Identification system for confirming authorization for access to an object or the use of an object, in particular of a motor vehicle
US6873248B2 · kind B2 · utility
5Cited by
13References
19Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 15, 2002 |
| Grant date | Mar 29, 2005 |
| Priority date | — |
| Expiry date | Oct 15, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG07C2009/00793
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
An identification system in which a trigger signal, emitted on an object side and received by a portable code generator, is provided. The trigger signal is used on the object side to phase code a reference signal. The code generator encodes a response signal using the trigger signal in a phase-coded manner and retransmits the response signal. The received response signal is compared with the generated reference signal in an object-side evaluation unit using an autocorrelation function. If the value of the autocorrelation function is larger than a threshold value, an enabling signal is generated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.