GNSS Time and Frequency Transfer
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Abstract
Global Navigation Satellite System (GNSS) positioning measures time intervals of travelling signals from satellites to ground station receivers. Its precision is based upon characteristics and performances of atomic clocks onboard and synchronisation difference determinations at receiving station on earth at nanosecond level. Timing is essential for GNSS. On the other hand, GNSS is widely used for atomic clocks’ time and frequency comparisons especially in time and frequency metrology. Timing GNSS station is also used for precise positioning and geodetic datum determinations. This paper explains principle of GNSS time and frequency disseminations, observations, data processing and some results as to determine a second in the International System of Units (SI), a Coordinated Universal Time (UTC) and the official local time or Thailand Standard Time (TST).
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