Simulation Of Single X-ray Pulsar Orbit Determination On XPNAV-1 Measured Data

Pulsar navigation is used for timing,positioning,orbit determination,attitude determination and other services by receiving periodic electromagnetic signals radiated by pulsar.Compared with other existing navigation methods,pulsar navigation has the advantages of strong anti-jamming ability,good environmental adaptability and independence,and can be used in deep space navigation.At present,China 's XPNAV-1 satellite has carried the payload of X ray pulsar,and successfully completed the observation of Crab pulsar,which provides important data support for the study of the orbit determination performance of pulsar.In this paper,aiming at the photon data of Crab pulsar collected by xpnav-1 satellite,the orbit determination performance of pulsar is simulated and analyzed.First of all,the basic theory of pulsar navigation and the theory of time system conversion are described.According to the space-time system conversion relationship,the method of pulse contour reconstruction is discussed,and the pulse contour generation of the photon data of Crab pulsar on xpnav-1 satellite in the solar system centroid system is completed.Secondly,based on the recovered pulse profile,the measurement model of pulsar is established.Combined with the dynamic orbit recursion,the simulation of single pulsar orbit determination process of xpnav-1 satellite is completed by extended Kalman filter,and the preliminary performance of single pulsar orbit determination is obtained by comparing with the precise orbit determination data of xpnav-1 satellite.Finally,for the measured data of limited length,the pulse wheel The simulation parameters of single star orbit determination are optimized,and the orbit determination error of pulsar is between 13.5 km and 14 km.