Application of Differential Time Synchronization in Indoor Positioning

Abstract

Indoor positioning technologies based on Wi-Fi and Bluetooth usually have low accuracy. Also, timing error is such a common problem that can be found in Ultra-wide Band (UWB) positioning systems. In this paper, principles and main sources of errors for differenced time synchronization techniques are studied based on UWB, and a cooperative location algorithm based on differenced time synchronization of fixed nodes and Taylor is proposed and verified. We store the differenced delay of the fiber-optic propagation and mechanical device between fixed nodes by calculating the difference between the estimated position and the real position of a synchronous node in the local server and use it to eliminate errors in the positioning processing. Compared with the traditional algorithm [1], the accuracy of the cooperative location algorithm is 7.4 cm, which is improved by 29.5%.