Communications: directive radio wave systems and devices (e.g. – Directive – Including a satellite
Reexamination Certificate
2005-02-01
2005-02-01
Blum, Theodore M. (Department: 3662)
Communications: directive radio wave systems and devices (e.g.,
Directive
Including a satellite
C701S213000, C455S012100, C455S427000
Reexamination Certificate
active
06850187
ABSTRACT:
The present invention is a system for providing GPS users with a high level of confidence in the integrity and accuracy of received GPS signals. The system provides a means for each GPS satellite itself to verify the accuracy and/or integrity of its own operations by calculations and processing internal to the GPS satellite and by crosslink communications with other GPS satellites in the GPS constellation. After a GPS satellite verifies the accuracy and/or integrity of its own signals, the GPS satellite transmits an integrity message to all GPS users in view of the satellite. The integrity message can alert GPS users to a loss of integrity or accuracy in the GPS signals. Alternatively, the integrity message can contain information to correct errors in the GPS signals. The integrity message can be incorporated into the existing GPS navigation message transmitted by GPS satellites, or the integrity message can be transmitted over a separate channel such as the planned L5 band channel.
REFERENCES:
patent: 5046006 (1991-09-01), Revord et al.
patent: 5490076 (1996-02-01), Rawicz et al.
patent: 6088571 (2000-07-01), Kane et al.
patent: 6320536 (2001-11-01), Sasaki
patent: 6429808 (2002-08-01), King et al.
Wolf,Onboard Autonomous Integrity Monitoring using Intersatellite Links, Sep. 19-22, 2000, ION GPS 2000, Salt Lake City, UT, pp. 1572-1581.
Blum Theodore M.
Lockheed Martin Corporation
Townsend and Townsend / and Crew LLP
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