Title :
Concepts for high precision time and frequency transfer between Earth and space clocks
Author :
Vessot, R.F.C. ; Antsos, D. ; Young, L.E.
Author_Institution :
Smithsonian Astrophys. Obs., Cambridge, MA, USA
Abstract :
Operation of new space fountain clocks now provides levels of accuracy and frequency stability approaching one part in 1016. We offer some ideas for providing access to this accuracy and stability with Doppler cancelling microwave techniques that employ coherent carrier phase. Corrections for relativistic effects will require continuous tracking of position and velocity at levels of precision that are now realistically expected from Global Positioning System which also provides time transfer capability to enable high precision orbit-to-orbit recovery of phase in the Doppler canceling system
Keywords :
Doppler effect; Global Positioning System; clocks; frequency stability; frequency standards; ionospheric electromagnetic wave propagation; time measurement; transfer standards; Doppler canceling system; Doppler cancelling microwave techniques; Earth clocks; Global Positioning System; accuracy; corrections; frequency stability; frequency transfer; orbit-to-orbit recovery; relativistic effects; space clocks; stability; time transfer; Clocks; Delay effects; Earth; Frequency; Global Positioning System; Propagation delay; Satellite ground stations; Space technology; Space vehicles; Stability;
Conference_Titel :
Frequency and Time Forum, 1999 and the IEEE International Frequency Control Symposium, 1999., Proceedings of the 1999 Joint Meeting of the European
Conference_Location :
Besancon
Print_ISBN :
0-7803-5400-1
DOI :
10.1109/FREQ.1999.840747
