中文摘要：

针对地球同步轨道合成孔径雷达超长合成孔径时间和超大场景存在的严重方位空变问题，提出了一种地球同步轨道合成孔径雷达方位空变校正方法．首先通过级数反演法得到地球同步轨道合成孔径雷达精确的二维频谱表达式，但该二维频谱中的多普勒和点目标的方位位置存在严重耦合，再通过奇异值分解将二维频谱中的多普勒与点目标的方位位置分离开来；然后通过两次插值操作将高次相位补偿掉，完成整个场景的聚焦；最后，场景点目标仿真实验验证了该方法的有效性，整个场景的点目标聚焦良好．

英文摘要：

Aimed at the severe azimuth variation caused by the ultralong synthetic aperture time and very large scene in geosynchronous synthetic aperture radar （GEOSAR）, this paper develops an azimuth variation correction method for GEOSAR. The method firstly obtains the two-dimensional spectrum by the method of series reversion （MSR）. The Doppler and azimuth positions of the point target in the twodimensional spectrum are serious coupled. The singular value decomposition （SVD） can be introduced to separate the Doppler position from the position of the point target. Subsequently, Stolt interpolation is used twice to eompensate the high-order phase terms. Thus, a focused scene is obtained. Finally, simulation for scene targets validate the proposed method. All the targets in the scene are focused well.