PULSAR低轨卫星导航星座性能分析研究OA北大核心CSTPCD

Low earth orbit(LEO)navigation satellite system is currently the focus of attention in the field of satellite navigation.In this paper,the LEO navigation constellation named PULSAR proposed by Xona Space Systems,i.e.,a company in the United States,is selected for analysis.Firstly,its development plan and latest progress are introduced.Then,the characteristics and positioning performance of PULSAR constellation at different construction stages are comprehen-sively analyzed from the aspects of ground coverage,space-based global navigation satellite sys-tem(GNSS)monitoring capability,inter satellite link construction and the number of occultation events.The results show that in the stage of full service capability,the PULSAR constellation can provide global coverage capability of more than 8 folds(95%),with a position dilution of precision(PDOP)of better than 3.5(95%),and has the meter level independent positioning ca-pability.Combined with GNSS,the convergence time of precise point positioning(PPP)can be significantly reduced by about 90%.In the meanwhile,with the support of onboard navigation receiver,it can meet the needs of the enhancement of GNSS spatial-temporal accuracy and the monitoring of space weather and integrity.The relevant conclusions obtained can provide valuable reference for the construction of LEO navigation satellite system in China.