一种改进的双基地SAR数值计算传递函数成像算法

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雏传递函数,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.

Improved bistatic SAR imaging algorithm based on numerically computed transfer functions

Seeing that the strip mode of bistatic 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.