  Due to their large bandwidth, relatively low cost, and robust performance,
UWB radio chips can be used for a wide variety of applications, including
localization, communication, and radar. This article offers an exhaustive
survey of recent progress in UWB radar technology. The goal of this survey is
to provide a comprehensive view of the technical fundamentals and emerging
trends in UWB radar. Our analysis is categorized into multiple parts. Firstly,
we explore the fundamental concepts of UWB radar technology from a technology
and standardization point of view. Secondly, we examine the most relevant UWB
applications and use cases, such as device-free localization, activity
recognition, presence detection, and vital sign monitoring, discussing each
time the bandwidth requirements, processing techniques, algorithms, latest
developments, relevant example papers, and trends. Next, we steer readers
toward relevant datasets and available radio chipsets. Finally, we discuss
ongoing challenges and potential future research avenues. As such, this
overview paper is designed to be a cornerstone reference for researchers
charting the course of UWB radar technology over the last decade.
