海面运动舰船目标的高分辨率SAR成像  

High Resolution SAR Imaging of Moving Ship Targets at Sea

作　　者：汤立波[1] 李道京[1] 吴一戎[1] 丁赤飚[1] 

机构地区：[1]中国科学院电子学研究所微波成像技术国家重点实验室

出　　处：《电子与信息学报》2006年第4期624-627,共4页Journal of Electronics & Information Technology

基　　金：国家863计划信息获取与处理主题资助课题

摘　　要：基于高分辨率机载SAR,研究了合成孔径成像时间较长情况下海面运动舰船目标的SAR成像问题。根据船体上不同距离单元散射点多普勒历程可能不同的特点,采用粗校正和精校正相结合的方法在距离频率-方位时间域进行二阶和高阶相位补偿,完成运动舰船目标的距离徙动校正。提出了STFT和CDA处理相结合的时频分析成像方法,以获得较高的图像分辨率。实际数据的处理结果表明了该方法的有效性。The SAR imaging of moving ship targets at sea is investigated based on high resolution airborne SAR with longer synthetic aperture time. Because the scatterers at different range cells may have different Doppler characteristics, the range migration correction for moving ship is completed by coarse and fine correction procedures. The compensations of second and higher order phase terms are implemented in ＂range frequency - azimuth time＂ domain. A new time-frequency analysis imaging method is presented for higher image resolution by means of the combination of Short Time Fourier Transform （STFT） and Complex Dual Apodization （CDA）. The imaging results of real SAR data show the effectiveness of this method.

关 键 词：合成孔径雷达 舰船目标成像 运动目标成像 时频分析 

分 类 号：TN958[电子电信—信号与信息处理] TN959.72[电子电信—信息与通信工程]