EFFICIENT SPECTRUM UTILIZATION FOR AUTOMATIC VEHICLE LOCATION SYSTEMS

ALTERNATIVE SYSTEMS FOR VEHICLE LOCATION AND COMMUNICATIONS WITH REFERENCE TO BANDWIDTH REQUIREMENTS ON THE ELECTROMAGNETIC SPECTRUM ARE COMPARED WITH REFERENCE TO URBAN TRANSIT BUS OPERATIONS, POLICE CARS, FIRE FIGHTING EQUIPMENT, AND AMBULANCE SERVICES. LOCATION AND COMMUNICATIONS SYSTEMS CAN BE DESIGNED TO TRANSMIT BOTH DIGITAL AND VOICE SIGNALS ON AN AUTOMATIC OR IRREGULAR BASIS. THE AUTOMATIC VEHICLE MONITORING CONFIGURATIONS EXAMINED ARE FIXED MEASUREMENT, TRILATERATION, PULSE TRILATERATION, PHASE TRILATERATION, TRIANGULATION, PROXIMITY OR SIGNPOST, INVERSE PROXIMITY, FIELD STRENGTH, MOBILE MEASUREMENT, DEAD RECKONING, AND LORAN. ALTERNATIVE POLLING METHODS ARE ALSO DISCUSSED. LORAN, PROXIMITY, AND PHASE TRILATERATION SYSTEMS OFFER EFFICIENT SPECTRUM UTILIZATION AND SUBSTANTIAL BANDWIDTH SAVINGS. SEQUENTIAL POLLING, IN WHICH EACH VEHICLE OR STATION IS INTERROGATED IN A SPECIFIED ORDER, WAS FOUND TO REQUIRE GREATER BIT RATES BUT OFFER SIGNIFICANT FLEXIBILITY. /UMTA/

• Supplemental Notes:
  • PROJ NO MD-MTD-4
• Corporate Authors:

  IIT Research Institute

  10 West 35th Street
  Chicago, IL  United States  60616
• Authors:
  • Scales, W C
  • Barmby, J G
• Publication Date: 1971-4

Subject/Index Terms

• TRT Terms: Automatic vehicle monitoring; Bandwidth; Buses; Communication systems; Digital computers; Electromagnetic spectrum; Emergency vehicles; Frequency allocation; Location; Motor vehicles; Speech; Triangulation; Voice communication
• Old TRIS Terms: Digital systems; Polling; Spectrum management; Trilateration
• Subject Areas: Highways; Operations and Traffic Management; Public Transportation;

Filing Info

• Accession Number: 00226477
• Record Type: Publication
• Source Agency: Urban Mass Transportation Administration
• Files: TRIS, USDOT
• Created Date: Oct 15 1972 12:00AM