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At present, many Beidou tracking stations over the world have been set up for international GNSS Monitoring and Assessment System (iGMAS) and a pilot project named Multi-GNSS Experiment (MGEX) is implemented. Each station was equipped with the Multi-GNSS receivers which are able to track BeiDou as well as GPS signals. Furthermore some of stations were equipped with high-precision atomic clocks as...
This paper presents a time synchronization method based on the COMPASS code measurements in combination with two-way transfer ranging, which results the clock offset between COMPASS GEO satellite and the ground station. The clock offset of COMPASS G3 satellite on board is computed by using the data observed on October 2010. In order to verify the accuracy of this method, the results are compared with...
The structure of an all digital phase-locked loop technology, ADPLL, is proposed in this paper. And the digital phase detector, digital filter loops and digital-controlled oscillators are gradually analyzed. The time order graphs of all modules are presented. In the way of linear approximation, the first-order and second-order mathematic models of ADPLL are given, as well as the control methods. The...
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