Abstract
A novel method, which is based on the triple-frequency combination and Space-Based Telemetry, Tracking, and Command (STT&C) stations, is proposed in this paper. Considering BeiDou Navigation Satellite System (BDS) Geostationary Orbit (GEO) and Inclined Geostationary Orbit (IGSO) satellites as the STT&C facilities, firstly, we presented the BDS Medium Earth Orbit (MEO) satellites’ precise orbit determination scheme based on triple-frequency combination. Then, we gave the sufficient and necessary conditions about the visibility and the coverage rate calculation model of STT&C to BDS MEO satellite. And then we deduced the model of BDS MEO satellites precise orbit determination based on triple-frequency combination observations. At last, we designed the simulation calculation. The simulation results show that orbit determination of BDS MEO satellite based on STT&C station can be realized at all times. And most of the simulation period time, under the condition of the dm level orbit determination for GEO/IGSO satellites, the position accuracy of the relative orbit determination is better than 4 m, the horizontal accuracy of the relative orbit determination is within 2.5 m, and the vertical accuracy of the relative orbit determination is less than 3.5 m.
Highlights
The orbital determination accuracy of Global Navigation Satellite System (GNSS) satellites is a vital factor in GNSS navigation and positioning
On the basis of these research results, we proposed a tentative idea, which takes BeiDou Navigation Satellite System (BDS) Geostationary Orbit (GEO)/Inclined Geostationary Orbit (IGSO) satellites as STT&C stations and can solve the problem of BDS Medium Earth Orbit (MEO) satellite precision
The method of precise orbit determination of BDS MEO satellites based on STT&C stations was proposed in this paper, the precise orbit determination model based on BDS EWL of B2-B3 combination was deduced, and its orbit determination accuracy was evaluated
Summary
The orbital determination accuracy of Global Navigation Satellite System (GNSS) satellites is a vital factor in GNSS navigation and positioning. We consider BDS GEO/IGSO satellites as STT&C stations and can use the method of multifrequency combination technology to realize the precise orbit determination of BDS MEO satellites ulteriorly. In the moment of t epoch, considering the impact of satellite orbital error, satellite clock error, multipath error, and phase measurement noise, carrier phase observation equations of BDS B1, B2, and B3 signals can be written as ρSk,B1 (t) = ρkS (t) − λB1 ⋅ NkS,B1 (t0) + doSrb (t) + c. In order to realize precise orbit determination for BDS MEO satellites, if we choose the EWL of B2-B3 carrier combination, (17) can be recovered as follows: ΦSk,TC (t) = ρkS (t) − 4.884NkS,TC (t0) + doSrb (t) + c.
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