Fast acquisition of GPS signal
US6778136B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 13, 2001 |
| Grant date | Aug 17, 2004 |
| Priority date | — |
| Expiry date | Feb 12, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S19/42
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Upon reception of four GPS signals from GPS satellites and determining four pseudo ranges, along with ephemeris data previously stored in the GPS receiver, the location of the GPS receiver and real time clock time error is determined. The GPS receiver is in possession of four pseudo ranges and determines four unknown coordinate values (x, y, x, and time) identifying the location of the GPS receiver and real time clock error. The process of solving for four pseudo range formulas simultaneously with each pseudo range formula having an unknown “x”, “y” “z”, and time coordinates of the GPS receiver, results in identification of the coordinates and time of the GPS receiver. In a similar process, the GPS receiver receiving four GPS signals from four GPS satellites is able to determine four pseudo ranges. Using the four pseudo ranges, four pseudo range equations unknown values for “x”, “y”, “z” and time can be solved for simultaneously. The resulting values are then used to verify that the calculated positions of the GPS satellites are within 0.5 ms of the previous solution. If the GPS satellites are within 0.5 ms ran…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.