LNE-SYRTE developed two TWSTFT ground stations equipped with SATRE modems to transmit and receive real-time signals from atomic clocks by microwave links through a geostationary communications satellite operated in the Ku-band. This high permormance technique allows to directly compare remote atomic, the geostationary satellite is used as relay for microwave signals.
The goal is twofold: to make a better contribution of French atomic clocks in the implementation of International Atomic (...)
Time and Frequency Transfer
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Two-Way Satellite Time and Frequency Transfer TWSTFT
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Time metrology and GNSS
Since the end of the 80’s, Global Navigation Satellite Systems (GNSS) are available for remote atomic clock comparisons, especially the Global Positioning System (GPS). Continuously transmitted signals are used to measure the offset between one ground clock and one atomic clock on-board, which allows to relate the ground clock to the common system time scale under given conditions. When another station carries out similar measurements simultaneously, the offset between both ground clocks can (...)