A RESEARCH OF SAR MOVING TARGETS IMAGING BY JOINT TIME-FREQUENCY ANALYSIS
利用时-频分析进行合成孔径雷达运动目标成象的研究

Some problems 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. Moreover, Hough Trans-form(HT) is employed in restraining the disturbing cross terms, produced 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 ratio is very low.