Drive-By Localization of Roadside WiFi Networks

—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...

• Type: Conference
• Year: 2008
• Where: INFOCOM
• Authors: Anand Prabhu Subramanian, Pralhad Deshpande, Jie Gao, Samir R. Das
• Keywords: Beam Directional Antenna, Communications, Directional Antennas, INFOCOM 2008, Vehicle