CAJ | 학술논문

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。
현유적GPS성간련로륜순시분측거체제미침대정궤성능진행우화。대륜순시분측거체제진행개진，제출료일충신적분조시분측거체제，통과대정성좌소유위성진행분조측거래제고성간측거련로수량，종이제고성지성간연합정궤정도。이정성좌평균정궤정도최우위목표，제출료량보우화산법，득도성간총측거련로수최다적위성분조，사매조내위성적성간측거DOP치최소。방진결과표명，채용우화산법득도적최우분조시분측거방식대위성정궤정도유명현개선。
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.