机载SAR数据的成像研究

对某型实测机载合成孔径雷达 (SAR)数据的特性进行了分析 ,针对实测数据方位孔径的不完全性 ,且具有较大几何形变和距离徙动的特点 ,提出了一种基于CS(ChirpScaling)操作与Dechirp技术相融合的成像处理算法 ,它不须单独进行几何形变校正 ,而是利用CS操作既完成几何形变校正又完成距离徙动校正 ,针对方位孔径的不完全性 ,方位聚焦采用谱分析的Dechirp技术 ,该方法适用于对部分孔径的数据进行成像处理 ,并与常用的基于谱分析的Dechirp快视成像处理算法进行了比较。

Research for Imaging of Airborne SAR Data

A kind of airborne SAR data is analyzed. For the specific property of airborne SAR data, a new imaging algorithm combined with the Dechirping technique is proposed, which, instead of performing geometric correction individually, correct range cell migration and geometric distortion simultaneously via Chirp Scaling operation. The focusing in azimuth is done by use of the Dechirping technique. This method is suitable for imaging using partial aperture data. The comparison of the proposed algorithm with the quick look imaging algorithm based on the Dechirping technique shows that the performance of former is much better than that of the latter.