一种改进的双基地SAR数值计算传递函数成像算法  

Improved bistatic SAR imaging algorithm based on numerically computed transfer functions

作　　者：吕艳[1] 孙进平[1] 白霞[1] 毛士艺[1] 

机构地区：[1]北京航空航天大学电子信息工程学院203教研室,北京100083

出　　处：《系统工程与电子技术》2008年第11期2119-2122,共4页Systems Engineering and Electronics

基　　金：武器装备预研基金资助课题(9140A07020106HK0130)

摘　　要：针对收发平台等速度平行飞行双基地SAR条带工作模式,提出了一种改进的双基地SAR数值计算传递函数成像算法。算法通过数值计算得到双基地二维传递函数,通过场景坐标系向方位-斜距平面的映射校正了原算法中存在的沿距离变化的方位位置畸变,进而采用常规单基地SAR成像处理流程实现对双基地SAR回波数据的成像处理,最后通过点目标仿真验证了算法的有效性。由于距离徙动校正不需要插值计算,因此计算效率较高,适合进行高速并行成像处理。Seeing that the strip mode of histatic SAR which the platforms of transmitters and receivers are flying parallel at a constant speed, an improved bistatic SAR imaging algorithm is proposed. The 2-D transfer function of the bistatic SAR is obtained. Azimuth position distortion along range existing in the original alogrithm is corrected by mapping from scene coordinate to azimuth-slant distance coordinate. Bistatic SAR date can still be processed by a mono-static SAR processor. The efficaciousness of the proposed algorithm is verified through point target simulations. The proposed algorithm can perform range cell migration correction accurately without any interpolation, so it is suitable for fast parallel processing.

关 键 词：合成孔径雷达 双基地 数值计算传递函数 成像算法 

分 类 号：TN95[电子电信—信号与信息处理]