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George J Geier, Ardalan Heshmati, Kelly G Johnson, Patricia W McLain: Position and velocity estimation system for adaptive weighting of GPS and dead-reckoning information. Trimble Navigation, Thomas E Schatzel, May 16, 1995: US05416712 (337 worldwide citation)

An embodiment of the present invention is a combined GPS and dead-reckoning (DR) navigation sensor for a vehicle in which a pair of modifications are made to an otherwise conventional Kalman filter. Process noise is adapted to cope with scale factor errors associated with odometer and turning rate s ...


2
George J Geier: Exploration system and method for high-accuracy and high-confidence level relative position and velocity determinations. Trimble Navigation, Thomas E Schatzel, April 13, 1993: US05202829 (267 worldwide citation)

An embodiment of the present invention is a shipboard GPS positioning system having data links to outlying tailbuoys equipped with respective GPS receivers. On ship, an Intel 386-based microcomputer system collects data from various ship's equipment including the ship's GPS receiver and data from th ...


3
Yilin Zhao, Thomas M King, George J Geier: Satellite positioning system receivers and methods therefor. Motorola, Roland K Bowler II, June 29, 2004: US06756938 (136 worldwide citation)

Methods for determining the location of a satellite positioning system receiver by determining an estimated location of the receiver (


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Thomas M King, George J Geier, Yilin Zhao: Method and apparatus for assisted GPS integrity maintenance. Motorola, Daniel R Collopy, Roland K Bowler II, Randall S Vass, August 6, 2002: US06429808 (132 worldwide citation)

A cellular network protocol which maintains the reliability of assisted GPS based positioning is taught. An Integrity Monitor (IM) informs mobile stations, their users, or networks of measurement quality and it warns them of failing and failed GPS satellites by isolating them from the effects of the ...


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George J Geier, Russell S Figor, Troy L Strother: Position and heading error-correction method and apparatus for vehicle navigation systems. Motorola, John J King, Thomas V Miller, June 10, 2003: US06577952 (132 worldwide citation)

The present invention solves the problems of the prior art by providing methods for compensating for temperature-dependent drift of bias in a vehicle heading sensor of a dead reckoning vehicle positioning system. Specifically, the invention uses a Kalman filter to generate a calibration curve for th ...


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George J Geier, William P Declerck, Thomas M King, James Edward Stephen: Aiding location determinations in satellite positioning system receivers. Motorola, Roland K Bowler II, January 4, 2005: US06839020 (128 worldwide citation)

A method for locating a satellite positioning system receiver, for example, a satellite positioning system enabled wireless communications device in cellular network, including obtaining a coarse position and/or a time estimate (210), and computing a satellite positioning system based position and/o ...


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Thomas M King, George J Geier: Method and mobile station for determining a code phase. Motorola, Marshall Gerstein & Borun, May 3, 2005: US06888497 (128 worldwide citation)

A method (500) and a mobile station (160) for determining a code phase are described herein. The mobile station (160) may generate a first auto correlation function (ACF) associated with correlation samples over a range of code phases corresponding to a line-of-sight signal. The mobile station (160) ...


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Thomas M King, George J Geier, Yilin Zhao, Roger C Hart: Method and apparatus for assisted GPS protocol. Motorola, Daniel R Collopy, Michael C Soldner, November 6, 2001: US06313787 (95 worldwide citation)

A cellular network protocol which minimizes the required data flow between the cellular infrastructure and each mobile handset supporting a GPS based positioning capability is taught. Four specific innovations are introduced which together minimize the number of bits required to be transferred to ea ...


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