Identification system for verifying an authorization to access an object or to use an object, particularly a motor vehicle
US7098769B2 · kind B2 · utility
18Cited by
5References
14Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 30, 2003 |
| Grant date | Aug 29, 2006 |
| Priority date | — |
| Expiry date | Oct 1, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG07C2209/63
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
An identification system is disclosed in which an interrogation signal is emitted on the side of the object, the signal having a carrier frequency which is modified in sections. A mobile encoder (20) encodes the interrogation signal and produces a response signal which is sent back to the object (10). The response signal is mixed with the interrogation signal and decoded in an evaluation unit (14–16) on the side of the object. The distance (d) between the encoder (20) and the object (10) is then determined by means of Fourier transformation (16).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.