The Algorithms Of Compass Precise Orbit Determination Based On SLR And Pseudorange Observations

Now China’s Compass Navigation Satellite System is under construction. Preciseorbit determination is the premise of precise positioning for Compass navigationsatellite system, meanwhile the orbital precision is an important factor for theperformance of the navigation system.Currently, the GPS precise orbit determinationhas achieved the centimeter level. Until now Compass navigation satellite system hasnot accomplished, the observation stations are mainly distributed in the domestic, andthe observing length is short. In view of this situation, it is a hotspot and difficultproblem for further study precise orbit determination algorithm and mathematicalmodels to improve orbital precision and real-time performance of Compass navigationsatellite system.This paper systematically studied basic theoretical models and algorithms of theprecise orbit determination for Compass navigation satellite system based on the SLRand Pseudorange, and formed a set of software applied to precise orbit determination ofCompass navigation satellite system.First of all, the paper describes the theoretical approach of the SLR datapreprocessing as well as the hit point calculation error model. The experiment resultsindicated that the pre-processed data could reach decimeter level, which provided astrong support to the determination of precise orbit. The second, the paper researchedJPL DE405planetary ephemeris, which is used to calculate the position between the sunand the moon. The paper achieved the conversion of the time system and the coordinatesystem to unify space-time system.The third, the paper researched and achieved thealgorithms of synchronous observation for orbit determination based on single SLR andmulti-station pseudorange. The experimental results indicated that these two highprecision algorithms can be used as initial value of orbit improving. The fourth, thepaper researched the perturbation model of the dynamic orbit, detailed the model ofprinciple, given formula and the partial derivative, and analyzed the influence series ofeach perturbation for navigation satellite orbits.The fifth, the paper introduced the basicprinciples of orbit improvement, given the equation of motion of the satellite navigation,derived the equation of state and equations of motion of the satellite in detail, andstudied the solution of the weighted least squares estimation of ill-conditioned equation, concluded the high precision of the method to solve the ill-conditioned equations ofGivens-Gentleman, by comparing the method of Givens-Gentleman and Interationmethod.The sixth, on the basis of the theory, algorithms and models, the paper formed aseries of Compass navigation satellite system precise orbit determination software basedon the SLR and pseudorange observations data. The orbit determination precise of thesoftware could achieve the meter-scale through the actual observation data.