"Iridescent" Reflective Tags to Enable Radar-based Orientation Estimation
Onel L. A. L\'opez, Zhu Han, Ashutosh Sabharwal

TL;DR
This paper introduces passive iridescent reflective tags for radar systems, enabling accurate object orientation estimation with low complexity and analyzing factors affecting performance through simulations.
Contribution
It proposes a novel tag design based on leaky-wave antennas and develops a framework for orientation estimation using multi-tone radar, demonstrating near-optimal accuracy with low complexity.
Findings
Low impact of imperfect tag location on accuracy
Estimator performance depends mainly on system bandwidth
Optimal number of tones increases with sensing time under power constraints
Abstract
Accurate orientation estimation of objects can aid in scene understanding in many applications. In this paper, we consider use cases where passive tags could be deployed to assist radar systems in estimating object orientation. Towards that end, we propose the concept of passive iridescent reflective tags that selectively reflect different wavelengths in different directions. We propose a conceptual tag design based on leaky-wave antennas. We develop a framework for signal modeling and orientation estimation with a multi-tone radar. We analyze the impact of imperfect tag location information, revealing that it minimally impacts orientation estimation accuracy. To reduce estimator complexity, we propose a radiation pointing angle-based estimator with near-optimal performance. We derive its feasible orientation estimation region and show that it depends mainly on the system bandwidth.…
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Taxonomy
TopicsIndoor and Outdoor Localization Technologies · Antenna Design and Optimization · Antenna Design and Analysis
