星载ScanSAR模式ECS成像算法研究  

Study on ECS Imaging Algorithm for Space-Borne ScanSAR Data Processing

作　　者：赵志伟[1] 杨汝良[1] 祁海明[1] 刘小刚[1] 

机构地区：[1]中国科学院电子学研究所

出　　处：《测试技术学报》2007年第5期418-423,共6页Journal of Test and Measurement Technology

摘　　要：针对ScanSAR的扩展CS(ECS)成像算法兼有CS算法的精确处理和SPECAN算法的高效性.从ScanSAR回波的一般表达式出发,推导了扩展CS算法的信号流程.根据推导结果,利用另一种距离向处理参考函数和方位变标函数完成了变标处理.利用点目标仿真回波成像试验,分析了本文的算法与原始扩展CS算法的区别,验证了本算法的相位保持特性.利用ASAR Wide Swath原始数据,结合ScanSAR数据的多普勒中心频率估计,验证了算法适合于实际数据成像.Extended Chirp-Scaling （ECS） imaging algorithm for ScanSAR has advantages of both accurateness of chirp-scaling algorithm and high efficiency of SPECAN algorithm. In this paper, based on the general ScanSAR echo expression, the signal flow of ECS algorithm was derived, and new expressions of reference function for range processing and azimuth scaling were proposed. The new functions can correct residual phase in range processing and the result is easily for mosaic in azimuth. The derived result shows that it is also phase preserving. The influence of range scaling and phase preservation is analyzed with simulated point target echo data. The algorithm combined with a ScanSAR Doppler Centroid estimation method is validated with ASAR Wide Swath raw data.

关 键 词：合成孔径雷达 SCANSAR ECS算法 距离变标 相位保持 

分 类 号：TN957.52[电子电信—信号与信息处理]