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In order to improve orbit determination accuracy of communications satellites in the interference source localization system, a accurate orbit determination technique for a communication satellite has been studied. The principles of DTOA and DFOA measurement techniques have been studied in details, and also the orbit mechanics model of the GEO satellite in the interference source localization system is developed in this paper. High-accuracy numerical integrator and parameter estimation method have been employed in the orbit determination. Through simulation and measured data processing and analysis, the RMS of orbit reaches hundreds of meter, which is better than the current published results in related fields. The work confirms that the orbit determination method in the article is validating, and also could be an approach to the related program. [ABSTRACT FROM AUTHOR]