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The performance analysis of TWOTFT with the two terminal equipments at the two remotes sites has been implemented and one way time transfer through optical fiber has been designed and the performance evaluation, demonstration, and verification experiments in short distance have been realized and its uncertainty has been evaluated as roughly 2.1 ns.
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...
A novel transceiver of combining (n, n(n-1), n-1) permutation group code (PGC) with multiple frequency shift keying (MFSK) modulation was designed for high reliability against non-hostile man-made multiple frequency interferences and multipath fading on wireless channels. The combination of PGC and MFSK generates a new coded modulation scheme, named as time-frequency shift keying (TFSK), which can...
TWOTFT has been studied and implemented according to the similar principles to those of TWSTFT. We initially constructed the experiment system for TWOTFT and done some experiments such as time and frequency transfer through the laboratory optical fiber and the real optical fiber links including the real link with 109 km length at NIM. We can get the time stability of less than 6 ps/s and 0.9 ps/100s,...
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.
High-precision time synchronization is a basic element in some areas of aeronautical engineering, such as satellite navigation and deep space exploration. It is more accurate and stable to use the optical fibers while performing time frequency transfer than using other media such as GNSS common view and two-way satellite time frequency transfer. The frequency transfer is the main focus of the current...
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