A wall suppression method for through-wall detection based on phase-locked tracking loop

Abstract

The invention discloses a wall-penetrating detection wall suppression method based on a phase-locked tracking loop. The steps include: 1) multiplying the original echo signal received by the receiving antenna with the local carrier sin and cos generated by the PLL module, After the carrier is stripped, it is divided into two channels of signals; 2) Send the two channels of signals into the first DLL module together, after calculating the delay phase τ of the M sequence, output the M sequence, multiply it with the carrier cos output by the PLL module, and obtain the direct wave signal; 3) subtracting the received original signal from the direct wave signal to obtain the direct signal; 4) passing through multiple DLL modules in turn, repeating the processing methods from step 1) to step 3), and finally obtaining the target echo information, Serve. The method of the invention is applied to the wall-penetrating radar, and the signal-to-noise ratio is suitable, and the target detection is accurate.

Description

technical field [0001] The invention belongs to the technical field of radar through-wall detection, and relates to a wall suppression method for through-wall detection based on a phase-locked tracking loop. Background technique [0002] The through-wall radar transmits electromagnetic waves of specific frequencies to penetrate and detect non-transparent media such as walls, wood boards, and trees. Electromagnetic waves of 0.5GHz to 3GHz have a good penetrating ability to walls and will not harm the human body. Through-the-wall radar can pass through concrete walls, slate walls, and wooden walls, etc., and has a wide range of applications in post-disaster rescue, hostage rescue, and urban combat. In the imaging of through-wall radar, due to the existence of the wall, when the electromagnetic wave penetrates the wall, the electromagnetic wave will be reflected, refracted and changed in speed, resulting in time delay, attenuation and distortion of the signal; the image of the ...

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a wall-through-wall detection wall suppression method based on a phase-locked tracking loop, which solves the problem of wall parameter estimation errors in the prior art that lead to detection target position errors, and the target and wall confusion in the echo signal. Overlapping makes it impossible to separate target information

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