Device for position determination by means of radio waves
US6975263B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | May 31, 1999 |
| Grant date | Dec 13, 2005 |
| Priority date | — |
| Expiry date | May 31, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01Q21/065
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A device for determining the position of a vehicle on a roadway by using radio waves which are emitted from the device and reflected by the vehicle and received by at least two array antennas (1, 2) arranged across the roadway, wherein the array antennas (1, 2) comprise a number of antenna elements (5–14), one of the antenna elements in the respective array antenna constituting the phase center (5, 10) of the array antennas, and wherein the antenna elements (5–14) of the array antennas are connected to one another such that the distance (d) between the phase centers (5, 10) of the array antennas (1, 2) included is smaller than half the width of an individual array antenna (1, 2).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.