Henry Stewart Cobb

US Patent:

6882314, Apr 19, 2005

Filed:

Jul 30, 2002

Appl. No.:

10/209782

Inventors:

Kurt R. Zimmerman - Mountain View CA, US
Clark E. Cohen - Washington DC, US
David G. Lawrence - Mountain View CA, US
Walter C. Melton - Columbia MO, US
Henry Stewart Cobb - Mountain View CA, US
Paul Yalden Montgomery - Menlo Park CA, US

Assignee:

Novariant, Inc. - Menlo Park CA

International Classification:

G01S003/02
G01S001/08

US Classification:

342464, 342386

Abstract:

Apparatus and methods for resolving integer ambiguities in position determination. An embodiment of the invention includes a reference system, augmented with multi-frequency pseudolites using a carrier phase differential GPS implementation, and a mobile system. In one embodiment, the components of the reference system includes one or more multi-frequency pseudolites, one or more multi-frequency reference receivers, a data link standing alone or built into the pseudolites, and the associated antennae for each of these elements. The components of the reference system may be stationary. The mobile system may include a multi-frequency receiver and its associated antennae. Because the mobile systems may passively receive information, an unlimited number of mobile systems may be included in any given embodiment of the invention. A multi-frequency pseudolite uses a single frequency source to synthesize all of the multiple carrier frequencies and all of the multiple base band signals modulated onto carrier frequencies for transmission.

US Patent:

7023381, Apr 4, 2006

Filed:

Mar 17, 2003

Appl. No.:

10/391161

Inventors:

Kurt R. Zimmerman - Mountain View CA, US
Clark E. Cohen - Palo Alto CA, US
David G. Lawrence - Mountain View CA, US
Walter C. Melton - Los Altos CA, US
Henry Stewart Cobb - Mountain View CA, US
Paul Yalden Montgomery - Menlo Park CA, US

Assignee:

Novariant, Inc. - Menlo Park CA

International Classification:

G01S 1/08
G01S 3/02

US Classification:

342386, 342464

Abstract:

Apparatus and methods for resolving integer ambiguities in position determination. An embodiment of the invention includes a reference system, augmented with multi-frequency pseudolites using a carrier phase differential GPS implementation, and a mobile system. In one embodiment, the components of the reference system includes one or more multi-frequency pseudolites, one or more multi-frequency reference receivers, a data link standing alone or built into the pseudolites, and the associated antennae for each of these elements. The components of the reference system may be stationary. The mobile system may include a multi-frequency receiver and its associated antennae. Because the mobile systems may passively receive information, an unlimited number of mobile systems may be included in any given embodiment of the invention. A multi-frequency pseudolite uses a single frequency source to synthesize all of the multiple carrier frequencies and all of the multiple base band signals modulated onto carrier frequencies for transmission.

US Patent:

7489270, Feb 10, 2009

Filed:

Apr 15, 2005

Appl. No.:

11/106962

Inventors:

David Gary Lawrence - Santa Clara CA, US
Kurt Zimmerman - Mountain View CA, US
Paul Yalden Montgomery - Menlo Park CA, US
Henry Stewart Cobb - Palo Alto CA, US

Assignee:

Novariant, Inc. - Fremont CA

International Classification:

G01S 1/00
G01C 21/00

US Classification:

34235706, 701215

Abstract:

A number of solutions for deriving the line bias are disclosed. Some of these solutions utilize signal processing and judicious selection of the frequency plan used in the position detection systems to either enable the derivation of the line bias, or make the measurements insensitive to line bias. In other examples, the present invention utilizes measurement schemes for deriving the line bias and enabling a position detection system to process line bias information in order to find a position solution.

US Patent:

RE372560, Jul 3, 2001

Filed:

Nov 5, 1998

Appl. No.:

9/187194

Inventors:

Clark E. Cohen - Palo Alto CA
Bradford W. Parkinson - Los Altos CA
John D. Powell - Menlo Park CA
David G. Lawrence - Mountain View CA
Boris S. Pervan - Mountain View CA
Henry S. Cobb - Stanford CA

Assignee:

IntegriNautics, Inc. - Menlo Park CA

International Classification:

G01S 510
G01S 168
G01S 502
G01S 108
H04B 7185

US Classification:

34235706

Abstract:

A GPS system and method for generating precise position determinations. The GPS system includes a ground based GPS reference system which receives with a reference receiver GPS signals and makes phase measurements for the carrier components of the GPS signals. The GPS reference system then generates and broadcasts an initialization signal having a carrier component and a data link signal having a data component. The data component of the data link signal contains data representing the phase measurements made by the reference receiver. The GPS system also includes a GPS mobile system which receives with a mobile position receiver the same GPS signals as were received by the reference system. In addition, the GPS position receiver receives the data link and initialization signals broadcast by the reference system. The GPS position receiver then makes phase measurements for the carrier components of the GPS signals during and after an initialization period and makes phase measurements for the initialization signal during the initialization period.

US Patent:

55722180, Nov 5, 1996

Filed:

Jun 7, 1995

Appl. No.:

8/480021

Inventors:

Clark E. Cohen - Palo Alto CA
Bradford W. Parkinson - Los Altos CA
John D. Powell - Menlo Park CA
David G. Lawrence - Mountain View CA
Boris S. Pervan - Mountain View CA
Henry S. Cobb - Stanford CA

Assignee:

IntegriNautics - Palo Alto CA

International Classification:

G01S 502
G01S 108
H04B 7185

US Classification:

342357

Abstract:

A GPS system and method for generating precise position determinations. The GPS system includes a ground based GPS reference system which receives with a reference receiver GPS signals and makes phase measurements for the carrier components of the GPS signals. The GPS reference system then generates and broadcasts an initialization signal having a carrier component and a data link signal having a data component. The data component of the data link signal contains data representing the phase measurements made by the reference receiver. The GPS system also includes a GPS mobile system which receives with a mobile position receiver the same GPS signals as were received by the reference system. In addition, the GPS position receiver receives the data link and initialization signals broadcast by the reference system. The GPS position receiver then makes phase measurements for the carrier components of the GPS signals during and after an initialization period and makes phase measurements for the initialization signal during the initialization period.