Method for removing ground waves from shallow ground radar signal

Abstract

The invention discloses a method for removing ground waves from a shallow ground radar signal. The method comprises the following steps: sampling continuous radar waveforms according to an isochronouswindow, wherein any radar signal Ascan in any isochronous window contains m acquisition points; enabling a single-channel radar to generate n radar signals Ascan during operation, and marking the n radar signals Ascan as channel radar waves bscan; carrying out continuous wavelet transform on any radar signal Ascan of the channel radar wave bscan by adopting a Mexico hat wavelet, and searching a position k where any radar signal Ascan in the channel radar wave bscan is closest to the Mexico hat waveform; sequentially arranging the positions k of any radar signal Ascan to obtain a position setsequence K; and carrying out smoothing processing on the position set sequence K, and removing ground waves. By means of the scheme, the method has the advantages of being simple in logic, reliable inremoval, small in calculation workload and the like.

Description

technical field [0001] The invention relates to the technical field of ground-to-ground radar signal processing, in particular to a method for removing ground waves from shallow-layer ground-to-ground radar signals. Background technique [0002] Ideally, shallow ground penetrating radar equipment works close to the ground, and the collected radar wave data starts from the ground. However, in actual situations, in order to prevent wear and tear on the radar equipment, the radar equipment will involve a certain distance from the ground (such as figure 1 As shown), in the working state, due to the fact that the receiving devices of the radar channels may not be installed on the same level, the ground is uneven during work, and the equipment itself is bumpy, in a slice diagram, each ascan shows a height above the ground. different distances, such as figure 2 as shown, figure 2 It is a local slice of the radar data. It can be seen from the figure that each radar ascan data h...

AI Technical Summary

Problems solved by technology

[0006] Third, in the Chinese invention patent with the patent application number "202010997862.1" and the title "A Method for Removing Ground Waves from Shallow Ground-to-Ground Radar Signals", it uses the extreme value method to find The position of the extreme point of the ascan waveform is recorded as P, and the position is corrected within a certain range, and the new position is searched in [p-a,p+a]. Assuming that the new position q is greater than the amplitude of p, record the new The position is the final ground wave position found. This method is generally effective because the initial search range L and the subsequent correction range a are based on the preset empirical values ​​of the equipment’s working state. When the equipment Working in an unconventional working environment, such as a particularly bumpy road, the above range may not contain the optimal solution, and it is easy to fall into a local optimal solution, such as Figure 5 shown

However, with some radar data in harsh working environments, the current extreme value method cannot remove the ground direct wave very well

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