An Autonomous Orbit Determination Method for Space Service Volume with Deficient GPS Measurements

摘要

With an increasing number of artificial satellites and spacecraftrnlaunched in the last few years, ground based orbit determination systems,rnsuch as normally used Satellite User Ranging(SLR) is encountering withrnoverload work and rapidly growing cost, GPS based autonomous orbitrndetermination is playing a more and more important role, especially forrnLow Earth Orbit (LEO) satellites in Terrestrial Service Volume (TSV).rnHowever, GPS is not able to be utilized in Space Service Volume (SSV)rnbecause of the fact that available GPS satellites would be deficient in manyrnconditions. In order to realize GPS based autonomous orbit determination inrnSSV for High Earth Orbit (HEO) and Geosynchronous (GEO) satellites, anrnautonomous orbit determination method with deficient GPS measurementrncomplemented with orbital dynamics and altitude measurements from otherrnsensors is proposed in this study. A simulation demonstrates that thisrnapproach is able to provide hundred-meter level positioning precision withrnonly two available satellites, whereas, the satellite position would diversernbeyond more than 10,000 m if only utilizing orbit dynamics, whichrnauthenticates a satisfactory performance of the proposed method. Thernproposed autonomous orbit determination approach is expected to be able tornprovide services to HEO and GEO satellites as well as other deep spacernexploration spacecraft in GPS SSV.