Zhiheng Jiang

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Since 2010 ROA has supported the coordination of the EURAMET Technical Committee for Time and Frequency (TC-TF) Project 1156, a response from EURAMET TC-TF to Recommendation 2 of CCTF 2009: to study the characterization of GNSS equipment in use for establishing the time links between institutes contributing with their clocks to TAI. Starting that year, a(More)
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(More)
Two-way Satellite Time and Frequency transfer (TWSTFT) is a primary technique for UTC generation [1]. Only the direct link, the so called UTC link between a Lab(k) and PTB, is used for UTC generation. The numerous redundant links are measured but never used. The concept of the TWSTFT network time transfer has been discussed by several authors [2,3,4,10].(More)
we proposed a virtual GPS receiver model generated from a multi-receiver ensemble. The time difference between local reference and the realization GPS time (REFGPS) of the virtual receiver is the weighted REFGPS results of all calibrated receivers in ensemble. Depending on the numbers of receivers in ensemble, the measurements of the virtual GPS receiver in(More)
Global Positioning System (GPS) carrier-phase (CP) time transfer, as a widely accepted high-precision time transfer method, frequently shows a data-batch boundary discontinuity of up to 1 ns, because of the inconsistency of the phase ambiguities between two consecutive data batches. To eliminate the data-batch boundary discontinuity, several techniques have(More)
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