Optimization of Ranging Accuracy and Measurement Time Duration for IEEE 802.15.4z UWB

The UWB technology of the IEEE 802.15.4z standard provides excellent performance for indoor positioning based on ultra-wideband. However, the ranging accuracy and the measurement time duration required for ranging vary depending on the two-way ranging method or physical layer parameters used. Although the ranging accuracy and measurement time are important parameters in indoor positioning, research on them to date is insufficient. Therefore, in this study, we first analyzed the ranging accuracy according to the SS-TWR and DS-TWR methods, as suggested by the IEEE 802.15.4z standard, and verified it through experiments. Next, to measure the range quickly using each method, we developed a method to accurately calculate the packet length according to the physical layer parameters and select the optimal time parameter by considering the hardware processing time of the UWB IC. Finally, we implemented the proposed method with the Qorvo DW3000 UWB module and Nordic microcontroller, performed a ranging measurement experiment, and obtained results that were consistent with the proposed results.