Wireless Data Collection System for Real-Time Arterial Travel Time Estimates
Wireless Data Collection System for Real-Time Arterial Travel Time Estimates
复制标题
用于实时估计主干道行驶时间的无线数据收集系统
DOI：
10.15760/trec.23
复制
发表时间：
2011
期刊：
影响因子：
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通讯作者：
M. Magaña
中科院分区：
文献类型：
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作者：
J. Porter;David S. Kim;M. Magaña
该项目追求的几个目标有利于实施和测试基于蓝牙（BT）的系统，以收集旅行时间数据，包括部署基于BT的旅行时间数据收集系统，对所有组件进行全面测试。安装了两个不同的基于BT的旅行时间数据收集系统。第一个系统由两个DCU组成，安装在位于俄勒冈州塞勒姆的走廊上。对该系统进行了广泛的测试，包括收集旅行时间样本。由五个DCU组成的第二个系统安装在俄勒冈州Tigard市的沿着99 W。由于缺乏网络连接，在99W上进行的数据收集非常有限。六种不同的天线类型，其特征在于使用两个DCU BT为基础的旅行时间数据收集系统。天线特性测试的结果表明，增益在9和12 dBi之间的垂直极化天线是支持基于BT的行程时间数据收集系统的良好候选者。具有圆偏振的天线似乎并没有提高性能，尽管在大多数应用中缺乏对启用BT的设备的方向的控制。旅行时间的样本也收集与此系统。结果表明，一个权衡之间存在的样本数量和这些旅行时间样本的准确性。这种权衡很可能是不同天线类型提供的道路覆盖区域差异的结果。
This project pursued several objectives conducive to the implementation and testing of a Bluetooth (BT) based system to collect travel time data, including the deployment of a BT-based travel time data collection system to perform comprehensive testing on all the components. Two different BT-based travel time data collection systems were installed. The first system, composed of two DCUs, was installed on a corridor located in Salem, OR. Extensive testing was done on this system, including the collection of travel time samples. A second system composed of five DCUs was installed along 99W in the city of Tigard, OR. Very limited data collection was done on 99W due to the lack of network connectivity. Six different antenna types were characterized using the two DCU BT-based travel time data collection system. The result of the antenna characterization tests showed that vertically polarized antennas with gains between 9 and 12 dBi are good candidates to support a BT-based travel time data collection system. Antennas with circular polarization do not seem to improve the performance, despite the lack of control regarding the orientation of BT-enabled devices in most applications. Travel time samples were also collected with this system. The results indicate that a trade-off exist between the number of samples obtained and the accuracy of these travel time samples. This trade-off is most likely the result of differences in road coverage areas provided by the different antenna types.