Abstract: In order to provide a monitoring and evaluation platform for the navigation constellation autonomous operation, a parallel system consisting with real satellite navigation system is need to be constructed. To solve the orbit calculating problem of high-fidelity simulation system, the theory of parallel systems is introduced, and the high-precision orbit calculation and prediction method is proposed based on the analysis of historical precise orbit.To make the results of orbit calculation keep highly consistent with the actual system,the continuous renewal precise orbit is taken as inputs ,also the time-varying weighting method or PID incremental algorithm is applied to data smoothing. The results show that the satellite orbit calculation results keep an order of decimeter with the actual orbit.

Key words: Satellite navigation, Orbit calculation, Parallel system, Time-varying weighting method, PID incremental algorithm