详情

原文传递 Improved Positioning for Fleet Management and Traveler Information.

题名：	Improved Positioning for Fleet Management and Traveler Information.
作者：	Dailey-D.
关键词：	Transportation-planning; Traffic-management; Transit-systems; Traveler-aid-information.;Urban-areas; Traffic-control; Pedestrians-; Freeways-; Trains-; Vehicles-; Geophysical-positioning-system; Satellites-; Arterials-; Data-collection; Evaluation-.
摘要：	This proposal investigates the possibilities for transit management to take advantage of the ever increasing wireless/Wi-Fi infrastructure in urban areas. In previous projects with Metro and Sound Transit, we have evaluated the use of GPS positioning for fleet management and traveler information. While the GPS positioning worked well for both busses on the regional freeways and trains on regional tracks, it deteriorated when the vehicles entered the dense urban core. This is caused by tall buildings or other structures occluding the GPS satellites. This deviation can be sufficient to place the vehicle on the wrong street and disrupt fleet management and traveler information. An additional source of positioning information is becoming more prevalent by the day, the Wi-Fi hotspot. These act as beacons at known locations. This beacon-like position can be integrated with GPS though optimal is filtering.
报告类型：	科技报告