说明：  合成孔径雷达( SAR) 是一种高分辨率成像雷达，可以在能见度极低的气象条件下得到类似光学照相的高分辨雷达图像。 BP算法基于时域处理回波信号，利用脉冲压缩技术实现距离向匹配滤波，方位向分辨率通过沿回波曲线进行相干叠加实现。
(Synthetic aperture radar (SAR) is a kind of high-resolution imaging radar, which can obtain high-resolution radar images similar to optical photography under extremely low visibility weather conditions. BP algorithm is based on time-domain processing of echo signal, using pulse compression technology to achieve range matched filtering, azimuth resolution is achieved by coherent superposition along the echo curve.)