Communications: directive radio wave systems and devices (e.g. – Directive – Including a satellite
Patent
1998-08-11
2000-10-17
Blum, Theodore M.
Communications: directive radio wave systems and devices (e.g.,
Directive
Including a satellite
34235709, 3423571, 34235712, 34235713, 701213, H04B 7185
Patent
active
061338745
ABSTRACT:
A method and an apparatus which acquire satellite positioning system (SPS) signals in an SPS receiver. Information on time of day, approximate receiver location, and satellite positions are used to reduce the time to search and acquire signals from one or more SPS satellites. In an example of a method of the invention, a first pseudorange to a first SPS satellite is determined, and an approximate location of the SPS receiver is determined. An estimated pseudorange for a second pseudorange to a second SPS satellite is determined from the approximate location and a satellite position of the second SPS satellite. The SPS receiver then searches for SPS signals from the second SPS satellite in a range determined by the estimated pseudorange. Typically, this method reduces the search time to initially acquire SPS signals from the second SPS satellite, and the estimated pseudorange is not based on a previously determined pseudorange for said second SPS satellite. In a particular example of the invention, the approximate location is determined from a cell based information source which correlates an identification of each of various wireless cell sites with an approximate location for objects within a cell of a wireless cell based communication system, such as a cellular (or cell based) telephone system. In other examples of the invention, relatively precise time of day information may be used with information indicating satellite positions and information indicating the approximate location to determine an estimated pseudorange for a first SPS satellite to be acquired.
REFERENCES:
patent: 4445118 (1984-04-01), Taylor et al.
patent: 4622557 (1986-11-01), Westerfield
patent: 5119102 (1992-06-01), Barnard
patent: 5365450 (1994-11-01), Schuchman et al.
patent: 5412388 (1995-05-01), Attwood
patent: 5418538 (1995-05-01), Lau
patent: 5459763 (1995-10-01), Hori et al.
patent: 5488378 (1996-01-01), Colley
patent: 5515062 (1996-05-01), Maine et al.
patent: 5663734 (1997-09-01), Krasner
patent: 5663735 (1997-09-01), Eshenbach
PCT International Search Report for PCT International Appln No. PCT/US99/16111 mailed Feb. 25, 2000 (12 pages total).
Blum Theodore M.
SnapTrack, Inc.
LandOfFree
Method and apparatus for acquiring satellite positioning system does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and apparatus for acquiring satellite positioning system , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for acquiring satellite positioning system will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-473579