Title:
GPS POSITION TRACKING METHOD WITH VARIABLE UPDATING RATE FOR POWER CONSERVATION
Document Type and Number:
WIPO Patent Application WO2006099632
Kind Code:
A3
Abstract:
A system and method in which the position update rate is adaptively modified, based on previous position measurements. By adjusting the update rate based on velocity predictions from two or more position fixes, a lower update rate may be used without exceeding the maximum error. Lowering the update rate reduces power consumption in the UE, providing longer battery operation. The updating method may comprise periodically repeating the velocity prediction and periodically adjusting the update rate responsive thereto. The update rate may be adjusted using additional information such as an acceleration prediction, a minimum update rate, or a preferred error. In some embodiments a model for user movement may be used to provide more accurate predictions, for example, stationary, walking, jogging, city driving, and freeway driving. The updating method may comprise receiving user input regarding the maximum position error.
Inventors:
PERSICO CHARLES J (US)
Application Number:
PCT/US2006/010082
Publication Date:
November 09, 2006
Filing Date:
March 17, 2006
Export Citation:
Assignee:
QUALCOMM INC (US)
PERSICO CHARLES J (US)
PERSICO CHARLES J (US)
International Classes:
G01S5/02; G01S19/27
Foreign References:
| US6559794B1 | 2003-05-06 | |||
| EP1132713A1 | 2001-09-12 | |||
| US6199045B1 | 2001-03-06 | |||
| EP1484619A2 | 2004-12-08 |
Other References:
PATENT ABSTRACTS OF JAPAN vol. 1998, no. 13 30 November 1998 (1998-11-30)
Download PDF: