Frequency domain imaging method of ground penetrating radar

Abstract

The invention relates to a frequency domain imaging method of a ground penetrating radar, which is a frequency domain imaging algorithm based on linear frequency modulation waves. The method comprises the steps of performing difference frequency treatment on a target echo signal received by the radar and a reference signal, obtaining an echo wave after the difference frequency; performing Fourier transform on a two-dimensional scanning direction of the echo wave; and then performing phase compensation on data by taking an imaging central point as a reference point; then, performing secondary slot interpolation operation; decoupling three-dimensional imaging data by the slot interpolation; and finally, performing three-dimensional Fourier transform on data after slot interpolation, thereby accomplishing reconstruction of images. According to the frequency domain imaging method of the ground penetrating radar, the problem in three-dimensional coherent imaging under near field condition is solved, and compared with a conventional pulsed incoherent imaging technology, and images with better resolution ratio can be obtained.

Description

technical field [0001] The invention belongs to the technical field of radar imaging, and in particular relates to a ground-penetrating radar three-dimensional coherent imaging method under near-field conditions, that is, a ground-penetrating radar frequency-domain imaging method. Background technique [0002] In recent years, radar near-field detection technology has gradually become one of the hot issues in radar application research due to demand traction. Near-field radar can be applied to different occasions, such as; through-wall detection, mine detection, road non-destructive testing, underground bunker detection and archaeological digs. At present, the radar works in the near-field mode, basically focusing on detection, and has no imaging function. [0003] Most foreign and domestic ground penetrating radar products use the signal form without carrier shock. The ground penetrating radar without carrier shock has the advantage of simple system. Generally, only shock ...

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Problems solved by technology

[0004] In the chirp system, near-field imaging radar must use coherent imaging technology to obtain high-resolution radar images. However, the current coherent imaging methods, such as RD and chirp scaling, are designed for the far-field model. In the near-field conditions, which are somewhat approximate, the algorithms used have some difficulties with near-field conditions

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