椭圆轨道全零多普勒导引律研究

星载合成孔径雷达(SAR)数据处理中，多普勒特性对于方位向性能以及成像精度都有直接的影响。基于轨道动力学理论，在椭圆轨道情况下，该文导出了同时考虑偏航控制和俯仰控制的多普勒中心频率解析表达式，分别分析了偏航控制和俯仰控制对多普勒中心的影响，提出一种基于椭圆轨道的全零多普勒方法，并用TerraSAR-X轨道参数进行了数值仿真，仿真结果表明，使用该方法后，多普勒中心频率被减小到不超过5 Hz，比传统的偏航导引方法缩小了约一百倍，比基于瞬时圆轨道的全零多普勒方法缩小了5倍，表明了该方法的有效性。

Research on Elliptic Orbit Total Zero Doppler Steering

For spaceborne Synthetic Aperture Radar(SAR) processing, Doppler property influences the azimuth performance and the imaging accuracy directly. In this paper, the Doppler centroid frequency expression based on elliptical orbit is derived analytically. The influences of the yaw steering and the pitch steering are analyzed respectively. Then, a new method called elliptic orbit total Zero Doppler steering is proposed, and a simulation for TerraSAR-X parameters shows its advantages. The simulation results indicate that this method reduces the Doppler centroid 100 times smaller than currently applied yaw steering methods, and 5 times smaller than the circular orbit total Zero Doppler steering, which illuminates the applicability of the method.