Short-Arc Kinematic Orbit Determination Based on Ephemeris Fitting

Based on conventional statistical POD theory,precise orbit determination(POD) for navigation satellite could hardly be realized during the period of orbit maneuvering and recovery.Short-arc kinematic orbit determination approach based on 10 ephemeris parameters fitting was proposed firstly in the field of satellite navigation,with theory model and estimation method being established and deducted in this paper.Physical characteristic of satellite orbit was reflected in this approach,with high precision of velocity and orbit prediction.And nearly real time computation could be realized without data accumulation,which overcomes divergence of dynamical orbit determination approach,and obtains satellite velocity information.A POD test based on short-arc kinematic orbit determination approach was carried out,using measurements from COMPASS M-01 satellite.Results show that:position accuracy is better than 10 meters,velocity accuracy is better than 2 centimeters per second,and 5-minute orbit prediction accuracy is 15.02 meters,which could meet demands of Radio Navigation Satellite System(RDSS) and realize satellite precise orbit determination with short-arc tracking.