地心惯性坐标系到质心轨道坐标系的坐标转换方法

Coordinate Transformation Methods from the Inertial System to the Centroid Orbit System

卫星编队飞行通常需要高精度的星间基线测量信息,而坐标转换是影响基线确定精度的一个重要环节。以分布式InSAR为例,着重研究了从地心惯性坐标系到卫星质心轨道坐标系的转换方法,详细地推导了具体的转换公式。仿真实验表明:在相同的测量条件下,直接方法的转换精度优于间接方法。并且就目前的测量条件而言,卫星的绝对速度测量是影响直接方法转换精度的主要因素。

Satellite formation flying usually needs the high-precision measurement information of inter-satellite baselines, and the coordinate transformation is one of important steps which influence the determination precision of baseline. Taking the distributed InSAR as an example, this paper lays a strong emphasis on the research of the coordinate transformation methods from the inertial coordinate system to the centroid orbit coordinate system, and deduces the idiographic formulas of them in detail. The results of simulation show that the transformation precision of the direct method is better than the indirect method in the same measure conditions, and the main factor of affecting the transformation precision of the direct method is the absolute velocity measurement in terms of the current conditions of measurement.