The Horus WLAN location determination system

  • Youssef M
  • Agrawala A
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Abstract

We present the design and implementation of the Horus WLAN location determination system. The design of the Horus system aims at satisfying two goals: high accuracy and low computational requirements. The Horus system identifies different causes for the wireless channel varia- tions and addresses them to achieve its high accuracy. It uses location-clustering techniques to reduce the compu- tational requirements of the algorithm. The lightweight Horus algorithm helps in supporting a larger number of users by running the algorithm at the clients. We discuss the different components of the Horus sys- temand its implementation under two different operating systems and evaluate the performance of the Horus sys- tem on two testbeds. Our results show that the Horus system achieves its goal. It has an error of less than 0.6 meter on the average and its computational requirements are more than an order of magnitude better than other WLAN location determination systems. Moreover, the techniques developed in the context of the Horus sys- tem are general and can be applied to other WLAN lo- cation determination systems to enhance their accuracy. We also report lessons learned from experimenting with the Horus system and provide directions for futurework

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Authors

  • Moustafa Youssef

  • Ashok Agrawala

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