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A new time and frequency transfer system compatible with BDS has been developed at NIM, and two of them are in operation at the BIPM since Jan 2017. Experiments with this equipment have been implemented to characterize the time and frequency transfer by BDS. This includes analysis of the satellites signal coverage statistics in the BIPM area, the error correction, the measurement noise of the NIM...
The experiments and results of these calibation campaigns in the frame of APMP from 2014 to 2016 have been reported and the experiment setups and the corresponding delay measurements have been discussed, and the uncertainty has been evaluated for the campaigns.
Since 2014 NIM has also started to design and develop one kind of homemade calibration system for the time link calibration on the basis of NIMTFGNSS-2 receiver. The system has been constructed preliminarily and calibrated, and in the near future, with this calibrator we might implement the calibration campaigns of some TAI links under the APMP(Asia Pacific Metrology Programme) scheme.
The time transfer link between NIM and PTB was for the first time calibrated using a travelling GPS receiver developed by NIM The calibration uncertainty was estimated to about 2 ns. The result obtained could be compared to the result derived from differential calibrations made by BIPM in previous years. Both results agree well within 1 ns.
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