Pulse or digital communications – Receivers
Reexamination Certificate
2011-04-05
2011-04-05
Ahn, Sam K (Department: 2611)
Pulse or digital communications
Receivers
Reexamination Certificate
active
07920650
ABSTRACT:
In a system for characterizing a satellite clock in a satellite, the satellite has a transmitting device that emits a transmission signal at a transmission frequency indicative of a state of the satellite clock, and a receiver clock which has a higher precision than the satellite clock. A receiving device is configured to receive the transmission signal and to determine a received signal therefrom, as well as a received signal frequency and/or phase, using the receiver clock. Finally, an evaluation device is configured to determine a frequency offset, drift, and/or an Allan deviation of the transmission frequency from the received signal frequency and/or the received signal phase. The evaluation device determines the stability of the satellite clock, or the validity of its time indication, from the determined frequency offset, frequency drift, and/or the Allan deviation, to thereby characterize the satellite clock.
REFERENCES:
patent: 4918609 (1990-04-01), Yamawaki
patent: 5506781 (1996-04-01), Cummiskey et al.
patent: 6373432 (2002-04-01), Rabinowitz et al.
patent: 2005/0089128 (2005-04-01), McReynolds
patent: 2007/0279279 (2007-12-01), Meyers et al.
Jorgensen, P.S., “Obtaining the short term stability of the GPS satellite clocks from tracking data”, Institute of Navigation, National Technical meeting, San Diego, CA, Jan. 17-19, 1984, Proceedings (A85-38526 17-04), Washington, D.C. Institutes of Navigation, 1984, pp. 235-239.
Kristine M. Larson et al., “Carrier-Phase time Transfer”, IEEE Transactions on Ultrasonics, Ferroelectrics, And Frequency Control, vol. 46, No. 4, Jul. 1999, pp. 1001-1012, ISSN: 0885-3010.
Jay Oaks et al., “Comparative Analysis of GPS Clock Performance Using Both Code-Phase and Carrier-Derived Pseudorange Observations”, Proceedings of the 36thAnnual Precise Time and Time Interval Systems and Applications Meeting, Dec. 7-9, 2004, pp. 431-440.
P. Daly et al., “Characterization of NAVSTAR GPS and Glonass On-Board Clocks”, Aerospace and Electric Systems magazine, IEEE, vol. 5, Issue 7, Jul. 1990, pp. 3-9, ISSN: 0885-8985.
Thomas B. McCaskill, “Analysis Of The Frequency Stability History of GPS Navstar Clocks”, Proceedings of the 1997 IEEE international Frequency Control Symposium, May 28-30, 1997, pp. 295-303, ISBN: 0-7803-3728-X.
Mudrak Alexandre
Trautenberg Hans L.
Ahn Sam K
Astrium GmbH
Crowell & Moring LLP
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