All-UWB SLAM Using UWB Radar and UWB AOA

TL;DR

This paper introduces a novel UWB radar SLAM method using UWB AOA measurements to enhance localization accuracy in featureless, vision-denied environments, overcoming limitations of existing feature-based approaches.

Contribution

The paper presents a new approach integrating UWB AOA measurements into UWB radar SLAM, improving performance in environments with few distinguishable features.

Findings

UWB AOA integration improves SLAM accuracy in featureless environments

Dynamic deployment of UWB anchor-tag units enhances mapping capabilities

Experimental results confirm the effectiveness of the proposed method

Abstract

There has been a growing interest in autonomous systems designed to operate in adverse conditions (e.g. smoke, dust), where the visible light spectrum fails. In this context, Ultra-wideband (UWB) radar is capable of penetrating through such challenging environmental conditions due to the lower frequency components within its broad bandwidth. Therefore, UWB radar has emerged as a potential sensing technology for Simultaneous Localization and Mapping (SLAM) in vision-denied environments where optical sensors (e.g. LiDAR, Camera) are prone to failure. Existing approaches involving UWB radar as the primary exteroceptive sensor generally extract features in the environment, which are later initialized as landmarks in a map. However, these methods are constrained by the number of distinguishable features in the environment. Hence, this paper proposes a novel method incorporating UWB Angle of Arrival (AOA) measurements into UWB radar-based SLAM systems to improve the accuracy and scalability of SLAM in feature-deficient environments. The AOA measurements are obtained using UWB anchor-tag units which are dynamically deployed by the robot in featureless areas during mapping of the environment. This paper thoroughly discusses prevailing constraints associated with UWB AOA measurement units and presents solutions to overcome them. Our experimental results show that integrating UWB AOA units with UWB radar enables SLAM in vision-denied feature-deficient environments.