一种基于数字聚束的极坐标格式算法波前弯曲补偿  

Wavefront Curvature Compensation Polar Format Algorithm Based on Digital Spotlighting Preprocessing

作　　者：毛新华[1] 朱岱寅[1] 朱兆达[1] 

机构地区：[1]南京航空航天大学电子信息工程学院,南京210016

出　　处：《宇航学报》2013年第2期246-253,共8页Journal of Astronautics

基　　金：国防基础科研计划(B2520110008);国家自然科学基金(61071165);教育部博士点基金(20123218120021);中央高校基本科研业务费专项资金(NS2012097);江苏高校优势学科建设工程资助项目

摘　　要：提出了一种基于数字聚束技术的PFA波前弯曲误差补偿新方法,该方法首先对回波数据进行两维空域滤波和降采样,将原始的宽波束大场景数据分解成若干窄的子波束子场景数据,再结合PFA的非共面运动补偿能力,能够有效解决在雷达任意航迹条件下的PFA波前弯曲误差补偿问题,显著提高PFA有效成像场景范围。仿真数据处理表明了算法的有效性。In this paper,a new wavefront curvature compensation method based on digital spotlighting preprocessing is proposed.First,digital spotlighting preprocessing,filtering and downsampling in 2-dimensional space domain,is performed on echo data.This generates multiple full-resolution phase histories of smaller image patches,each corresponding to a narrow-beam phase history data where the wavefront curvature effect can be ignored.Due to the inherent non-planar motion compensation capability,PFA is used to produce focused fine resolution image for each small patch.Finally,all focused image patches are seamed together to get a full image.Simulation experiments show that the new algorithm has improved focused scene size when applying to phase history generated by non-ideal radar flight path.

关 键 词：合成孔径雷达 极坐标格式算法 波前弯曲补偿 任意航迹 数字聚束 

分 类 号：TP958[自动化与计算机技术] V243.2[航空宇航科学与技术—飞行器设计]