一种基于脉冲压缩的机载条带SAR重叠子孔径实时成像算法  

Research on Overlapped Subaperture Real-time Imaing Algorithm for Pulse Compression Airborne Strip SAR System

作　　者：詹学丽[1] 王岩飞[1] 王超[1] 刘碧丹[1] 

机构地区：[1]中国科学院电子学研究所,北京100190

出　　处：《雷达学报（中英文）》2015年第2期199-208,共10页Journal of Radars

基　　金：国家自然科学基金(61101201)资助课题

摘　　要：该文提出了一种基于距离向脉冲压缩体制的机载条带SAR重叠子孔径(OSA)实时成像算法,可直接应用于未采用去斜接收技术的条带机载SAR实时成像处理系统。该算法在距离向采用脉冲压缩技术、方位向采用OSA信号处理方法,能够在成像过程中完成距离徙动校正并消除空变相位误差,得到条带模式下的高分辨率图像。首先分析了条带模式SAR几何关系,然后在脉冲压缩体制下建立了回波模型并对成像流程进行了详细的数学推导,最后对运算量、存储量与成像范围进行了计算分析,对点目标数据进行了仿真,利用实时处理平台对原始数据进行了成像,验证了算法的高时效性。A high-resolution real-time subaperture imaing formation for range direction pulse compression airborne strip Synthetic Aperture Radar （SAR） system is presented. It can be used in no dechirp strip SAR system. By pulse compression in range direction and Overlapped Subaperture Algorithm （OSA） in azimuth direction this algorithm can compensate the range-azimuth cross error and the space variant phase error. In this study, first strip SAR geometry is analyzed and the strip SAR model is derived, and then the processing flow of OSA for range pulse compression strip SAR system is described in detail. Computation load, data storage and limitations of patch are analyzed then. The point-target simulations and live data processing results show the proposed approach is feasible and effective.

关 键 词：合成孔径雷达(SAR) 实时成像 脉冲压缩 重叠子孔径算法(OSA) 

分 类 号：TN958[电子电信—信号与信息处理]