ToA-based positioning system for industrial wireless LAN

In this paper, we propose an alternative positioning system using time-synchronized wireless network that can achieve high positioning accuracy without being dependent to any global positioning system (GPS) devices with cm-level accuracy as the main goal and objective. The proposed system utilizes time of arrival (ToA) method in order to estimate the target's position. Based on the results, we can achieve time synchronization with less than 1ns (average offset error of 0.05ns) accuracy and cm-level (position error of 1.23cm) positioning accuracy through our simulation. Furthermore, increasing the number or measuring device in positioning system will increase the accuracy of positioning a target. High accuracy time synchronization is achievable by deploying proposed PTP with high number of iteration in synchronization period. In this research, we aim to deploy the proposed system in industrial wireless LAN. It is applicable by embedding the system into customized wireless LAN chip with positioning ability.