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Published on: July 27, 2018
Optimization of Time Synchronization and Algorithms with TDOA Based Indoor Positioning Technique for Internet of
Kun Zhao1,2, Tiantian Zhao3, Zhengqi Zheng1,2
1Engineering Center of SHMEC for Space Information and GNSS, East China Normal University, Shanghai 200241, China.
Abstract:
To provide high-precision positioning for Internet of Things (IoT) scenarios, we optimize the indoor positioning technique based on Ultra-Wideband (UWB) Time Difference of Arrival (TDOA) equipment. This paper analyzes sources of positioning error and improves the time synchronization algorithm based on the synchronization packet. Then we use the labels of the known position to further optimize the time synchronization performance, and hence improve TDOA measurements. After time synchronization optimization, a Weighted Least Square (WLS) and Taylor coordination algorithm is derived. Experiments show that our optimization reduces the average positioning error from 54.8 cm to 12.6 cm.
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