Rapid satellite signal acquisition in a satellite positioning sy

Communications: directive radio wave systems and devices (e.g. – Directive – Including a satellite

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

342358, 371 1, G01S 502, H04B 1500

Patent

active

054185386

ABSTRACT:
A method for fast acquisition of Satellite Positioning System (SATPS) signals from a satellite-based positioning system, such as GPS or GLONASS, that does not require permanent storage of satellite almanac information at an SATPS ground station. This SATPS signal acquisition method can be used whenever the "new" station initially powers up or has lost lock on one or more SATPS signals that must be reacquired. A nearby reference SATPS station, whose location coordinates are known with high accuracy, provides the new SATPS station with differential positioning SATPS information, and, optionally, with SATPS satellite ephemeride information on each SATPS satellite visible from the reference station. The new station then uses this differential SATPS information to establish channels to search for (only) the SATPS satellites that are visible from the reference station. By limiting the search to the frequency range and code-phase attributes, such as the distinctive pseudo-random noise code used by each SATPS satellite, corresponding to these visible SATPS satellites, the ranges to be searched are decreased. When a first SATPS satellite signal is acquired and locked onto by the new station, the frequency range for searching is narrowed to a range corresponding to the Doppler shift frequency range for the visible satellites, and acquisition of additional SATPS satellite signals proceeds quickly. This system also allows the use of less accurate timing sources for the new stations. A new station need not store the ephemeride information for the SATPS satellites but may call upon and use the ephemeride information stored at the reference station.

REFERENCES:
patent: 4384293 (1983-05-01), Deem et al.
patent: 4463357 (1984-07-01), Mac Doran
patent: 4701934 (1987-10-01), Jasper
patent: 4751512 (1988-06-01), Longaker
patent: 4968981 (1990-11-01), Sekine et al.
patent: 5021792 (1991-06-01), Hwang
patent: 5036329 (1991-07-01), Ando
patent: 5059969 (1991-10-01), Sakaguchi et al.
patent: 5061936 (1991-10-01), Suzuki
patent: 5101356 (1992-03-01), Timothy et al.
patent: 5119102 (1992-06-01), Barnard
patent: 5119504 (1992-06-01), Durboraw
patent: 5146231 (1992-09-01), Ghaem et al.
patent: 5155491 (1992-10-01), Ando
patent: 5185761 (1993-02-01), Kawasaki
patent: 5225842 (1993-07-01), Brown et al.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Rapid satellite signal acquisition in a satellite positioning sy does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Rapid satellite signal acquisition in a satellite positioning sy, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Rapid satellite signal acquisition in a satellite positioning sy will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-2143051

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.