Automatic vehicle identification system capable of vehicle lane discrimination
US6064320A · kind A · utility
133Cited by
6References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 3, 1998 |
| Grant date | May 16, 2000 |
| Priority date | — |
| Expiry date | Apr 3, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S13/765
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A system of vehicle identification with a first interrogator that uses a Lower SideBand (LSB) receiver to receive a modulated signal from a vehicle transponder and a second interrogator that uses an Upper SideBand (USB) receiver to receive another modulated signal. The two interrogators are adjacent to each other at a toll plaza, and operate at different carrier frequencies to force a signal frequency bandgap between communication signals in adjacent vehicle lanes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.