Methods and apparatuses for reducing errors in the measurement of the coordinates and time offset in satellite positioning system receivers
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United States of America Patent
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-
Jan 8, 2002
Grant Date -
N/A
app pub date -
Mar 9, 2000
filing date -
Mar 12, 1999
priority date (Note) -
Expired
status (Latency Note)
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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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