A client-server based data communication scheme was developed in order to es- tablish a permanent and dynamic real-time GPS network for relative time and fre- quency transfer. The Kalman-ˉlter-based real-time processor uses station pairwise common-view phase observations for estimating the receiver clock and tropospheric parameters. Orbit determination is based on real-time broadcast ephemerides and station coordinates are ˉxed and known. Real-time estimates were compared with clock solutions from postprocessed data resulting in standard deviation values in the order of 50 ps for short baselines.
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