XU Tianhe,HE Bei,WANG Dixing.Robust Adaptive Orbit Determination and Time Synchronization for Lunar Navigation Constellation[J].Geomatics and Information Science of Wuhan University,2026,51(10):2056-2070.
XU Tianhe,HE Bei,WANG Dixing.Robust Adaptive Orbit Determination and Time Synchronization for Lunar Navigation Constellation[J].Geomatics and Information Science of Wuhan University,2026,51(10):2056-2070.DOI:10.13203/j.whugis20260310
Robust Adaptive Orbit Determination and Time Synchronization for Lunar Navigation Constellation
To support the long-term autonomous operation of lunar navigation constellation and meet the positioning
navigation and timing requirements of cislunar space
a hybrid lunar navigation constellation integrating elliptical lunar frozen orbit (ELFO) and distant retrograde orbit (DRO) satellites is constructed. Low earth orbit satellites and BeiDou navigation satellite system satellites are employed as Earth-side space-based reference nodes
and autonomous orbit determination and time synchronization based on dual one-way inter-satellite ranging are investigated.
Methods
2
On the basis of the extended Kalman filter (EKF)
robust adaptive Kalman filtering (RAKF) is introduced to suppress observation outliers and state anomalies by adjusting the observation covariance and predicted-state covariance
respectively.
Results
2
Simulation results show that
under nominal conditions
the three-dimensional orbit determination accuracies of the ELFO and DRO satellites are 6.3 m and 14.1 m
respectively
while the corresponding time synchronization accuracies are 0.105 ns and 0.118 ns. Under observation anomalies of 5 m
10 m
and 20 m
RAKF improves the three-dimensional orbit determination accuracy of the ELFO satellites over EKF by 50.0%
76.6%
and 84.0%
respectively
while the corresponding time synchronization accuracy is improved by 34.07%
95.53%
and 98.24%. For the DRO satellite
the orbit determination accuracy is improved by 73.6%
74.4%
and 76.9%
respectively
and the time synchronization accuracy is improved by 51.29%
96.46%
and 97.64%. Under the state-anomaly scenario
RAKF improves the three-dimensional orbit determination accuracy of the ELFO satellite from 331.5 m to 18.6 m compared with EKF.
Conclusions
2
The results demonstrate that the constructed hybrid constellation can achieve stable autonomous orbit determination and sub-nanosecond time synchronization
and that RAKF can effectively improve the autonomous orbit determination and time synchronization performance of lunar navigation constellations under anomalous conditions.
关键词
Keywords
references
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