两种观测技术综合精密定轨的探讨

AN INVESTIGATION OF THE PRECISE ORBIT DETERMINA- TION BY COMBINATION OF TWO KINDS OF MEASUREMENTS

利用T/P卫星的SLR和DORIS实测资料 ,对两种观测技术综合精密定轨中的加权及其对定轨影响的问题作了初步的探讨 .根据所提出的一种经验性的加权方法进行了综合定轨计算 ,结果表明 :对于两种不同技术的观测 ,相对权选取的恰当与否将影响综合定轨的精度 ;综合定轨的最优加权不仅依赖于观测资料的精度 ,还与观测资料的多少和几何分布有关 ;通过选用最优加权 ,可使得综合定轨的精度优于仅用其中一种技术的定轨精度 ,综合定轨能有效地提高定轨精度 .

In this paper, the problem of weighting in the precise orbit determination by combination of tracking data given by two techniques is investigated. An empirically weighting method is given. With this method, the precise orbit of T/P is determined by combining SLR and DORIS measurements. The results show that the weight may significantly affect the accuracy of the combined determination of satellite orbit, and the weighting method is concerned not only in the precision of tracking data, but also in their number and geometry of distribution. On the whole, the combined solution strategy can significantly improve the accuracy of the precise orbit determination by selecting the proper weight.