TDOA-MCM: A TDOA-based Multi-path Communication Mechanism for UWB Indoor Positioning

• Xuan Lu,
• Jinhong Guo,
• Furong Peng,
• Yu Dong,

Vol. 19, No. 1, January 31, 2025
10.3837/tiis.2025.01.016, Download Paper (Free):

• UWB
• Indoor Positioning
• TDOA Positioning
• multi-path communication
• Clock synchronization

Abstract

UWB-based indoor positioning technique presents superior performance but suffers from accuracy degradation caused by clock desynchronization in real situations. This paper proposes a TDOA-based multi-path communication mechanism (TDOA-MCM) to address this issue. One base station transmits the signal that arrives at the tag via two paths. One is the direct path, and the other is via a relay station. According to the time difference between the two signals, the tag calculates its position using the Gaussian-Newton algorithm. The Cramer-Rao bound is used to evaluate the performance of the proposed TDOA-MCM. Due to an additional path from the transmitter to the relay, its performance is slightly worse than the ideal clock-synchronized TDOA which is not achievable in real situations. However, it outperforms the TDOA with clock drift or desynchronization, which is validated by simulation results. Using DW1000-based commercial positioning modules, single and multiple tag positioning experiments were conducted, achieving positioning errors of less than 10 cm.

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