Method, system and device for position determination with predicted ephemeris
US9739888B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 27, 2014 |
| Grant date | Aug 22, 2017 |
| Priority date | — |
| Expiry date | Aug 26, 2035 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S19/258
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Method, system, and device are provided for position determination with the use of predicted ephemeris to reduce the time-to-first-fix. The method includes: in a device, receiving broadcast orbit data and clock states from a plurality of satellites to determine first assistance data for the plurality of satellites, and numerically predicting first ephemeris for the plurality of satellites using the first assistance data. The method also includes: in a server system, receiving precise orbit data and accurate satellite clock states from a global GNSS service network to determine second assistance data; in a device, receiving the second assistance data and numerically predicting second ephemeris using the second assistance data. The method further includes: in a device, receiving satellite signals from a plurality of satellites, checking the period of validity of the first predicted ephemeris and the second predicted ephemeris respectively to select a predicted ephemeris from both the first predicted ephemeris and the second predicted ephemeris.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.