前視探地雷達(dá)合成孔徑成像方法的研究
Research on Forward-Looking Ground Penetrating Radar Synthetic Aperture Imaging
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摘要: 根據(jù)前視探地雷達(dá)波斜入射,并且經(jīng)過空氣和地下兩層介質(zhì)的特點(diǎn),提出了基于等效波場(chǎng)和全息成像的頻率波數(shù)域前視探地雷達(dá)合成孔徑成像方法。該方法對(duì)地面以上的記錄剖面用基于全息成像的頻率波數(shù)域成像方法成像,對(duì)地面以下記錄剖面的成像,則用地面測(cè)線處的等效波場(chǎng)。所提方法把兩層介質(zhì)中的成像問題簡(jiǎn)化成單層介質(zhì)中的合成孔徑成像問題。對(duì)實(shí)驗(yàn)數(shù)據(jù)的處理結(jié)果表明,所提方法能有效地提高信雜比,提高目標(biāo)的方位分辨率。
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關(guān)鍵詞:
- 前視探地雷達(dá); 合成孔徑成像; 等效接收波場(chǎng)
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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