Estimation method of the X-ray Pulsar direction error based on Beidou system

Pulsar direction error is an important aspect of astronomy research and is also a main factor which affects the navigation based on X-ray pulsars. In order to achieve more accurate pulsar direction parameters, this paper proposes a new estimation method for X-ray pulsar direction error based on the navigation data of Beidou system. As the location of pulsar is extremely stable, we can assume the pulsar location error as a CP model. Combine the measurement data with the position data of Beidou satellites, we build corresponding Kalman filter and utilize the Monte-Carlo simulation trails to verify the validity of the method. The simulation results show that the pulsar direction error could be accurately estimated by this method and the accuracy of pulsar position is well improved. Besides, compared with the single-satellite system for estimation method, the multi-satellites system is more effective in estimating the pulsar direction error.