Title:
REDUCED ACQUISITION TIME FOR GPS COLD AND WARM STARTS
Document Type and Number:
WIPO Patent Application WO2002077661
Kind Code:
A3
Abstract:
A system and method for reducing acquisition times in a GPS receiver (30) enables determination at start-up of the GPS receiver (30) of the occurrence of ephemeris data at the GPS receiver (30) being older than approximately two hours or a change in a mobile country code and mobile network code of a cellular device (10) associated with the GPS receiver (30). Data is obtained for the GPS receiver (30) from a reference server (20) responsive to occurrence of one of these conditions and the position of the GS receiver (30) is determined at a reduced acquisition time using the obtained data.
Inventors:
SANCHEZ YOLDI CESAR (ES)
MARTINEZ LEBENA ALBERTO J (ES)
MARTINEZ LEBENA ALBERTO J (ES)
Application Number:
PCT/EP2002/003170
Publication Date:
December 05, 2002
Filing Date:
March 19, 2002
Export Citation:
Assignee:
ERICSSON TELEFON AB L M (SE)
SANCHEZ YOLDI CESAR (ES)
MARTINEZ LEBENA ALBERTO J (ES)
SANCHEZ YOLDI CESAR (ES)
MARTINEZ LEBENA ALBERTO J (ES)
International Classes:
G01S1/00; (IPC1-7): G01S5/14
Domestic Patent References:
| WO2000019231A1 | 2000-04-06 | |||
| WO1998058505A1 | 1998-12-23 | |||
| WO1998016077A2 | 1998-04-16 | |||
| WO1999066342A1 | 1999-12-23 |
Foreign References:
| US5999125A | 1999-12-07 | |||
| US5365450A | 1994-11-15 |
Other References:
PATENT ABSTRACTS OF JAPAN vol. 1999, no. 08 30 June 1999 (1999-06-30)
PATENT ABSTRACTS OF JAPAN vol. 2000, no. 13 5 February 2001 (2001-02-05)
PATENT ABSTRACTS OF JAPAN vol. 2000, no. 13 5 February 2001 (2001-02-05)
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