Autonomous navigation of the Global Navigation Satellite System (GNSS) is a new technology. As we know,satellites of GNSS may lose track of the ground tracking system in some special conditions. Satellite constellation ofthe GNSS should complete orbit determination and time synchronization without ground-based tracking data in thisspecial condition. Several problems of autonomous orbit determination using only Satellite-to-Satellite Tracking(SST) data will be discussed in this paper. The bias of the state parameters (position-velocity vectors of satellites)can be controlled by orbit determination using only SST when errors of initial orbit and force model are not too large.The result of the orbit determination will not be good if the errors of the priori information are too large. However,SST cannot restrict the net rotation of the whole constellation in orbit determination, hence the errors caused by netrotation will be enlarged when the grand-tracking data is absent. The most important force model error inautonomous orbit determination is the solar radiation pressure (SRP) error. The result of the orbit determination willalso not be good if the error of the SRP is too large. Both analytical and numerical methods will be presented in thispaper to solve the problems in autonomous orbit determination.
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