[B-1C] Antennas and Propagation C (Antenna Systems)

11:00 AM - 11:15 AM JST(2:00 AM - 2:15 AM UTC)

[B-1C-38] Implementation and Evaluation of Two-Tone Two-Way Ranging (TTTWR) Using SDR

〇Ren Masuda¹, Koki Hirai¹, Yuxuan Ding¹, Minseok Kim¹, Sumio Morioka^2,3, Syutai Okamura² (1. Niigata University, 2. Interstellar Technologies Inc., 3. The University of Osaka)

Keywords:

Two-Tone Two-Way Ranging(TTTWR),Software-Defined Radio (SDR),Carrier-phase ranging,Phase ambiguity resolution,Wireless phased array antenna

Beamforming in wireless (non-cabled) phased array antennas requires precise phase synchronization, which in turn demands inter-element positioning accuracy on the order of millimeters. In this paper, as a preliminary study, we implement a ranging method using a software-defined radio (SDR) that cancels hardware-induced errors through two-way communication and loopback measurement, thereby extracting only the propagation phase. Furthermore, to resolve the range ambiguity arising from the carrier phase wrapping with a period of 2π, we attempt to obtain the absolute distance using Two-Tone Two-Way Ranging (TTTWR), in which two tones with a small frequency offset are employed to jointly estimate the wrap count and the phase.