Communications: directive radio wave systems and devices (e.g. – Directive – Including a satellite
Reexamination Certificate
2011-04-12
2011-04-12
Tarcza, Thomas H (Department: 3662)
Communications: directive radio wave systems and devices (e.g.,
Directive
Including a satellite
C342S442000
Reexamination Certificate
active
07924221
ABSTRACT:
A method for monitoring the integrity of satellite navigation system includes a first detection of integrity problems, in which the same entity of a navigation signal from a particular satellite is received at different sites, and evaluated to estimate the error of the entity and the error made during the error estimation process. In a second detection, navigation signals received from a specific satellite are measured and evaluated to estimate the error of the entity and the error in the error estimation process. Finally, in a third detection, several navigation signals from different satellites are measured, and evaluated to estimate the error of the entity and the error made in the error estimation process. Integrity problems which are detectable in the first and second detections are taken into account only if it is probable that they occur during the third detection, and have not been discovered during the first and second detection.
REFERENCES:
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Cristina Pecchioni et al., “Combined Galileo and EGNOS Integrity Signal: a multisystem integrity algorithm”, XP-002505280, GNSS, 2007 pp. 1-11.
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Stefan Vieweg, “Integrity Monitoring and Failure Identification within an Integrated Satellite-/Inertial Navigation System”, Institute of Flight Guidance and Control, 1994, pp. 755-761.
Astrium GmbH
Crowell & Moring LLP
Liu Harry
Tarcza Thomas H
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