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TRIPLE DIFFERENCE APPROACH TO LOWEARTH ORBITER PRECISION ORBIT DETERMINATION
JayHyounKwon,염재홍,이동천,DorotaA.Grejner-Brzezinska 한국우주과학회 2003 Journal of Astronomy and Space Sciences Vol.20 No.1
Aprecisekinematicorbitdetermination(P-KOD)procedureforLowEarthOrbiter(LEO)usingtheGPSion-freetripledifferencedcarrierphasesispresented. Becausethetripledifferenced observables provide only relative information, the rst epochs positionsof the orbit should be held xed. Then, both forward and backward ltering was ex-ecuted to mitigate the effect of biases of the rst epochs position. P-KOD utilizesthe precise GPS orbits and groundstations data from International GPS Service (IGS)so that the only unknown parameters to be solved are positions of the satellite at eachepoch. Currently,the3-DaccuracyofP-KODappliedtoCHAMP (CHAllengingMin-isatellite Payload) shows better than 35 cm compared to the published rapid scienticorbit (RSO) solution from GFZ (GeoForschungsZentrumPotsdam). The data screen-ing for cycle slips is a particularly challenging procedure for LEO, which moves veryfast in the middle of the ionospheric layer. It was found that data screening usingSNR (signal to noise ratio) generates best results based on the residual analysis usingRSO. It is expectedthat muchbetteraccuracyareachievablewith renedprescreeningprocedure and optimized geometry of the satellites and ground stations.
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