Methods and apparatuses of positioning a mobile user in a system of satellite differential navigation
US6456233B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 5, 2001 |
| Grant date | Sep 24, 2002 |
| Priority date | — |
| Expiry date | Jun 5, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S19/44
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The measurements of two GPS and/or GLONASS receivers are related to a common time moment by extrapolating measurement data that has arrived through a connection link with a delay. This common time moment is defined by the user. Cycle slips in the phase-lock loops (PLLs) of the receivers, which may be caused by blockage of direct signals from the satellites, strong interference signals, and reflections, are deflected and corrected in a multi-loop nonlinear tracking system. The procedure of resolution of phase measurement ambiguities comprises the preliminary estimation of floating ambiguities by a recurrent (e.g., iterative) procedure including the simultaneous processing of code and phase measurements for all satellites for each processing time interval, and the gradual improvement of the result as the information is accumulated. After the resolution of ambiguity, the user coordinates are estimated with centimeter accuracy on the basis of phase measurements on the carrier frequency.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.