wa according to the beam width of an antenna of the ground penetrating radar and the depths of the imaging units, and then cutting off a data segment with the length of Wa in each one-dimensional scattering data vector according to the transverse positions of the corresponding imaging unit; designing weight coefficients according to the cut-off data and performing imaging operation; and traversing all the imaging units so that the imaging operation is finished. The windowing weighted backward projection imaging method can increase imaging quality.
Description
technical field [0001] The invention belongs to the technical field of ground-penetrating radar imaging, and relates to a ground-penetrating radar window-weighted back-projection imaging method. Background technique [0002] Ground penetrating radar is an effective non-destructive detection technology. It emits electromagnetic waves to the detection area and receives scattered echoes through airspace scanning, which can realize imaging processing inside unknown areas and obtain hidden target parameters in unknown areas, that is, target distribution information and scattering intensity information, which can be effectively used in municipal engineering and archaeology. , mine detection, anti-terrorism and other occasions. The airspace scanning of ground penetrating radar includes one-dimensional scanning along the line and two-dimensional scanning on the surface. During one-dimensional scanning, the transmitting antenna and receiving antenna move along the line at a certain...
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IPC IPC(8): G01S13/89
Inventor 雷文太
Owner CENT SOUTH UNIV