Method and system for position calculation from calculated time
US6670916B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Feb 19, 2002 |
| Grant date | Dec 30, 2003 |
| Priority date | — |
| Expiry date | May 26, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S19/42
- WIPO fieldMeasurement
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.