Patent Number: 6,670,916

Title: Method and system for position calculation from calculated time

Abstract: A navigation-satellite receiver comprises means for initialization that gets a head start by knowing time to within a few seconds and position to within 150 kilometers. A two-dimensional grid of points is setup with constant altitude that represents solution starting points within the 150 kilometer area. Fractional pseudoranges from each satellite in a constellation are inspected for a best initial fit with the points in the grid. A variety of time bias adjustments within the time bounds are also tried against the points to find a best fitting point. That point then is used in a drive to find the final solution and to produce the first fix from cold start.

Inventors: Edwards; Stephen J. (San Francisco, CA), McBurney; Paul W. (San Francisco, CA)

Assignee: Seiko Epson Corporation

International Classification: G01S 1/00 (20060101); G01S 5/14 (20060101); G01S 005/14 ()

Expiration Date: 12/30/2020