Location-determination method and apparatus
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United States of America Patent
Stats
-
Feb 25, 2003
Grant Date -
Jul 25, 2002
app pub date -
Jun 20, 2001
filing date -
Dec 4, 2000
priority date (Note) -
In Force
status (Latency Note)
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Abstract
Some embodiments of the invention provide a location-determination system that includes several transmitters and at least one receiver. Each transmitter transmits a signal that includes a unique periodically-repeating component, and the receiver receives a reference signal. Based on the received reference signal, the location-determination system identifies an estimated location of the receiver as follows. For each transmitter in a set of transmitters, the system computes a phase offset between the received reference signal and a replica of the transmitter's periodically-repeating component. The system also identifies an approximate location of the receiver and an approximate receive time for the received signal. The system then uses the identified approximate location and time, and the computed phase offsets, to compute pseudoranges for the set of transmitters. Finally, the system identifies the estimated location of the receiver by using the computed pseudoranges.
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