一种改进的机载前斜视SAR二次距离压缩成像算法  

An Improved Secondary Range Compression Imaging Algorithm for Air-borne Squint SAR

作　　者：陈琦[1] 杨汝良[1] 

机构地区：[1]中国科学院电子学研究所

出　　处：《电子与信息学报》2007年第6期1445-1449,共5页Journal of Electronics & Information Technology

摘　　要：该文基于斜视距离模型,直接推导了适用于大斜视合成孔径雷达(SAR)成像的二次距离压缩(SRC)算法,在此基础上提出了一种改进的机载前斜视SAR的SRC成像算法。通过补偿距离频率的三次相位项,有效改善了大斜视SAR成像距离压缩旁瓣非对称畸变的问题,通过补偿波束前视引入的平动相位项,解决了图像位置在方位向发生偏移的问题。给出了实现步骤和算法流程,对比了不同斜视角情况下算法改进前后的成像效果。仿真表明,该算法能有效改善大斜视SAR的成像质量,适合于大斜视机载SAR成像。In this paper, a refined Secondary Range Compression （SRC） imaging algorithm for large squint air-borne Synthetic Aperture Radar （SAR） is presented. Based on the squint range mode, refined SRC algorithm for squint mode SAR is deduced directly. By compensating the cubic phase term of range frequency, the problem of range compressing unsymmetrical sidelobe is improved effectively, By compensating the parallel phase term introduced by forward looking beam, the shift of image location in azimuth is solved. Implemented steps and algorithm flow are given, imaging effects are compared in different squint angle as well. The simulation demonstrates that imaging quality is improved obviously and this algorithm is suitable for large squint air-borne SAR imaging.

关 键 词：合成孔径雷达(SAR) 前斜视 二次距离压缩(SRC) 

分 类 号：TN959.73[电子电信—信号与信息处理]