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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 flight usually requires high-precision inter-satellite baseline measurement information, and coordinate conversion is an important part of the baseline to determine the accuracy. Taking Distributed InSAR as an example, this paper focuses on the conversion from geocentric inertial coordinate system to satellite centroid orbit coordinate system, and deduces the concrete conversion formula in detail. Simulation results show that the conversion accuracy of the direct method is better than the indirect method under the same measurement conditions. And for the current measurement conditions, the satellite’s absolute velocity measurement is a major factor affecting the accuracy of direct method conversion.