Onboard system in a vehicle and central system for locating the vehicle accurately
US6735521B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 30, 2000 |
| Grant date | May 11, 2004 |
| Priority date | — |
| Expiry date | Mar 30, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M2215/0196
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An onboard system determines the position of a vehicle from radio signals from a constellation of navigation satellites and periodically transmits to a traffic control center the position thus determined, a time label supplied by the constellation of navigation satellites and the identity of the vehicle. A central system for accurately locating at least one vehicle provided with a system of the above kind calculates the position at the current time as a function of the position and the speed vector of the vehicle and the time label transmitted by the vehicle. These systems can determine a position periodically and with great accuracy because the time label supplied by the constellation of navigation satellites can be used to compensate fluctuations in the transmission time between the vehicle and the traffic control center when the position is received in the traffic control center.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.