Device and method for determining the speed of a wheeled terrestrial vehicle from measurements of an ambient terestrial magnetic field
US9513307B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 8, 2009 |
| Grant date | Dec 6, 2016 |
| Priority date | — |
| Expiry date | Nov 6, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01P3/481
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A device for measuring the speed of movement of a wheeled terrestrial vehicle. A magnetometer takes measurements of an ambient terrestrial magnetic field and is positioned so as to be sensitive to the magnetic field variations caused by the rotation of at least one partially metallic wheel of the vehicle. The magnetometer delivers a corresponding signal. The signal is processed to establish a frequency spectrum thereof. From the frequency spectrum, a frequency of rotation of the wheel is determined, and deducing therefrom, on the basis of information representative of the radius of the wheel, the speed of movement of the vehicle.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.