Railway positioning method and system
US10859711B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 2, 2016 |
| Grant date | Dec 8, 2020 |
| Priority date | — |
| Expiry date | Sep 26, 2037 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S19/50
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A railway positioning method, based on the movement of a train determined by a signal receiver of a satellite navigation system embedded onboard the train, and on the movement of the train determined by an odometer embedded onboard the train, and a map of the railway tracks, by determination of the ionospheric propagation bias corresponding to a propagation bias of the signal carrier phase of the satellite navigation system, comprises the steps of, by line of sight of the satellites of the navigation system: estimating the biased ionospheric drift by difference between an integrated Doppler term determined by the receiver and a biased estimation of the movement of the train by the odometer; estimating the odometer drift bias and the drift bias of the local clock of the receiver, by least squares resolution of the speed determined by the satellite navigation system, of the drift bias of the local clock of the receiver, and of the odometer drift bias; correcting the estimation of the ionospheric drift, by subtraction of the estimated odometer drift bias; and correcting the integrated Doppler term using the drift bias of the local clock of the receiver and the ionospheric drift bias, …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.