Method for a space-efficient GPS receiver
US7355551B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 6, 2006 |
| Grant date | Apr 8, 2008 |
| Priority date | — |
| Expiry date | Mar 6, 2026 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S19/27
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
In a Global Positioning System (GPS) receiver, rather than storing both GPS satellite ephemeredes and almanacs to the GPS receiver's on-chip non-volatile memory, storing into the non-volatile memory only the more recent ephemeris or almanac data for each satellite. When an ephemeris expires, the parameters in the ephemeris are converted into corresponding parameters of an almanac. The ephemeris or almanac is used to determine whether a given satellite is visible to the GPS receiver. A method of the present invention allows efficient use of the memory space in the non-volatile memory. A study by the inventors shows that differences in positions and velocities of satellites estimated using aged ephemeris and almanac data associated with the same week number are insignificant.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.