^pKey;
Laboratory;
of;
Microwave;
Imaging;
Technology,;
Institute;
of;
Electronics,;
Chinese;
Academy;
of;
Sciences,;
Beijing;
100190,;
P.;
R.;
China;
^pUniversity;
of;
Chinese;
Academy;
of;
Sciences,;
Beijing;
100049,;
P.;
R.;
China;
波数域算法; 循环使用; 回波信号模型; 合成孔径长度; 改良; 特区; K型; 合成孔径雷达;