逆合成孔径雷达成像中散射点走动的校正
COMPENSATION OF SCATTERERS MIGRATION IN ISAR IMAGING
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摘要: 距离-多普勒算法是ISAR最常用的成像方法,它将目标上的散射点按其距离和多普勒的二维分布形成目标图像。为了得到较高的多普勒分辨率,成像的观测期间目标必须有一定的转角,即存在散射点走动,在分辨率要求较高的场合则会发生越分辨单元走动(MTRC),从而使成像点扩展函数扩散,分辨率下降。本文研究了散射点走动问题,并提出了一种简单而有效的校正方法。计算机仿真和转台数据的校正结果表明,成像质量得到明显改善。Abstract: Range-Doppler method is the most common method in ISAR imaging. To obtain radar image of a target, certain angle of the target with respect to Radar Light Of Sight (RLOS) during the coherent integration interval is required. In some case, there will exist scatterers migration. Actually, scatterers Migration Through Resolution Cell (MTRC) occurs inevitably in higher resolution radar image, which will result in the point-spread function broadening and image resolution decreasing. The scatterers' migration is discussed in the paper and a simple and efficient method is proposed to compensate MTRC. Compensation results of the simulated data and the real data collected in a microwave anechoic chamber show that the resolution of the final radar image is improved.
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Dale A A, Adam K, Jack L W, Harrison MJ, Enrico C P. Developments in radar imaging. IEEE Trans. on AES, 1984, AES-20(4): 363-400.[2]Kong K K, Edwards J A. Polar format blurring in ISAR imaging. Electron. Lett. 1995, 31(17): 1502-1503.[3]Walter G C,RON S G, et al. Spotlight SAR Signal Processing Algorithms, Boston-London: Artech House, 1995, Chapter 3,4.[4]Wehner D R. High Resolution Radar, Second Edition, Boston-London: Artech House, 1995, Chapter 7.[5]Walker J L. Range-Doppler imaging of rotating objects. IEEE Trans. on AES, 1980, AES-16(1):[6]-52.[7]Brown W M,Fredricks R J. Range-Doppler imaging with motion through resolution cells, IEEE[8]Trans. on AES. 1969, AES-5(1): 98-102.[9]卢光跃,保铮.ISAR成像中MTRC校正算法性能分析西安电子科技大学学报,已录用(待刊). -
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