An autonomous navigation method for GEO satellites is presented. This method takes advantage of the characteristics of GEO satellites to overcome the shortcoming of the X-ray pulsar measurements: The satellite's orbit dynamics equation is built up in the Earth-fixed reference frame, so that the equation is weakly non-linear and the extended Kalman filter (EKF) is used in this method in spite of the long observation time of X-ray pulsars. Based on the geopotential model, the obit dynamics equation expressed in the Earth-fixed frame is obtained. The phase measurements of X-ray pulsars are used by EKF to best estimate the satellite's position and velocity. Numerical simulation is done. It is shown that the navigation results attain convergence quickly if the X-ray pulsar measurements are introduced into the estimation, and the accuracy during the intervals without pulsar measurements is also at a satisfying level.


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    Title :

    An autonomous navigation method for GEO satellites using X-ray pulsars


    Contributors:
    Liangwei Huang, (author) / Bin Liang, (author) / Tao Zhang, (author) / Wenfu Xu, (author)


    Publication date :

    2010-06-01


    Size :

    761971 byte




    Type of media :

    Conference paper


    Type of material :

    Electronic Resource


    Language :

    English





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