Method for improving clock accuracy in a wide area positioning pseudolite receiver system architecture
US9507010B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 20, 2013 |
| Grant date | Nov 29, 2016 |
| Priority date | — |
| Expiry date | Dec 5, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S19/11
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method, apparatus and computer-readable medium for determining a frequency drift of clock of a mobile communication device is disclosed. A first positioning signal, such as M-LMS signals, is received at a first positioning engine of the mobile communication device controlled by the clock. A second positioning signal, such as GNSS signals, is received at a second positioning engine of the mobile communication device controlled by the clock. A first position is determined from the first positioning signal, and a second position is determined from the second positioning signal. A difference between the first position and the second position is determined, and the frequency drift of the clock is determined from the difference between the first position and the second position. The frequency drift determined may be subsequently applied to the clock, and thus enhance the accuracy of M-LMS positioning when GNSS signals are unreliable.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.