Accuracy of UWB Location Tracking Devices When on the Move

Abstract

The Ultra-wideband location technology provides high accuracy of indoor positioning. However there is still little work on the accuracy of this solution, especially when monitoring moving objects. The paper shows the results of the measurement of the UWB indoor positioning system accuracy in stationary conditions and shows how the accuracy changes when the monitored object is on the move. It is also measured how the orientation of the antenna influences the accuracy. We show, that while the UWB provides very small error in the stationary scenario (within few centimeters), the accuracy significantly decreases when the device is moving and the average error grows to up to 20 cm. The experimental probability distribution function for different measurement scenarios is presented, showing how the location estimation variates in time and how this is correlated with the actual position of the device.