TotTernary: A wearable platform for social interaction tracking
MSc thesis
TotTernary provides a mobile, accurate, responsive, and reliable platform for ranging measurements which allows users to gather both distance and position information with decimeter accuracy. Measuring only 61 mm x 35 mm and weighing 7.7 g, it integrates two radios to achieve both low-power neighbour discovery and direct user interactions using Bluetooth Low Energy as well as precise ultrawideband ranging measurements. The system leverages a novel energy-efficient ranging protocol with linear message complexity to achieve lifetimes of up to 39 days. Leveraging both antenna as well as frequency diversity, we demonstrate that the median ranging error can be reduced by up to 86% and that our system is capable of highly reliable and consistent measurements with as little as 14.8 cm of ranging error in the 99th percentile and a 90% confidence interval of 11.3 cm.