一种适用于椭圆轨道的新型偏航导引规律

A Novel Yaw Steering Method Suitable for Elliptical Orbit

多普勒特性是星载合成孔径雷达(SAR)数据处理中关键参数之一,对方位向性能以及成像精度都有着非常重要的影响。基于轨道动力学理论,该文简要论述了传统偏航导引方法和全零多普勒方法,并分别分析了它们应用于椭圆轨道时的不足之处,提出了一种新的适用于椭圆轨道的偏航导引方法。利用TerraSAR-X卫星轨道参数,分别使用这三种方法进行了数值仿真,仿真结果表明,使用新的偏航导引方法后,多普勒中心频率被减小到不超过5Hz,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超过5倍,表明了该方法的优势及有效性。

Doppler property is one of the key parameters in the spaceborne Synthetic Aperture Radar（SAR） data processing,and it has very important influences on the azimuth performance and the imaging accuracy.In this paper,the traditional yaw steering method and the Total Zero Doppler Steering method are presented briefly,then the deficiencies of the two methods used in elliptical orbit are analyzed,and a novel yaw steering method suitable for elliptical orbit is presented.Orbit parameters of TerraSAR-X are used to calculate the doppler centroid frequency,the results indicate that the new method reduce the doppler centroid frequency100 times smaller than traditional yaw steering method,and 5 times smaller than the Total Zero Doppler Steering method,and the method is proved to be efficient.