Based on the precise orbit determination and the three days continual ranging observation of the GEO artificial satellite,the attainable precision in predicting and determining the orbit of the GEO artificial satellite is studied for the different arc-lengths observation data.

The former is generallyintroduced for the calculation of the ephemeris of a perturbed celestial body in the precision orbit determination, and the latter is included in an orbit determination software pack manufactured by the Center for Space Research at the University of Texas in Austin.

Satellite precision orbit determination (POD) is always one of the focuses in geodesy and geodynamics.

RTOD project realization based on ARM processor;

First the thesis investigated the preliminary knowledge about GPS,and analyzed the requirement of the Auxiliary GPS Data Processing Unit,from chip selection,hardware design to the realization of the software and accomplished the design of the system, and achieved the transplantation of the RTOD(Real Time Orbit Determination) software to the OS based on ARM,and .