Resonant Beam Multi-Target DOA Estimation

TL;DR

This paper introduces a resonant beam system for multi-target RF localization, enabling a single base station to accurately estimate the direction of multiple passive targets with minimal beam control, suitable for IoT applications.

Contribution

It proposes a novel multi-target resonant system architecture with a retro-directive array for independent multi-target localization in RF bands, achieving high DOA accuracy with minimal beam control.

Findings

Supports resonant establishment with multiple targets

Achieves DOA error less than 1 degree within 6 meters

Outperforms active beamforming localization systems

Abstract

With the increasing demand for internet of things (IoT) applications, especially for location-based services, how to locate passive mobile targets (MTs) with minimal beam control has become a challenge. Resonant beam systems are considered promising IoT technologies with advantages such as beam self-alignment and energy concentration. To establish a resonant system in the radio frequency (RF) band and achieve multi-target localization, this paper designs a multi-target resonant system architecture, allowing a single base station (BS) to independently connect with multiple MTs. By employing a retro-directive array, a multi-channel cyclic model is established to realize one-to-many electromagnetic wave propagation and MT direction-of-arrival (DOA) estimation through echo resonance. Simulation results show that the proposed system supports resonant establishment between the BS and multiple MTs. This helps the BS to still have high DOA estimation accuracy in the face of multiple passive MTs, and can ensure that the DOA error is less than 1 degree within a range of 6 meters at a 50degree field of view, with higher accuracy than active beamforming localization systems.