Method and apparatus for determining time in a satellite positioning system
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United States of America Patent
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Aug 13, 2002
Issued Date -
N/A
app pub date -
Oct 6, 2000
filing date -
Feb 3, 1997
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A method and apparatus for determining a reference time associated with a satellite positioning system. In turn, the reference time, in one embodiment, may be used to determine other navigational information. Such navigational information may include, for example, the location/position of a satellite positioning system (SPS) receiver. In one embodiment, a relative velocity between an SPS receiver and a set of one or more satellites is used to determine an offset between time as indicated by the SPS receiver and the reference time. According to another embodiment of the invention, an error statistic is used to determine the reference time. According to yet another embodiment of the invention, two records, each representing at least a portion of a satellite message, are compared to determine time. In one implementation, the SPS receiver is mobile and operates in conjunction with a basestation to determine time and/or other navigational information according to one or a combination of the methods described.
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