NCJ Number
11233
Date Published
1971
Length
81 pages
Annotation
OVERVIEW OF THE STATE-OF-THE-ART ON AUTOMATIC VEHICLE MONITORING (AVM) TECHNOLOGY, AND THE ADVANTAGES AND DISADVANTAGES OF VARIOUS SYSTEM TECHNIQUES.
Abstract
THE PURPOSE OF AN AUTOMATIC VEHICLE MONITORING (AVM) SYSTEM IS TO PROVIDE THE MEANS FOR KNOWING THE LOCATION OF EACH OF THE VEHICLES IN A LARGE FLEET AND AT THE SAME TIME PROVIDE A TWO-WAY VOICE AND DIGITAL COMMUNICATION CAPABILITY, THE LATTER TO INCLUDE A SILENT ALARM. THIS REPORT SUMMARIZES THE STATE-OF-THE-ART AND EXPECTED PERFORMANCE FOR SYSTEMS AS DERIVED FROM INDUSTRY PROPOSALS FOR AVM TECHNOLOGY DEVELOPMENT IN RESPONSE TO A REQUEST OF THE DEPARTMENT OF TRANSPORTATION. THE SALIENT ADVANTAGES, DISADVANTAGES, AND CLAIMED ACCURACIES FOR THE GENERIC TYPES OF TECHNOLOGY ARE DISCUSSED, WITH THE AID OF NUMEROUS CHARTS AND TABLES. THE TYPES OF AVM SYSTEMS COVERED INCLUDE - DEAD RECKONING, PHASE TRILATERATION, LORAN, PROXIMITY, INVERTED PROXIMITY, PULSE TRILATERATION, AND TRIANGULATION. IT WAS NOT OBVIOUS WHICH OF THE TECHNIQUES WOULD PROVIDE THE BEST PERFORMANCE AND WHAT THE RELATIVE COSTS WOULD BE. THE PURPOSE OF THE TECHNOLOGY DEVELOPMENT PROGRAMS WAS TO CHOOSE SEVERAL OF THE MORE PROMISING TECHNOLOGIES AND TO FUND AN URBAN EXPERIMENT AND PROPER SYSTEM DESIGN. FOUR TECHNOLOGIES WERE CHOSEN FOR EVALUATION - A LORAN C SYSTEM, A PHASE RANGING SYSTEM CONSTRAINED TO A CONVENTIONAL MOBILE CHANNEL AND UTILIZING MULTIPLE RECEIVING SITES, A PHASE RANGING SYSTEM USING A WIDE DEVIATION SIGNAL AND FEWER RECEIVING SITES, AND AN X-BAND PROXIMITY SYSTEM. (SNI ABSTRACT)