中文摘要：

改进了基于星历数据的星载合成孔径雷达多普勒计算方法.改进的方法有效地将J2摄动（地球扁率摄动）对近地点幅角和升交点赤经的影响引入到多普勒参数的计算中,得到了更准确的多普勒参数,对改进方法与传统方法的差别进行了分析.计算机仿真结果验证了改进方法的正确性.

英文摘要：

An improved method of calculating space-borne synthetic aperture radar（SAR） Doppler parameters is presented.The method relates to the satellite ephemeris.The improved method introduces J2perturbation influence on perigee amplitude and longitude ascending node to Doppler parameters calculation effectively and obtains more accurate Doppler parameters.The difference between the traditional method and the improved method is analyzed,and the accuracy of the improved method is verified through computer simulation.