AN EVALUATION OF THE ACCURACY OF A RADIO-TRILATERATION AUTOMATIC VEHICLE LOCATION SYSTEM

Automatic Vehicle Location (AVL) systems is a technology which is of special significance to public transit agencies in their quest to improve services; it allows the monitoring of the location and status of transit vehicles. In order to select a suitable AVL system, there exists a need to evaluate the available AVL systems. This paper addresses the issue of evaluation of the accuracy of a radio-trilateration based AVL system. AirTouch Teletrac, a system utilizing radio-trilateration, which has been in use at Houston METRO for their paratransit services, has been evaluated in respect of its locational accuracy. A general method used for evaluation of accuracy is described which is applicable not only to radio-trilateration, but also to most other AVL technologies. Thereafter, each of four different evaluations for AirTouch accuracy is described. The descriptions include additional test procedures as well as analysis of the data collected. Accuracy has been evaluated in terms of (a) locating a stationary vehicle, (b) locating a stationary vehicle in central business district populated with a high density of high rise buildings, (c) locating a stationary vehicle underground or in covered parking areas, (d) locating a stationary vehicle along the periphery of service area, and (e) locating a moving vehicle. While the accuracy of AirTouch Teletrac is generally sufficient for a large number of vehicle location needs, the system is inconsistent.

Language

  • English

Media Info

  • Features: Figures; Tables;
  • Pagination: p. 25-34

Subject/Index Terms

Filing Info

  • Accession Number: 00724713
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Aug 7 1996 12:00AM