合成孔径雷达子孔径数据改进ECS成像算法  

An Improved ECS Algorithm for SAR with Sub-Aperture Data

作　　者：杨立波[1] 陆和平[1] 高磊[1] 

机构地区：[1]北京航天自动控制研究所,北京100854

出　　处：《航天控制》2012年第2期22-27,共6页Aerospace Control

摘　　要：ECS算法中的方位CS操作会产生大量补零问题,影响成像实时性。本文提出一种改进ECS算法,在补偿方位向高次相位后,不进行调频斜率调整,采用变标傅立叶变换校正方位向输出间隔随距离变化的扇形畸变,克服了ECS算法需要大量补零的不足,仿真验证了算法的有效性。The zeros expansion problem and deteriorated real time imaging are introduced during the azimuth chirp scaling operations in the extend chirp scaling （ECS） algorithm. An improved extended chirp scaling algorithm is proposed. The scaling Fourier transform is applied to correct the fan-shaped distortion after the cubic and higher term phases are compensated, which adjusts the frequency modulation rates so that the zeros expansion problem of the ECS algorithm is solved. The simulations demonstrate the validity of the algorithms.

关 键 词：弹载SAR SAR成像 改进ECS算法 

分 类 号：TN957[电子电信—信号与信息处理]