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Implementation of Ad-hoc Low Bandwidth Mesh Network for Aircraft


C. Dobler

Semester/Bachelor Thesis, FS 09

Flarm is a low-cost collision avoidance system for general aviation aircraft. Since its inception in 2004, it has been installed in over 10000 aircraft worldwide, particularly gliders. In Switzerland, almost every glider is equipped with a Flarm compatible device. Flarm operates by periodically measuring its own position by means of GPS, then broadcasting the predicted path over a wireless radio link. Additionally, the radio link could be used to transmit arbitrary data not related to collision avoidance. For instance, stationary ground units on an airfield could provide wind and radio frequency information, or an emergency signal could be sent across a large distance by relaying from node to node. The system is tightly constrained due to its embedded nature. Most importantly, the usable bandwidth is limited to only a few dozens of bytes per second. The embedded processor also has limitations regarding RAM and processing power. Finally, the radio range is limited to 2-4km. Hence, the topology of the network changes constantly as the aircraft move around. In this work, an implementation of an ad-hoc networks for Flarm devices shall be developed.


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(13)Semester/Bachelor Thesis

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% Autogenerated BibTeX entry
@PhdThesis { Xxx:2009:IFA_3276
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