利用时-频分析进行合成孔径雷达运动目标成象的研究
A RESEARCH OF SAR MOVING TARGETS IMAGING BY JOINT TIME-FREQUENCY ANALYSIS
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摘要: 本文研究了利用时-频分析方法进行合成孔径雷达运动目标成象的若干问题。分析了三种时-频变换方法短时傅里叶变换,小波变换和Wigner-Ville分布(WVD),提出只有WVD才能满足要求。针对WVD的双线性特性所造成的交叉项干扰问题,提出用Hough变换来抑制交叉项。实验证明,即使在信噪比很低时,WVD和Hough变换结合的方法仍能提供很好的检测性能。Abstract: Some probles about SAR moving targets imaging by joint time-frequency analysis are discussed in this paper.Three kinds of time-frequency transforms--Short Time Fourior Transform(STFT),Wavelet Transform(WT) and Wigner-Ville Distribution (WVD) are compared.It is presented that only WVD could meet the requirement.Moveover,Hough Transform(HT) is employed in restraining the distribing corss terms,rpoduced by the WVD due to its bilinear property.Experiments test that the combined WVD and HT could provide satisfactory detection performance even if the signal-to-noise rato is very low.
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Freeman A, Currie A. A synthetic aperture radar and moving targets. GEC Journal of Research, 1987, 5(2): 106-115.[2]Barbarossa S, Zanalda A. A Conbined Wigner-Ville and Hough transform for crossterms suppression and optimal detection and parameter estimation, ICASSP92, Mar., 1992, San Francisco: 173-176.[3]刘贵忠,刘志梅.一种新的二次时频分布和几种主要二次时频分布的比较研究.电子科学学刊,1996, 18(5): 455-461.[4]王韬.SAR运动目标检测、成象方法的研究:[硕士学位论文].北京:中国科学院电子学研究所,1995. -
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