Abstract
This paper presents a utilization of Bluetooth Low Energy (BLE) for a pseudo-ranging determination in indoor positioning systems. Most of BLE-based ranging techniques rely on Received Signal Strength Indicator (RSSI) of the broadcasting beacons, which has a shortcoming as it is highly sensitive to the surroundings or the orientation of the device. Therefore, this paper proposes the two-way Time-of-Flight (ToF) approach for ranging of BLE beacons. The Round-Trip Time (RTT) of the beacons has been measured using a CPU clock cycle generated by an external Temperature Compensated Crystal Oscillator (TCXO), and the pseudo-ranging calculation has been performed afterwards. The study results indicate that the accuracy can be improved by considering the RTT from the advertising channel that gives the best RSSI. The equation representing the relationship between the RTT and distance has been derived.
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Acknowledgements
This research is financially supported by Thailand Advanced Institute of Science and Technology (TAIST), National Science and Technology Development Agency (NSTDA), Tokyo Institute of Technology, Sirindhorn International Institute of Technology (SIIT), Thammasat University (TU) under the TAIST Tokyo Tech Program.
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Hengyotmark, S., Horanont, T., Kaemarungsi, K., Fukawa, K. (2018). Pseudo-ranging Based on Round-Trip Time of Bluetooth Low Energy Beacons. In: Meesad, P., Sodsee, S., Unger, H. (eds) Recent Advances in Information and Communication Technology 2017. IC2IT 2017. Advances in Intelligent Systems and Computing, vol 566. Springer, Cham. https://doi.org/10.1007/978-3-319-60663-7_19
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DOI: https://doi.org/10.1007/978-3-319-60663-7_19
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