Abstract
In recent years, many low-orbit satellites have been widely used in the field of scientific research and national defense in China. In order to meet the demand of high-precision satellite orbit in China’s space, surveying and mapping, and other related fields, navigation satellites are of great significance. The UKF (unscented Kalman filter) method is applied to space targets’ spaceborne GPS autonomous orbit determination. In this paper, the UKF algorithm based on UT transformation is mainly introduced. In view of the situation that the system noise variance matrix is unknown or the dynamic model is not accurate, an adaptive UKF filtering algorithm is proposed. Simulation experiments are carried out with CHAMP satellite GPS data, and the results show that the filtering accuracy and stability are improved, which proves the algorithm’s effectiveness. The experimental results show that the Helmert variance component estimation considering the dynamics model can solve the problem of reasonable weight determination of BDS/GPS observations and effectively weaken the influence of coarse error and improve the accuracy of orbit determination. The accuracy of autonomous orbit determination by spaceborne BDS/GPS is 1.19 m and 2.35 mm/s, respectively.
Highlights
In satellite navigation system, the accuracy of satellite orbit position will directly affect the calculation of user position
(2) Simulation experiments are carried out with CHAMP satellite GPS data, and the results show that the filtering accuracy and stability are improved, which proves the effectiveness of the algorithm
The onboard BDS and GPS simulation data generated by high dynamic signal simulators are used to analyze the autonomous orbit determination accuracy of BDS/GPS with different weight determination strategies, and the autonomous orbit determination accuracy of GPS, BDS, and BDS/GPS is analyzed
Summary
The accuracy of satellite orbit position will directly affect the calculation of user position. In order to launch BeiDou satellite navigation system and related application research, our country provides wide-area and local-area reference station networks in the Asia-Pacific region and the Wuhan Beidou satellite navigation system (9 stations, 6 stations in the country, and no data outside the Indonesian station), and for the first time, the precise orbit of BeiDou navigation satellite is better than 10 cm and high-precision satellite clock error. (3) e experimental results show that the Helmert variance component estimation considering the dynamics model can solve the problem of reasonable weight determination of BDS/GPS observations and effectively weaken the influence of coarse error and improve the accuracy of orbit determination
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