Drive-by Localization of Roadside WiFi Networks
by Anand Prabhu Subramanian, Pralhad Deshpande, Jie Gao, Samir R. Das
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| url: | http://www.cs.stonybrook.edu/~jgao/paper/directional-infocom08.pdf | | abstract: | We use a steerable beam directional antenna
mounted on a moving vehicle to localize roadside WiFi access
points (APs), located outdoors or inside buildings. Localizing APs
is an important step towards understanding the topologies and
network characteristics of large scale WiFi networks that are
deployed in a chaotic fashion in urban areas. The idea is to
estimate the angle of arrival of frames transmitted from the
AP using signal strength information on different directional
beams of the antenna – as the beam continuously rotates while
the vehicle is moving. This information together with the GPS
locations of the vehicle are used in a triangulation approach to
localize the APs. We show how this method must be extended
using a clustering approach to account for multi-path reflections
in cluttered environments. Our technique is completely passive
requiring minimum effort beyond driving the vehicle around
in the neighborhood where the APs need to be localized, and
is able to improve the localization accuracy by an order of
magnitude compared with trilateration approaches using omnidirectional
antennas, and by a factor of two relative to other
known techniques using directional antennas. |
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