Communications: directive radio wave systems and devices (e.g. – Directive – Including a satellite
Reexamination Certificate
2007-10-23
2007-10-23
Issing, Gregory C. (Department: 3662)
Communications: directive radio wave systems and devices (e.g.,
Directive
Including a satellite
Reexamination Certificate
active
11063782
ABSTRACT:
A system to provide navigation signals to a space vehicle includes an uplink system for a geostationary earth satellite having clock steering derived from smoothed receiver clock error, long term clock error average, and long term clock offset average information. A proportional-integral-differential controller can be used to generate clock adjustment commands to a frequency standard clock.
REFERENCES:
patent: WO 99/18677 (1999-04-01), None
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Po-Hsin Hsu, Laura Cheung, Mohinder Grewal, Prototype Test Results of L1/L5 Signals of Future GEO Satellites, Sep. 2003, pp. 1-7.
Po-Hsin Hsu and Thomas W. Plummer, A New Algorithm For WAAS GEO Uplink Subsystem (GUS) Clock Steering, Sep. 9-12, 2003, pp. 1-9, California State University, Fullerton, California.
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Dr. A. J. Van Dierendonck, AJ Systems, Planned GPS Civil Signals and Their Benefits to the Civil Community, Apr. 2003.
Grewal Mohinder S.
Hsu Po-Hsin
Daly, Crowley & Mofford & Durkee, LLP
Issing Gregory C.
Raytheon Company
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