Method of improving satellite reacquisition performance for integrated GP/IG navigational systems
US6640189B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 19, 2001 |
| Grant date | Oct 28, 2003 |
| Priority date | — |
| Expiry date | Sep 19, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S19/49
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method of reacquiring a satellite signal within an integrated GP/IG navigation system includes detecting a loss of synchronization between a timing code in the satellite signal and a corresponding reference timing code. The method includes receiving position data from an inertial guidance unit. The position data is representative of an estimated position (and its associated uncertainty) of the navigation system. The method also includes estimating a distance from the navigation system to the satellite, as a function of the position data, and deriving an initial delay from the distance. The method includes delaying the reference timing code, with respect to the timing code embedded in the satellite signal, by an offset delay substantially equal to the initial delay. The method includes incrementally varying the offset delay until the timing code embedded in the satellite signal is synchronized with the reference timing code, or until the offset delay equals a predetermined end limit value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.