前视探地雷达合成孔径成像方法的研究
Research on Forward-Looking Ground Penetrating Radar Synthetic Aperture Imaging
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摘要: 根据前视探地雷达波斜入射，并且经过空气和地下两层介质的特点，提出了基于等效波场和全息成像的频率波数域前视探地雷达合成孔径成像方法。该方法对地面以上的记录剖面用基于全息成像的频率波数域成像方法成像，对地面以下记录剖面的成像，则用地面测线处的等效波场。所提方法把两层介质中的成像问题简化成单层介质中的合成孔径成像问题。对实验数据的处理结果表明，所提方法能有效地提高信杂比，提高目标的方位分辨率。Abstract: According to the characteristic that Forward Looking Ground Penetrating Radar (FLGPR) wave incidents aslant and propagates through two layer medium of the air and the ground, the Frequency-Wavenumber (F-W) Synthetic Aperture Imaging (SAI) method of FLGPR is proposed based on equivalent wavefield and hologram imaging. The proposed method images the recorded section above the ground by F-W SAI based on the hologram imaging method. Then, the recorded section underground is SAI with the equivalent wave field in the swath on the ground surface. The proposed method reduces the SAI in two layers to SAI in every layer respectively. The experimental results show that the proposed method is effective.
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