Emergency vehicle command and control system for traffic signal preemption
US5955968A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 16, 1997 |
| Grant date | Sep 21, 1999 |
| Priority date | — |
| Expiry date | Jan 16, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08G1/087
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
The present invention provides an emergency vehicle command and control system for preemption of intersection traffic signals. Specifically, the system employs coded microwave transmissions from the emergency vehicle which are received by a scanned antenna array at the intersection and are processed to determine the direction-of-arrival of the signal. Each coded transmission received at the intersection is demodulated and error checked for validity. Valid transmissions are communicated to an intersection controller to preempt traffic signals. The system is also equipped to handle multiple vehicle arrivals and to transmit a coded signal to adjacent or orthogonal intersections to execute around-the-corner preemption control. Additionally, all preemption events may be stored in a memory for later retrieval and analysis.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.