Time-varying characteristics analysis of BDS Kepler orbit parameters

Abstract：The analysis of satellite orbit parameter characteristics has important reference value for satellite orbit state evaluation, operation and maintenance.The defects of orbit characteristics of Beidou broadcast ephemeris were analyzed, and a new idea of Kepler orbit parameter analysis based on Beidou precision orbit was proposed.It transformed ground system precision coorfinate and velocity of the Beidou to the air solid system and inverted Kepler 6 parameters, then time-varying characteristics of Kepler parameters were obtained by analyzing time-frequency.The idea was applied to analyze the orbit characteristics of Beidou satellite orbit from 2014 to 2017.The results showed that there were jumps between eccentricity, inclination angle, ascending node right ascension, perigee angular distance of the geostationary orbit satellites and the long semi-axis and the near-point angle of tilt-synchronous orbit satellite;there were significant linear trends in the inclination angle, eccentricity, ascending node right ascension and the long semi-axis of tilt-synchronous orbit satellite, the perigee angle distance, the near-point angle of the 3 types of satellites, and the perigee angle distance and near-point angle of the medium-orbiting satellites;all Kepler 6 parameters of three kinds of satellites have significant periodic features.

Keyword：Beidou navigation satellite system;precise orbit;Kepler orbit parameter;time series analysis;