Realtime Precise Orbit Determination Technology for LEO Mega-Constellation
Supported by GNSS,it analyzed the advantages and disadvantages of solving LEO satellite orbit on the ground or onboard the satellites.The high-fidelity non-conservative force models were applied to the real-time orbit determination algorithm.To separate the kinematic and dynamic orbit determination process had been a great advantage for LEO satellites with much frequent orbital ma-neuvers.The test results showed that the accuracy of accelerations computed from the radiation pressure and atmospheric drag non-conservation force models were around 5 nm/s2.Use the broadcast ephemeris,the real-time orbit determination algorithm could get an accuracy of 0.8 m in the satellites′ positions and 1.1 mm/s accuracy in the satellites′ velocity.When the real-time precise ephemeris of GNSS satellites were provided,the algorithm could get an accuracy of 8 cm in the LEO satellites′ position and 0.1 mm/s in the veloc-ity.The method for real-time orbit determination and orbit prediction in this paper could be used to support the construction of naviga-tion system with the mega-constellations.
LEO mega-constellationreal-time precise orbit determinationnon-conservative force modelsatmospheric dragsolar ra-diation pressure
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