Precision phase comparison via communication satellites using loop-back tones
Article first published online: 7 DEC 2012
Copyright 1983 by the American Geophysical Union.
Volume 18, Issue 2, pages 216–224, March-April 1983
How to Cite
1983), Precision phase comparison via communication satellites using loop-back tones, Radio Sci., 18(2), 216–224, doi:10.1029/RS018i002p00216., and (
- Issue published online: 7 DEC 2012
- Article first published online: 7 DEC 2012
- Manuscript Accepted: 16 NOV 1982
- Manuscript Received: 17 AUG 1982
Phase comparison of remote oscillators by tone transmission via communication satellites is considered. By introducing loop-back tones at each station to produce a virtual downlink frequency equal to the uplink frequency, the path phase between two stations is made independent of the direction of transmission. All nondispersive path effects are then canceled by using reverse path transmissions. The effective period for phase comparison is the mean period of the uplink and downlink transmissions. This represents a 2–order of magnitude increase in effective frequency over the previously used two-tone method. The precision of phase comparison via satellites is now limited by uncertainties of ionospheric effects.