基于方位向去调频处理的滑动聚束SAR两步成像处理算法  

A Two-step Imaging Algorithm for Sliding Spotlight SAR Based on Azimuth De-chirp Processing

作　　者：周鹏[1] 林玲娟 戴永寿[1] 

机构地区：[1]中国石油大学(华东)信息与控制工程学院,青岛266580

出　　处：《遥测遥控》2014年第1期50-55,59,共7页Journal of Telemetry,Tracking and Command

基　　金：国家自然科学基金(40974072);中央高校基本科研业务费专项资金(27R0905024A)

摘　　要：消除方位向的频谱混叠现象是滑动聚束SAR成像处理的重要环节。针对这一问题,将方位向去调频(Dechirp)处理应用于滑动聚束模式成像。滑动聚束回波数据经方位向去调频处理后,降低了方位向的带宽,同时并未造成方位向采样点数的增加,并且完成了方位向粗聚焦。相比传统的基于方位向滤波处理的两步算法,其占用内存空间更少,运算速度更快。文中还通过点目标的仿真实验验证了所提算法的有效性。It is an important step for sliding spotlight SARs＂ developers to eliminate the spectrum aliasing in the azimuth direction. The azimuth de-chirp processing is applied in the imaging processing for sliding spotlight SAR to solve the aliasing problem. The data processed after the azimuth de-chirp processing own low azimuth bandwidth without the increase of azimuth samples and the coarse focusing in the azimuth direction is achieved. The two-step imaging algorithm based on azimuth de-chirp processing has faster speed and lower memory usage compared with the traditional two-step algorithm based on azimuth filtering. The effectiveness of the proposed algorithm is validated through the point-target simulation.

关 键 词：合成孔径雷达 滑动聚束模式 成像算法 方位向去调频 

分 类 号：TN958[电子电信—信号与信息处理]