匀速运动目标的聚束SAR成像特征分析  

Analysis on Signatures of Moving Target on Spotlight SAR Image

作　　者：毛新华[1] 丁岚[1] 朱岱寅[1] 朱兆达[1] 

机构地区：[1]南京航空航天大学信息科学与技术学院,南京210016

出　　处：《数据采集与处理》2010年第3期295-301,共7页Journal of Data Acquisition and Processing

基　　金：中国博士后基金(20090461119)资助项目;江苏省博士后科研计划(0902014C)资助项目

摘　　要：运动目标的合成孔径雷达(SAR)成像特征是SAR/GMTI系统中进行运动目标检测和成像的基础。以往研究都是在两维可分离条带SAR成像算法条件下讨论目标运动对成像的影响,而很少考虑高分辨聚束SAR成像算法处理后运动目标的成像特征。本文推导了两种典型高分辨聚束SAR成像算法(RMA和PFA)处理后的动目标误差谱表达式,并在此基础上从目标几何定位误差、残留距离徙动和散焦等方面给出了完整的聚束SAR运动目标响应特征分析。最后通过仿真数据处理验证了分析结果。Synthetic aperture radar（SAR） signatures of moving target are the basis of ground moving target detection and imaging in SAR/GMTI system.However,previous studies mainly based on the 2-D separable stripmap SAR processing,and little work has been done to investigate the signatures of moving target after the application of a particular fine resolution spotlight SAR image formation algorithm.This paper derives the image spectrum of the moving target after two representative fine resolution SAR image formation algorithms, i.e.,the range migration algorithm（RMA） and the polar format algorithm （PFA）.Based on the derived spectrum,the SAR signatures of moving target,including the geometric displacement,residual range migration,and the defocusing effect in both the range and azimuth dimensions are analyzed. Simulation results validate the theoretical analysis.

关 键 词：合成孔径雷达 运动目标成像 距离徙动算法 极坐标格式算法 

分 类 号：TN957.51[电子电信—信号与信息处理]