05999124 is referenced by 509 patents and cites 11 patents.

A method and apparatus for processing position information from satellite positioning system satellites and from cellular based communication signals. In one example of a method according to the invention, a SPS receiver receives SPS signals from at least one SPS satellite. This SPS receiver is coupled to and typically integrated with a communication system which receives and transmits messages in a cell based communication system. In this method, a message is transmitted in the cell based communication signals between a communication system and a first cell based transceiver. A time measurement which represents a time of travel of a message in the cell based communication signals between the cell based transceiver and the communication system is determined. Another time measurement which represents a time of travel of the SPS signals is also determined. A position of the SPS receiver is determined from a combination of at least the time measurement which represents the time of travel of a message in the cell based communication signals and from a time measurement which represents a time of travel of the SPS signals. The cell based communication signals are capable of communicating data messages in a two-way direction in one embodiment between the cell based transceiver and the communication system.

Title
Satellite positioning system augmentation with wireless communication signals
Application Number
9/64673
Publication Number
5999124
Application Date
April 22, 1998
Publication Date
December 7, 1999
Inventor
Leonid Sheynblat
Belmont
CA, US
Agent
Blakely Sokoloff Taylor & Zafman
Assignee
SnapTrack
CA, US
IPC
H04B 7/185
G01S 5/02
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