一种新的卫星导航星间链路测距体制及其定轨性能分析

A novel navigation inter-satellite links ranging hierarchy and its orbit determination performance

现有的GPS星间链路轮询时分测距体制未针对定轨性能进行优化。对轮询时分测距体制进行改进,提出了一种新的分组时分测距体制,通过对整星座所有卫星进行分组测距来提高星间测距链路数量,从而提高星地星间联合定轨精度。以整星座平均定轨精度最优为目标,提出了两步优化算法,得到星间总测距链路数最多的卫星分组,使每组内卫星的星间测距DOP值最小。仿真结果表明,采用优化算法得到的最优分组时分测距方式对卫星定轨精度有明显改善。

The present polling time division duplex (PTDD)ranging hierarchy of GPS inter-satellite links (ISL)demands being optimized for satellite orbit determination. An improved ranging hierarchy named grouping time division duplex (GTDD ) is presented. Satellite orbit determination precision based on inter-satellite and satellite-to-station ranges is able to be improved by the novel ranging hierarchy in respect of ISL ranging links increasing by grouping ranging of the whole constellation.Aiming at the optimal satellite orbit determination precision,a two-steps algorithm is presented to optimize the satellite grouping.Firstly,the optimal satellite groupings were obtained to achieve the most inter-satellite ranging links.Secondly,the ranging DOP was made the least in each satellite group.Simulation results show that the satellite orbit determination precision can be improved greatly from the two-steps algorithm.