Asynchronous distance measurement for smartphone-based localization exploiting chirp signals

Abstract

In this paper, we present an asynchronous, accurate, and realtime distance measurement method using chirp signals, which is capable of accurately locating and tracking, thus forming an ad-hoc network among smartphones in an indoor (e.g., smart meeting room) environment. We then implement our proposed method on top of commercial off-the-shelf smartphones without modifying their hardware or OS kernel. Our experimental results demonstrate that it takes < 1 second to conduct network-wide distance measurements and the measurement error is <10cm in at least 87% of the experiments. Copyright © 2015 ICST.