Inferring Wi-Fi Angle-of-Arrival from Received Signal Strength Distribution

R. Mohd Sabri*, T. Arslan

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

We present a technique for inferring Wi-Fi signal's angle-of-arrival (AoA). Specifically, the technique estimates angular direction of an access point from a collection of GPS-tagged received signal strength measurements gathered through network stumbling. Radio waves propagate in all directions from an omni-directional antenna. Along the direction of wave propagation, the strength of radio signal decreases as it travels away from the transmitter. By correlating the network stumbling trajectory with the received signal strength characteristics, an estimate of the direction of wave propagation can be inferred. A steep gradient along relatively short stumbling path implies trajectory is parallel to the direction of wave propagation and can be used to infer AoA with high degree of accuracy. A relatively flatter received signal strength gradient implies the stumbling trajetory vector is made up of orthogonal component relative to direction of wave propagation. This results in two possible AoA estimates. By combining several AoAs along non co-linear orthogonal paths, the correct AoA can be inferred being the angles that converge into common direction.

Original languageEnglish
Title of host publicationPROCEEDINGS OF THE 24TH INTERNATIONAL TECHNICAL MEETING OF THE SATELLITE DIVISION OF THE INSTITUTE OF NAVIGATION (ION GNSS 2011)
Place of PublicationWASHINGTON
PublisherINST NAVIGATION
Pages1731-1736
Number of pages6
Publication statusPublished - 2011
Event24th International Technical Meeting of the Satellite Division of the Institute of Navigation (ION GNSS) - Portland, United Kingdom
Duration: 20 Sep 201023 Sep 2010

Conference

Conference24th International Technical Meeting of the Satellite Division of the Institute of Navigation (ION GNSS)
Country/TerritoryUnited Kingdom
Period20/09/1023/09/10

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