US Patent No: 6,337,657
Number of patents in Portfolio can not be more than 2000
Methods and apparatuses for reducing errors in the measurement of the coordinates and time offset in satellite positioning system receivers
Stats
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Jan 8, 2002
Issued date -
Mar 9, 2000
filing date -
09/522,323
serial no -
In Force
status
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Abstract
Disclosed are methods and apparatuses for generating the estimates of receiver's coordinates and/or time offset for a moment of time t.sub.n without large errors caused by short-term shading of a part of the observable global positioning satellites and also without large dynamic errors caused by the receiver movement. The receiver may be stationary or mobile (i.e., rovering). A set of snapshot-solution values for the position coordinates and time offset of the receiver at the time moment t.sub.n, and a set of predicted values for the position coordinates and time offset of the receiver at the time moment t.sub.n are generated. The accuracy of each of these sets are determined, and a set of refined estimates for the position and time offset of the receiver is generated based the snapshot solution values, the predicted position values, and the accuracies.
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First Claim
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International Classification(s)
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Cited Art
| Patent Info | (Count) | # Cites | Year |
|---|---|---|---|
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| 5,296,861 Method and apparatus for maximum likelihood estimation direct integer search in differential carrier phase attitude determination systems | 120 | 1992 | |
| 5,590,043 Satellite positioning system filter | 28 | 1993 | |
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| 5,323,163 All DOP GPS optimization | 59 | 1993 | |
Patent Citation Ranking
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