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Reviewing calibration results over the history since early 1980's among several labs shows very mixed results. The best stabilities of GPS receivers, as given by calibrations, are of the order of a few nanoseconds or better over a year, though many results are quite a bit worse. Absolute calibrations show similar potential, though there are problems. We conclude that more calibrations and standard...
Accurate GNSS (Global Navigation Satellite System) time transfer needs accurate satellite orbit information. Since Nov. 2009, the GLONASS time transfer is introduced in UTC generation. The precise and timely GLONASS orbit information is indispensable for Circular T computation. In this paper, we compare the GLONASS orbits produced by different analysis centers. We study the differences of the products,...
NTSC (National Time Service Center) is responsible for Chinese national time scale generation and has being applied TWSTFT (two-way satellite time and frequency transfer, TW for short) for time transfer since 1998. NTSC was one of the first UTC laboratories practicing TWSTFT in China. From 2002 to 2004, TWSTFT was the major technique for NTSC contributing to UTC. Since 2007, direct NTSC-European TWSTFT...
In this paper we report a new experiment of the combined use of GPS and GLONASS for international time and frequency transfer using TTS-3 multi-channel multisystem receivers. The investigation was carried out on a baseline of about 1400 km between the Astrogeodynamical Observatory (AOS) in Poland and Bureau International des Poids et Mesures (BIPM) in Sèvres. Unlike GPS, almost every GLONASS satellite...
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