Infrastructure-aiding for satellite navigation receiver and method
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United States of America Patent
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-
Oct 29, 2002
Grant Date -
Nov 14, 2002
app pub date -
Feb 28, 2001
filing date -
Feb 28, 2001
priority date (Note) -
Granted
status (Latency Note)
Importance
Abstract
A navigation system comprises a cell-phone, a base cellular telephone site, and a webserver. Each is paired with a GPS receiver. The GPS receiver associated with the cell-phone is aided with information received from the cell-site and webserver that help reduce satellite search uncertainty. Time difference and/or frequency difference measurements are taken with data collected from what the cell-phone and its GPS receiver assume to be accurate time and frequency. Correction information is used in post-processing of the velocity solutions computed by the cell-phone to arrive at more precise determinations for the system.
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