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jonathan-placeLab

jonathan-placeLab - Review Accuracy Characterization for...

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Review: Accuracy Characterization for Metropolitan-scale Wi-Fi Localization Authors: Cheng, Chawathe, LaMacra, Krumm 2005 Slides Adapted from Cheng, MobiSys 2005 Review by: Jonathan Odom
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Location, Location, Location Require accurate location for many applications but GPS only works well outdoors and drains battery Wi-Fi APs are commonly found in populated areas and hardware is low cost/low power compared to GPS Use Wi-Fi APs as location beacons Requires map of APs Indoor version RADAR has high overhead Only need accuracy on the order of 10 m Manhattan (Wigle.net)
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War-driving Used to create training data Drive a laptop with Wi-Fi card and GPS through the streets of city and collect information Data – “radio map” AP unique ID GPS location of received signal Signal strength Response Rate
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Experimental Data Sets Downtown (Seattle) Urban Residential (Ravenna) Suburban (Kirkland)
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Algorithm - Centroid 1st of 3/4 algorithms used Use arithmetic mean of positions of all AP’s Not actually use centroid AP AP AP Estimat e
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