The Research On Orbit Prediction For Lunar Space Probe

Orbit prediction of spacecrafts is considered as a forerunner of mission analysis, technology coordinating, scheme constitution and target tracking of ground telemetering, tracking and control (TT&C) system of aerospace engineering."Chang'e"project is a newly-developed important space system engineering which undertakes the mission of launching China's lunar probe satellites. The flying orbit of"Chang'e-1"satellite is a prominent mark which differs from other space engineering. To ground TT&C system, orbit prediction of lunar probe spacecrafts is an important research subject. The main content of this paper is as follows:The general situation of space tracking ship is introduced; the computing relation of tracking parameter of radio tracking equipment which is fixed to the TT&C ship's deck is analyzed.Takingthe earth central body as an example, the preliminary theory and quasi-averaging elements method to solve perturbation equation is dissertated; a time system and a coordinate system adaptable to the lunar probe satellite together with their conversion relation are introduced.Physics situation of the moon is described; perturbation analysis of the lunar probe satellite is presented, including its analysis computation and numerical computation.The computing process of the lunar probe satellite orbit prediction and moon sheltering is put forward ; the simulation computation of both the analysis method and numerical method is made and the computing conclusion is summarized.The research and test of this paper shows that the accuracy of both the analysis method and the numerical method of lunar probe satellite orbit prediction can meet the guiding requirements of TT&C ship's radio tracking equipments, and numerical method proves to be an order of magnitude higher than analysis one. Numerical method can be applied in tracking and control project planning for lunar probe satellite to complete a precise capture of the moon and orbit control while analysis method can be used in real-time guiding computation.