Method and apparatus for integrity communication in a navigation satellite system
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United States of America Patent
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Dec 6, 2011
Grant Date -
Jun 10, 2010
app pub date -
Dec 9, 2009
filing date -
Dec 10, 2008
priority date (Note) -
Expired
status (Latency Note)
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Abstract
For integrity communication, a navigation satellite system has a space segment with satellites that emit navigation signals for reception and analysis by user systems, and a ground segment with observation stations that monitor the satellites. The ground segment controls cause distribution of integrity information concerning the satellites to user systems with the navigation signals. The integrity information has a first SISMA value and a second broadcast SISMA value for the accuracy of the satellite monitored by the ground segment. The second broadcast SISMA value takes into account a failure of an observation station of the ground segment, and a threshold value for the second broadcast SISMA value is provided. The threshold value with the integrity information for a satellite is transmitted instead of the second broadcast SISMA value when the latter exceeds the threshold value and the first SISMA value is lower than the threshold value for the satellite. The integrity information to be transmitted when the second broadcast SISMA value and the first SISMA value for the satellite each exceed the threshold value.
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