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.

  • Supplemental Notes:
    • Government-owned invention available for licensing. Copy of application available NTIS.
  • Corporate Authors:

    Department of Transportation

    1200 New Jersey Avenue, SE
    Washington, DC  United States  20590
  • Authors:
    • Evans, R R
  • Publication Date: 1973-11-1

Media Info

  • Pagination: 10 p.

Subject/Index Terms

Filing Info

  • 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