Results and Analysis of BDS Precise Orbit Determination with the Enhancement of Fengyun-3C

doi:10.11947/j.AGCS.2017.20170033

Abstract

Abstract: Global navigation satellite system occultation sounder (GNOS) Fengyun-3C was launched successfully on September 23, 2013, which carried GPS/BDS receiver for the first time. This provides the convenience to study the enhancement results of low earth orbiter satellite (LEO) to BDS precise orbit determination (POD). First the data characteristics and code observation noise of GNOS are analyzed. Then the enhancement experiments in the case of global and regional ground observation stations layout are processed with four POD schemes: BDS single system, GPS/BDS double system, BDS single system with GNOS observations, GPS/BDS double system with GNOS observations. The precision of BDS orbits and clock are compared via overlapping arcs. Results show that in the case of global station layout the along directional precision of GEO satellite has the biggest improvement, with the improvement percentage 60%. Then the precision of cross direction and the along direction of remaining satellites shows the second biggest improvement. The orbit precision of only BDS POD in part of arcs some satellite even suffers a slight decline. The root mean square (RMS) of overlapping clock difference of visible arcs in GPS/BDS POD experiments is improved 0.1 ns level. As to the experiments of regional station layout with 7 ground observation stations, the orbit and clock overlapping precision and orbit predicting precision are analyzed. Results show that the predicting precision of BDS GEO satellites in the along direction is improved 85%. The remaining also has a substantial improvement, with the average percentage 21.7%. RMS of overlapping clock difference of visible arcs is improved 0.5 ns level.

Key words: BeiDou satellite navigation system, LEO, precise orbit determination, GEO, orbit enhancement

CLC Number:

P228

ZENG Tian, SUI Lifen, JIA Xiaolin, JI Guofeng, ZHANG Qinghua. Results and Analysis of BDS Precise Orbit Determination with the Enhancement of Fengyun-3C[J]. Acta Geodaetica et Cartographica Sinica, 2017, 46(7): 824-833.

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