United States Department of Transportation
i
Field Testing of a Pulse Trilateration Automatic Vehicle Monitoring System in Philadelphia: Volume I. Executive Summary
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1978-08-01
[PDF-1.55 MB]
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Abstract:Automatic Vehicle Monitoring (AVM) is an important part of an overall command and control system for vehicle fleet management as it automatically provides the system operator and/or dispatcher with timely information on the location and status of all vehicles to be controlled. This report describes the Pulse Trilateration AVM system developed by Hazeltine Corporation, and presents results of the Phase I test program in Philadelphia. This study is part of the U.S. Department of Transportation's multi-phase program to develop advanced AVM for multi-user applications. Volume I is an Executive Summary of the Philadelphia Phase I test results. During Phase I, Hazeltine implemented the key elements of its trilateration location technique in Philadelphia, collected and analyzed performance data, and documented the results in this report. The Hazeltine system determines the position of mobile units by measuring the arrival times of the lead edge vehicle pulse transmissions at a limited number of fixed receiver sites. Differences in time-of-arrival (TOA) of the transmissions are used by a central processor to compute the coordinates of the mobile units. Fixed signpost transmitters are used to improve time of passage accuracy at slow vehicle speed locations. The system covers fixed route, random route, and special-case situations in both low and high regions, and provides time-of-departure data for fixed route bus/transit applications. Data acquisition is automatic, with the basic data recorded on magnetic tape. Evaluation of the system's performance is provided by off-line simulation, which reflects the conditions and processing procedures proposed for the Phase II AVM tests in Los Angeles.
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