One-Way Ranging (OWR)-Based Positioning Technique with Time-Asynchronized UWB Anchor Nodes

초록

With the increasing demand for location-based services, precise location estimation technology is becoming increasingly important. In particular, UWB technology enables precise location estimation at the centimeter level by utilizing a wide bandwidth of more than 500 MHz, so major smartphone manufacturers are actively applying UWB technology. Ranging methods using UWB are generally classified into two-way ranging (TWR) and one-way ranging (OWR). The OWR method has the advantage of simplicity, but has the constraint that the time synchronization between UWB devices must be precisely maintained for high accuracy. To overcome these limitations, in this paper, we propose an innovative OWR-based positioning technique enabling precise location estimation under the condition that UWB anchor nodes are not time-synchronized, by estimating and calibrating the time-asynchrony between UWB anchor nodes using Kalman filter. Also, we validate the positioning performance of the proposed method through simulation and confirm that it can achieve similar performance with an acceptable error range as in an ideal scenario where all devices are synchronized. © 2024, Korean Institute of Communications and Information Sciences. All rights reserved.

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