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Various RF based location determination systems have been proposed that use received signal strength fingerprints to identify locations. The authors implemented a Bayesian method for location determination in a WLAN testbed and were able to get about 80% accuracy of estimation with a precision of 2.5 meters. They proposed two mechanisms to improve this accuracy: kalman filtering to remove noise in received signal strength readings and a technique which uses estimates from multiple observers to determine the location. Results from an IEEE 802.11b based implementation of the first method shows that kalman filtering during the training phase can increase this accuracy to 90%.
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