April 1, 2015 Thesis Open Access

Solomon Firew Hailu

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    <subfield code="a">Power line communication based real time train tracking system for Addis Ababa light rail transit</subfield>
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    <subfield code="a">&lt;p&gt;In railway traffics the low friction between wheel and rail causes long braking distances, normally much longer than the driver"s sight distance, i.e. if the driver starts the braking when he discovers a problem on the track it is too late to stop the train. The conclusion will be that the railway traffic can not only rely on the driver for the traffic safety, there must also be a signaling or even an automatic surveyor system, which can supervise the positions of different trains along the track and organize the traffic. Having the traffics information on the track helps to avoid situations of conflict and those that might be potentially unsafe.&lt;br&gt;
There are different train detection systems in service worldwide. Track circuit, Axle counter and GPS are the most prevailed approaches. The first two types provide the information that whether the section is occupied or not. They don"t provide the information &amp;ldquo;where exactly the train is?&amp;rdquo; Beside Axle counter has huge installation cost and maintenance cost. Regarding GPS, since it is using satellites to determine the location of the train and the accuracy is dependent on the no of satellites tracked, the error spread is variable. In addition to this it doesn"t operate in tunnels like we have for A.A LRT (Addis Ababa Light Rail Transit) track, from St. George church to Atikilit tera. Not only these but also since the satellites are administered by third party, the operation is totally out of the control of the railway company&lt;/p&gt;</subfield>
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