Jock R Christie

US Patent:

6704650, Mar 9, 2004

Filed:

May 31, 2001

Appl. No.:

09/872767

Inventors:

Richard A. Fuller - Los Gatos CA
Roger Hayward - San Francisco CA
Jock Christie - Mountain View CA

Assignee:

SkyNetix, LLC - Long Beach CA

International Classification:

G01C 2100

US Classification:

701213, 701214, 701208, 34235701, 34235709

Abstract:

A method of determining the distance traveled during an event by a mobile GPS receiver. The event comprises epochs. The method comprises receiving pseudorange data comprised of one of pseudorange differences or range rates. Each pseudorange difference, in turn, comprises a difference between a first pseudorange and a second pseudorange. The first pseudorange comprises the pseudorange between the receiver and a GPS satellite at a first epoch. The second pseudorange comprises the pseudorange between the receiver and the GPS satellite at a second epoch. The range rates comprise a range rate measurement taken by the receiver of the GPS satellite from the first epoch to the second epoch. Line-of-sight data comprised of at least one normalized vector between the receiver and the GPS satellite is then determined. Based on the pseudorange and line-of-sight data, incremental distance data is then determined. A sum over the event of the incremental distance data is then determined.

US Patent:

6531981, Mar 11, 2003

Filed:

Apr 30, 2001

Appl. No.:

09/845753

Inventors:

Richard A. Fuller - Los Gatos CA
Roger Hayward - San Francisco CA
Jock Christie - San Anselmo CA

Assignee:

SkyNetix, LLC - Fountain Valley CA

International Classification:

G01S 514

US Classification:

34235703, 701215

Abstract:

A system and method is disclosed for corresponding data associated with primary correction of at least one first measurement of a GPS satellite characteristic to a second measurement of the GPS satellite characteristic taken at a mobile receiver. In a preferred embodiment of the invention, a first processor is coupled to at least one wide-area GPS corrections receiver and at least one local-area GPS corrections receiver. The wide-area and local-area receivers operate to determine the first measurement and secondary data associated with correction of the determined first measurement. In operation, an estimate of the location of the mobile receiver is determined by the first processor. The availability to the mobile receiver of the secondary correction data from the wide-area and local-area GPS corrections receivers is determined, preferably based on the location estimate. From the secondary correction data, primary data representing the primary correction is determined by the first processor. The primary data and the second measurement data are preferably colocated by causing the first processor to transmit the primary correction data to the mobile receiver.