UWB TDOA/TOA measurement system with wireless time synchronization and simultaneous tag and anchor positioning

As the number of tag increases in the UWB Real Time Localization System (RTLS), the positioning update frequency decreases rapidly. To solve this problem, this paper introduces a TDOA system whose coordinate update frequency is not affected by the number of tags. We also present an algorithm that simultaneously measures the coordinates of Tag and Anchor. We performed wireless time synchronization to improve measurement precision and coordinate accuracy of Tags and Anchors. The experiment result confirmed that the positioning error of about 4 meter when the time synchronization is not applied is reduced to 0.08 meter or less with wireless time synchronization.