Ground penetrating radar wave velocity estimation method based on diffraction, imaging and minimum entropy technology

Abstract

The invention discloses a ground penetrating radar wave velocity estimation method based on diffraction, imaging and a minimum entropy technology. The method comprises the steps that a mean method is used to remove the direct wave component of an image; the normalized energy of the image in a two-dimensional direction is calculated, and an appropriate threshold is selected to determine a target interest region; the wave velocity range is determined according to the dielectric constant of a medium; for each wave velocity value, diffraction and the method are used to carry out synthetic aperture imaging on the image according to a target hyperbolic feature in the target interest region, and the entropy of the processed image is calculated; and finally the image corresponding to the minimum entropy is selected as the optimum imaging, and the corresponding wave velocity is the optimum wave velocity. According to the invention, the complexity of diffraction and processing is reduced by selecting the target interest region and setting a cumulative point horizontal position range; the image entropy is used to automatically determine the optimum imaging and the optimum velocity; the calculation amount is effectively reduced under the condition that the target information is completely kept; and the method has the advantages of simple calculation, high robustness and high estimation accuracy, and is suitable for engineering applications.

Description

technical field [0001] The invention belongs to the field of digital signal processing, in particular to B-scan image processing of ground-penetrating radar, in particular to a ground-penetrating radar wave velocity estimation method based on diffraction and imaging and minimum entropy technology. Background technique [0002] Ground-penetrating radar is based on the principle of electromagnetic wave propagation and scattering, and realizes the detection of underground targets by transmitting electromagnetic wave signals to the ground and receiving echoes scattered at the discontinuity of the underground medium. Compared with underground detection methods such as resistivity method, low-frequency electromagnetic induction method and seismic method, GPR has the advantages of fast detection speed, continuous detection process, high resolution, convenient and flexible operation, low detection cost, and wide detection range (can detect metal And non-metal) and other advantages, ...

AI Technical Summary

Problems solved by technology

[0009] The technical problem to be solved by the present invention is to provide a ground penetrating radar wave velocity estimation method based on diffraction and imaging and minimum entropy technology in order to overcome the defects of the existing synthetic aperture imaging wave velocity estimation method. Diffraction and synthetic aperture imaging method, by selecting the target area of ​​interest and setting the horizontal position range to reduce the calculation amount of diffraction and processing, using the image minimum entropy technology to automatically select the best imaging and the best wave velocity, to solve the problem of large amount of calculation and low accuracy of existing methods Problems with low and poor robustness

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