Position Tracking for Virtual Reality Using Commodity WiFi
By Manikanta Kotaru, Sachin Katti.
CVPR, 2017.
[ PAPER (opens in new tab) ]
WiCapture advances the state-of-the-art WiFi based positioning accuracy by two orders of magnitude by reducing the positioning error from few decimeters to few millimeters. To achieve such accurate tracking, one needs to measure time of flight between the WiFi signal source and the WiFi receiver with accuracy of few pico-seconds. However, there is much larger time-offset between the clocks used by the signal source and the receiver, and this offset varies over time. At the heart of the paper is an idea about how we can remove this time-offset by using signal from multiple paths. This result is surprising as multipath is generally considered as a challenge in the localization systems whereas it acts to our advantage here.