基于方位FNCS的斜视TOPS SAR成像方法  

Squint TOPS SAR imaging method based on azimuth FNCS

作　　者：杨军[1] 吴玉峰[1] 孙光才[1] 邢孟道[1] 周峰[1] 

机构地区：[1]西安电子科技大学雷达信号处理国家重点实验室,陕西西安710071

出　　处：《系统工程与电子技术》2012年第11期2237-2243,共7页Systems Engineering and Electronics

基　　金：国家自然科学基金(60890072);国家重点基础研究发展计划(973计划)(2010CB731903)资助课题

摘　　要：针对斜视循序扫描地形观测(terrain observation by progressive scans,TOPS)合成孔径雷达(synthetic aperture radar,SAR)模式,提出了一种新的全孔径成像处理方法。首先对距离走动校正后的数据进行方位预处理得到无模糊的二维频谱,在此基础上采用修正的线频调变标算法完成距离脉压及距离徙动校正;然后在距离多普勒域进行频域非线性变标(frequency nonlinear chirp scaling,FNCS)以校正调频率的空变性,并结合谱分析(spectral analysis,SPECAN)技术将信号聚焦在方位频率域,最后校正几何形变。仿真和实测数据处理结果验证了算法的有效性。For squint terrain observation by progressive scans （TOPS） synthetic aperture radar （SAR） mode, this paper proposes a new full-aperture imaging algorithm. Firstly, the two-dimensional （2-D） spectrum without aliasing is obtained by the azimuth pre-processing after range walk correction. Then the modified chirp scaling algorithm is used to complete range compression and range cell migration correction （RCMC）. After that, by using a frequency nonlinear chirp scaling （FNCS） method in the range Doppler domain, the variation of the FM rates is corrected, and the signal is focused in the Doppler domain by SPECAN technique. Finally, geometric distortion correction is carried out. Both simulation and real data processing results demonstrate the effectiveness of the proposed method.

关 键 词：斜视循序扫描地形观测合成孔径雷达 全孔径处理 频域非线性变标 修正的线频调变标算法 谱分析 

分 类 号：TN957.52[电子电信—信号与信息处理]