VEHICLE TRACKING SYSTEM FOR HEADWAY MONITORING
The patent application concerns a vehicle tracking system comprising a plurality of antenna loops buried under a roadway. The loops are divided into groups and are excited by small transmitters in the vehicles being monitored. Associated with each group of loops is a receiving detector. Also associated with each group is a scanner that causes a switch to individually and sequentially connect the loops to the detector. When the detector produces an output, indicating that a vehicle is near the loop being sampled, an inhibit device stops the scanner thus locking the loop that is excited to the detector. A binary number identifying the loop that is excited is placed in an address register and is coupled by a buss to a central control unit. Thus, the location of vehicles is found by reading the addresses on the buss.
- Government-owned invention available for licensing. Copy of application available NTIS.
Department of Transportation1200 New Jersey Avenue, SE
Washington, DC United States 20590
- Evans, R R
- Publication Date: 1973-11-1
- Pagination: 10 p.
- TRT Terms: Antennas; Detectors; Highway traffic control; Monitoring; Patent applications; Traffic engineering; Vehicle detectors
- Uncontrolled Terms: Monitors
- Old TRIS Terms: Gpdot; Loop antennas
- Subject Areas: Operations and Traffic Management;
- Accession Number: 00051669
- Record Type: Publication
- Source Agency: National Technical Information Service
- Report/Paper Numbers: PAT-APPL-411 671 Patent Apl
- Files: NTIS, USDOT
- Created Date: Mar 25 1974 12:00AM