中文摘要：

分析了地球自转和椭圆轨道对地球同步轨道星载合成孔径雷达（GEO SAR）多普勒中心频率的影响.在平台坐标系下推导出了二维偏航控制所需的偏航和俯仰角度的解析表达式;并结合GEO SAR偏航角度大、下视角变化范围小、平台转动难和稳定难等特点,提出了由小角度的二维相位扫描方法来完成GEO SAR多普勒中心频率的高精度补偿方法,实现了GEO SAR的偏航控制.仿真结果验证了该方法的有效性.

英文摘要：

In this paper,the effect of earth rotation and elliptical orbit on Doppler center frequency in GEO SAR is analyzed,and the close forms of two dimensional yaw and pitch angles for yaw control are analytically obtained in satellite platform coordinate system. Considering the feature of GEO SAR system,the phase scan method is proposed to carry out the high accurate compensation of Doppler center frequency,which can escape from the difficulties of wide angle rotation and reliable stabilization of GEO SAR system. Simulation results show that the above analysis and proposed method is efficient.