NCJ Number
12629
Date Published
1972
Length
346 pages
Annotation
RESULTS OF A PROGRAM TO EVALUATE, TEST, AND DEMONSTRATE AN AUTOMATIC VEHICLE MONITORING (AVM) SYSTEM BASED ON LORAN C (LONG-RANGE RADIO NAVIGATION).
Abstract
RESEARCH HAS BEEN CONDUCTED TO DEVELOP AND TEST ALTERNATIVE REAL-TIME AVM SYSTEMS. THIS REPORT DESCRIBES THE TELEDYNE SYSTEMS COMPANY AVM DESIGN WHICH LOCATES VEHICLES BY A LORAN C METHOD. THE REPORT DESCRIBES BASELINE SYSTEM CONFIGURATION, SYSTEM DESIGN, SYSTEMS COSTS, SYSTEM VARIATIONS, DEMONSTRATION EQUIPMENT, AND EXPERIMENTAL RESULTS. THIS AVM APPLICATION WAS DEVELOPED TO FACILITATE THE LOCATION OF FLEET VEHICLES IN AN URBAN SITUATION, SUCH AS TRANSIT BUSES. LORAN C SYSTEMS EMPLOY LONG-RANGE RADIO NAVIGATION TRANSMISSIONS AVAILABLE FROM A RELATIVELY SMALL NUMBER OF TRANSMITTER REFERENCE SITES. ANY GIVEN VEHICLE DERIVES DATA REPRESENTATIVE OF ITS POSITION WITH RESPECT TO THREE OF THE REFERENCE TRANSMITTERS, AND RELAYS THIS INFORMATION TO A CENTRAL LOCATION. THE LOCATION OF THE VEHICLE IS THEN COMPUTED. THE REPORT PRESENTS RESULTS OF A GROUNDWAVE EXPERIMENT TO MEASURE THE EXISTING EAST COAST LORAN C COVERAGE AND AN URBAN ENVIRONMENT EXPERIMENT IN WHICH THE PERFORMANCE OF THE LORAN C AVM SYSTEM WAS EVALUATED IN DOWNTOWN PHILADELPHIA. (AUTHOR ABSTRACT)