The Research Of The Autonomous Orbit Determination Of Navigation Constellation Based On Ground-based Anchor

The traditional way of satellites determination is not catered the determination ofthe navigation satellites constellation which includes many navigation satellites with thenumber of satellite increasingly in recent years. As the number of satellites raised, theground-stations wouldn’t bear the measuring and controlling burden. Many scientistsfocused on developing the technology of the constellation autonomous navigation in thepast few years. The burden of the ground-station is alleviated and the ability ofnavigation battle is enhanced with the technology of the autonomous navigation. In thispaper, the technology of the autonomous navigation based anchor station is researched;followings are the main study in this dissertation.1) The method of the determination of navigation constellation based anchorstation is studied. Based on the model of the satellite to satellite tracking, the Ephemerisobservability in autonomous navigation only with inter-satellites measurement isanalyzed, and the solution is given by the mean of the anchor station to settle theproblem of the observability. The models of the whole net algorithm and distributedalgorithm are compared in concept. The state function and measurement function of thetwo models are modeled by theoretic analysis.2) The application of robust estimation in distributed algorithm of autonomousnavigation constellation is presented. The robust estimation is inducted to detect andresist the influence of gross error in determination of the satellites.3) User Range Error is explained comprehensively in concept, and its computablemodel is derived from the weighting method of Calculating for single satellite and allsatellites in the navigation constellation. The result of URE is verified by the means ofsimulation.4) The technology of distributed autonomous time synchronization of thenavigation constellation is investigated. The different performance between Allanvariance and Hadamard variance is compared firstly, and then the model of autonomoustime synchronization is derived. The feasibility of time synchronization based on anchorby distributed algorithm was simulated.