David A Bird

US Patent:

7020555, Mar 28, 2006

Filed:

Dec 23, 2003

Appl. No.:

10/744925

Inventors:

James M. Janky - Los Altos CA, US
David G. Bird - Thornton CO, US
Ann Ciganer - San Mateo CA, US

Assignee:

Trimble Navigation Limited - Sunnyvale CA

International Classification:

H04B 7/185
G01S 5/02
G01C 21/00

US Classification:

701213, 701214, 342358, 34235712

Abstract:

A GPS information service system for providing supplemental GPS correction and signal acquisition information to subscribers. A GPS information server broadcasts GPS aiding information encrypted with subscription keys. A remote GPS subscription unit receives the key enablers for the subscription keys in service activation (SAM) messages for the services for which they have subscribed and then uses the subscription keys to decrypt the GPS aiding information. In order to prevent unauthorized access to the information, unsymmetrical signature generation and authentication algorithms are used for generating and authenticating signatures for the SAM messages.

US Patent:

7079075, Jul 18, 2006

Filed:

Jun 7, 2005

Appl. No.:

11/146757

Inventors:

Dennis Connor - San Jose CA, US
David G. Bird - Thornton CO, US

Assignee:

Trimble Navigation Limited - Sunnyvale CA

International Classification:

G01S 1/00

US Classification:

34235706, 34235703

Abstract:

A positioning system or synthetic phase processor or rover station for providing high integrity positions with graduated accuracies. The positioning system includes one or more real time kinematic (RTK) reference stations for receiving GPS signals at established reference positions and measuring reference phases. The positioning system or the rover station selects a synthetic offset vector and uses the synthetic offset vector for inferring synthetic reference phases to a synthetic position. The rover station uses the synthetic reference phases with actual or virtual reference positions for determining a rover position having an added positional error controlled by the synthetic offset vector. For another embodiment a secure rover station dithers a secure position with a synthetic offset vector for providing an unsecure rover position having the added positional error.

US Patent:

7089113, Aug 8, 2006

Filed:

Jan 9, 2006

Appl. No.:

11/328364

Inventors:

James M. Janky - Los Altos CA, US
David G. Bird - Thornton CO, US
Ann Ciganer - San Mateo CA, US

Assignee:

Trimble Navigation Limited - Sunnyvale CA

International Classification:

H04B 7/00
G01S 5/02
G01C 21/00

US Classification:

701213, 701214, 701215, 34235703, 34235712

Abstract:

A GPS information service system for providing supplemental GPS location correction and signal acquisition information to subscribers. A GPS information server broadcasts GPS information encrypted with subscription keys. Remote GPS subscription unit receive the key enablers for the subscription keys in service activation (SAM) messages for the services for which they have subscribed and then use the subscription keys to decrypt the GPS information. In order to prevent unauthorized use, the SAM messages have signatures derived from identifications of the remote GPS subscription units using an unsymmetrical signature algorithm.

US Patent:

7158885, Jan 2, 2007

Filed:

May 19, 2006

Appl. No.:

11/437467

Inventors:

James M. Janky - Los Altos CA, US
David G. Bird - Thornton CO, US
Ann Ciganer - San Mateo CA, US

Assignee:

Trimble Navigation Limited - Sunnyvale CA

International Classification:

G01S 5/02
H04B 7/00
G01C 21/00

US Classification:

701213

Abstract:

A GPS information service system for providing supplemental GPS correction and signal acquisition information to subscribers. A GPS information server broadcasts GPS aiding information encrypted with subscription keys. A remote GPS subscription unit receives the key enablers for the subscription keys in service activation (SAM) messages for the services for which they have subscribed and then uses the subscription keys to decrypt the GPS aiding information. In order to prevent unauthorized access to the information, unsymmetrical signature generation and authentication algorithms are used for generating and authenticating signatures for the SAM messages.

US Patent:

7336225, Feb 26, 2008

Filed:

May 23, 2006

Appl. No.:

11/439001

Inventors:

Dennis Connor - San Jose CA, US
David G. Bird - Thornton CO, US

Assignee:

Trimble Navigation Limited - Sunnyvale CA

International Classification:

G01S 1/00

US Classification:

34235706, 34335702, 34335703

Abstract:

A positioning system or synthetic phase processor or rover station for providing high integrity positions with graduated accuracies. The positioning system includes one or more real time kinematic (RTK) reference stations for receiving GPS signals at established reference positions and measuring reference phases. The positioning system or the rover station selects a synthetic offset vector and uses the synthetic offset vector for inferring synthetic reference phases to a synthetic position. The rover station uses the synthetic reference phases with actual or virtual reference positions for determining a rover position having an added positional error controlled by the synthetic offset vector. For another embodiment a secure rover station dithers a secure position with a synthetic offset vector for providing an unsecure rover position having the added positional error.

US Patent:

7580794, Aug 25, 2009

Filed:

Jun 26, 2006

Appl. No.:

11/474691

Inventors:

James M. Janky - Los Altos CA, US
David G. Bird - Thornton CO, US
Ann Ciganer - San Mateo CA, US

Assignee:

Trimble Navigation Limited - Sunnyvale CA

International Classification:

G10K 15/02
G06F 19/00

US Classification:

701213, 701214, 34235712, 380277

Abstract:

A GPS information service system for providing supplemental GPS correction and signal acquisition information to subscribers. A GPS information server broadcasts GPS aiding information encrypted with subscription keys. A remote GPS subscription unit receives the key enablers for the subscription keys in service activation (SAM) messages for the services for which they have subscribed and then uses the subscription keys to decrypt the GPS aiding information. In order to prevent unauthorized access to the information, unsymmetrical signature generation and authentication algorithms are used for generating and authenticating signatures for the SAM messages.

US Patent:

57775800, Jul 7, 1998

Filed:

Mar 1, 1995

Appl. No.:

8/396977

Inventors:

James M. Janky - Los Altos CA
David G. Bird - Sunnyvale CA

Assignee:

Trimble Navigation Limited - Sunnyvale CA

International Classification:

G01S 302

US Classification:

342457

Abstract:

Method and apparatus for determining vehicle present location using a location determination system (LDS), such as GPS, GLONASS, Loran or an inertial navigation system, that receives LDS signals from two or more sources. An LDS signal antenna and receiver/processor, an interrogation signal (IS) receiver means and IS responder means are electrically connected and carried on the vehicle. When a vehicle trigger event occurs, a specified vehicle IS is broadcast and is received by the IS receiver means. The IS receiver means causes the LDS receiver/processor to obtain vehicle present location information and to provide such information for the IS responder means, for transmission to an IS contact receiver (selected based upon vehicle present location). The IS receiver means and IS responder means are independently selected to be a cellular phone receiver, a paging signal receiver, a WAN/LAN workstation, or an Earth-satellite-Earth radiowave link, such as ORBCOMM. SM. Optionally, the LDS receiver/processor is kept in a "sleeper" mode, to conserve power until the IS receiver receives and responds to the specified IS, or is periodically activated to update the LDS antenna present location.

US Patent:

54185378, May 23, 1995

Filed:

Nov 18, 1992

Appl. No.:

7/978272

Inventors:

David G. Bird - Sunnyvale CA

Assignee:

Trimble Navigation, Ltd. - Sunnyvale CA

International Classification:

H04B 7185
G01S 502

US Classification:

342357

Abstract:

Method and apparatus for determining the present location of a missing vehicle, such as an automobile or marine vessel, using a Global Positioning System that receives GPS signals from two or more GPS satellites. A GPS antenna, GPS signal receiver/processor, a paging responder, a cellular telephone and associated antenna, and a controller/modem are installed in a vehicle and electrically connected together. When the vehicle is determined to be missing, because the vehicle has been misplaced, lost or stolen, the vehicle owner or operator contacts a vehicle location service center, which broadcasts a paging request that is received by the paging responder on the vehicle. The paging responder causes the controller/modem to interrogate the GPS receiver/processor to determine the present location of the vehicle. The receiver/processor determines the present vehicle location and notifies the controller/modem of such location. The controller/modem then causes the cellular telephone to notify the vehicle location service center of the present location of the missing vehicle so that the vehicle can be recovered.