Relay attack determination device
US11702035B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 14, 2020 |
| Grant date | Jul 18, 2023 |
| Priority date | — |
| Expiry date | Oct 14, 2040 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B17/318
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A portable device includes a reception antenna and a strength meter. The reception antenna includes antennas of three axes each receiving a first signal and a second signal. The strength meter measures a reception strength of the request signal and the request signal received by each of the three axes of the LF receiver. A relay attack determination device is provided with a comparator that executes a comparative process of strength ratios of the request signal and the request signal based upon a measurement value of the reception strength. In a case where the three axes include an ineffective axis, in which the measurement value of the reception strength of the request signal or the request signal deviates from a usable range, the comparator excludes the ineffective axis and executes the comparative process.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.