Compass And Pulsar-based Satellite Autonomous Orbit Determination Method

Satellite autonomous orbit determination is the foundation to ensure that different types of satellites successfully completed their science missions. And it plays a significant role in the reduction of satellite operation cost and the improve of satellite autonomous survival ability, so it is very important for providing human with better and safer service.This paper firstly introduced the theoretical basis of satellite autonomous orbit determination, and briefly analyzed spatiotemporal systems and orbital dynamics model involved in the satellite autonomous. It is focused on the principle of COMPSS and X-ray pulsar navigation, and makes a thorough research on the X-ray pulse signal extraction, pulse time phase model and time transfer etc. Then it makes a thorough analysis on the modulation principles, key characteristics and acquisition principles of BOC signal and its derivative MBOC signal used in COMPASS, and it proposes a BOC signal fast acquisition algorithm based on properties of pseudo random code property and cubic-spline interpolation method. Aiming at filtering divergence, nonlinearities of dynamics model and the real-time problems etc that may happen in satellite autonomous orbit determination process, it deeply analyzes several nonlinear filtering algorithms such as the EKF, UKF, SR_UKF. Through the analysis of visible COMPASS navigation satellites by satellites on different orbit heights, a conclusion can be drawn that if the number of COMPASS navigation satellites is less than four during most time, navigation satellite orbit solver could not be completed. Autonomous orbit determination methods of high-orbit satellites are achieved through the use of X-ray pulsar navigation for this study. On this basis, an autonomous orbit determination method of high-orbit satellites is proposed through federal filtering that combines COMPASS navigation with X-ray pulsar navigation system. Simulations on EKF, UKF, SR_UKF algorithms shows that the integration of the two systems improves the accuracy of orbit determination.Finally, this paper uses high-orbit and low-orbit satellites as objects. The COMPASS system uses pseudo-range and pseudo-range rate as measurements and the X-ray pulsar uses TOA as measurements to design simulation systems and makes analysis. The simulations show the feasibility of autonomous orbit determination based COMPASS and pulsars.