Article
Multidisciplinary Sciences
Mohammud J. Bocus, Robert Piechocki
Summary: This paper presents a dataset obtained from RF devices for passive tracking of indoor targets and advancing UWB-based human activity recognition. The dataset is significant for the development of algorithms and methodologies in healthcare, smart homes, and security applications.
Article
Chemistry, Multidisciplinary
Jianchun Xu, Zhao Li, Xuchao Pan, Xi Wen, Jinqing Cao, Wen Gong, Shaolong Yang, Ming Lei, Fangzhou Yao, Ke Bi
Summary: Mechanical antennas based on piezoelectric materials can significantly reduce the size of long wave antennas and improve communication capacity. However, their narrow bandwidth and weak field intensity limit their practical applications. A mechanical antenna based on PMN-PT is proposed to address these limitations and exhibits ultra-wideband characteristics and excellent communication properties.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Alireza Ansaripour, Milad Heydariaan, Kyungki Kim, Omprakash Gnawali, Hafiz Oyediran
Summary: Pose estimation is crucial for real-time safety monitoring in road construction sites. UWB radios are considered as promising sensing technology for accurate object localization. However, the performance of UWB radios declines in road construction environments due to blockages, resulting in Non-Line of Sight (NLOS) situations. To address this issue, a real-time pose estimating system called ViPER+ is proposed, which overcomes NLOS situations and accurately determines the boundary of heavy construction equipment using multiple UWB tags. Evaluation results show that embedding NLOS detection technique in UWB-based pose estimation improves location accuracy by 40% and update rate by 25% compared to the previous implementation (ViPER).
APPLIED SCIENCES-BASEL
(2023)
Article
Chemistry, Physical
Zhipeng Zheng, Ying Zheng, Yao Luo, Zao Yi, Jianguo Zhang, Zhimin Liu, Wenxing Yang, Yang Yu, Xianwen Wu, Pinghui Wu
Summary: This study proposes a terahertz metamaterial absorber that combines metamaterial structures and a VO2 film. Flexible switching of absorption performance and an ultra-broadband perfect absorption with a bandwidth of 3.3 THz can be achieved through temperature adjustment. The study also highlights the wide thermal tuning range of spectral absorbance.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Engineering, Aerospace
Ning Zhou, Lawrence Lau, Ruibin Bai, Terry Moore
Summary: This paper proposes two novel velocity determination approaches for indoor positioning using particle filtering algorithms, achieving performance similar to the Rao-Blackwellized particle filter. The methods presented in this paper allow for similar positioning accuracy with less computation time compared to standard particle filters. Additionally, integrating Angle-of-Arrival measurements into particle-filter-based positioning significantly improves the 3-D positioning accuracy.
NAVIGATION-JOURNAL OF THE INSTITUTE OF NAVIGATION
(2021)
Article
Multidisciplinary Sciences
Akash Biswas, Constantinos L. Zekios, Collin Ynchausti, Larry L. Howell, Spencer P. Magleby, Stavros Georgakopoulos
Summary: Designers face the challenge of balancing the trade-off between manufacturing cost and performance as they aim to increase the bandwidth of absorbers. To address this challenge, researchers propose a new approach that combines origami math with electromagnetics to develop an ultra-wideband absorber with minimal fabrication and assembly cost. This novel design successfully achieves an absorptivity above 90% in a 24.6:1 bandwidth, demonstrating the potential for practical applications in mitigating signal interference.
SCIENTIFIC REPORTS
(2022)
Article
Robotics
Kailai Li, Ziyu Cao, Uwe D. Hanebeck
Summary: We present a novel framework for continuous-time ultra-wideband-inertial sensor fusion for motion estimation in real-time. This framework utilizes quaternion-based cubic cumulative B-splines for continuous parameterization of motion states. Additionally, systematic derivations for analytic kinematic interpolations and spatial differentiations are provided. The proposed system, SFUISE, is evaluated using public data sets and experiments, showcasing superior performance compared to state-of-the-art discrete-time schemes. The source code and experimental data are available at https://github.com/KIT-ISAS/SFUISE.
IEEE ROBOTICS AND AUTOMATION LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Taoming Lu, Jiong Wu, Zhaoyang Shen, Youcheng Wang, Houyuan Cheng, Yujun Li, Yuejie Yang, Helin Yang
Summary: The metasurface is a subwavelength structure-based ultra-thin device with strong light field control ability. In this article, a novel ultrathin metasurface is proposed, which can function as a beam splitter and controls the polarization of electromagnetic waves. Broadband operation and phase control are achieved based on geometric phase theory.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2022)
Article
Engineering, Aerospace
Juri Sidorenko, Volker Schatz, Norbert Scherer-Negenborn, Michael Arens, Urs Hugentobler
Summary: This article explores the warm-up error in indoor localization using ultra-wideband technology, providing a simple and effective solution to significantly improve measurement accuracy.
IEEE TRANSACTIONS ON AEROSPACE AND ELECTRONIC SYSTEMS
(2021)
Article
Optics
Yi Zhang, Liang Peng, Zhengjie Huang, Lixin Ran, Dexin Ye
Summary: This study demonstrates that reflectionless propagation of electromagnetic waves between two different materials can be achieved by designing an intermediate temporal medium. By considering a multi-stage variation of the material's permittivity in the time domain, an ultra-wideband antireflection temporal medium is obtained. The multi-stage design implies a continuously temporal variation of the material's constitutive parameters, leading to the realization of an ultra-wideband antireflection temporal medium.
Article
Optics
Qunbi Zhuge, Xi Chen, David Plant, William Shieh
Summary: This Feature Issue covers important aspects of developing ultra-wideband optical communication systems, including optoelectronics, impairment modeling and compensation, optical amplification, superchannel and multi-band transmission and control, and more. This Introduction provides a summary of the articles on these topics in this Feature Issue.
Article
Chemistry, Multidisciplinary
Faroq Razzaz, Saud M. Saeed, Majeed A. S. Alkanhal
Summary: This paper presents ultra-wideband bandpass filters using tapered transmission line resonators. The filters based on short-circuited tapered transmission line stubs achieve a significant length reduction, wider operational bandwidth, and improved stopband characteristics. Filters with different tapered ratios using exponential or linear tapered transmission line resonators are designed, and they show similar performance. The fabricated filters on a Roger RT5880 substrate exhibit good agreement between simulated and measured results, with a return loss better than 17 dB and insertion loss better than 1 dB over the entire UWB spectrum, as well as notable improvements in stopband characteristics.
APPLIED SCIENCES-BASEL
(2022)
Article
Computer Science, Information Systems
Bingjie Wang, Ruixin Xie, Hang Xu, Jianguo Zhang, Hong Han, Zhaoxia Zhang, Li Liu, Jingxia Li
Summary: The proposed ultra-wideband chaotic radar utilizes wireless synchronization command for target localization and tracking, achieving high accuracy and immunity to external electromagnetic interferences.
Article
Computer Science, Information Systems
Mahdi Zoghi, Farrokh Hodjatkashani, Mir Emad Lajevardi
Summary: This paper proposes an ultra-wideband multibeam antenna with eight radiating elements connected to a central cylindrical part, providing a wide frequency band performance. The antenna structure is optimized to minimize return losses and cross-coupling between ports. The measured and simulated results show good agreement, confirming the proper performance of the antenna in the frequency range of 2-18 GHz. With a smaller size and high-power handling, the proposed antenna is suitable for high-power applications.
Article
Multidisciplinary Sciences
Mahdi Norouzi, Saughar Jarchi, Mohsen Ghaffari-Miab, Meisam Esfandiari, Ali Lalbakhsh, Slawomir Koziel, Sam Reisenfeld, Gholamhosein Moloudian
Summary: This paper proposes a low-cost, lightweight absorber for curved surfaces using a three-dimensional metamaterial absorber based on a resistive film patch array. The absorber achieves excellent absorption over a large frequency band through two different mechanisms: attenuation of wave power via resistive films and intensified absorption through magnetic dipoles created by surface currents. The simulation results demonstrate broadband absorptivity greater than 85% from 35 to 400 GHz for TE and TM polarization waves, with wide absorption bandwidth above 85% and 90%.
SCIENTIFIC REPORTS
(2023)
Article
Sport Sciences
Michele Lo, Robert J. Aughey, Andrew M. Stewart, Nicholas Gill, Brent McDonald
Summary: The study found two main strategies to reduce the impact of air travel on players' performance and well-being – clinical and holistic, while team culture and practices are seen as important factors.
JOURNAL OF SPORTS SCIENCES
(2021)
Article
Multidisciplinary Sciences
Ana C. Holt, Kevin Ball, Rodney Siegel, William G. Hopkins, Robert J. Aughey
Summary: The study investigated the relationships between boat acceleration and velocity in rowing, aiming to identify potential performance-enhancement strategies. Results showed that certain boat acceleration measures had significant effects before adjustment for stroke rate and power, but most effects reduced after adjustment, with some measures remaining significant in certain boat classes. These findings suggest that greater absolute values of certain acceleration measures are associated with improved performance in rowing, providing potential strategies for enhancing performance beyond increases in stroke rate and power output.
Review
Sport Sciences
Robert I. M. Delves, Robert J. Aughey, Kevin Ball, Grant M. Duthie
Summary: The review highlights the common use of GPS/GNSS technology in quantifying external acceleration load in team sport research, with count-based metrics being predominant. However, information regarding data processing and minimum effort duration is lacking in many studies, indicating a need for more detailed reporting in future research.
SPORTS MEDICINE-OPEN
(2021)
Article
Sport Sciences
Jace A. Delaney, Benjamin A. McKay, Jim Radcliffe, Dean T. Benton, Pierre Samozino, Jean-Benoit Morin, Grant M. Duthie
Summary: The study found that the load-velocity relationship of hill sprinting was valid and reliable under different hill gradients, with velocity decreasing as slope increased. Hills with gradients up to 17.6% did not provide sufficient resistance for optimal power development.
JOURNAL OF SPORTS SCIENCES
(2022)
Article
Multidisciplinary Sciences
Michele Lo, Robert J. Aughey, William G. Hopkins, Nicholas Gill, Andrew M. Stewart
Summary: This study aimed to quantify the impact of matches and travel on the sleep, wellness, and training of Super Rugby players. The results showed that overseas matches led to reduced sleep and wellness levels, which recovered somewhat upon return. There were also differences between teams in the impact of matches on sleep and wellness.
Article
Sport Sciences
Robert J. Aughey, Kevin Ball, Sam J. Robertson, Grant M. Duthie, Fabio R. Serpiello, Nicolas Evans, Bartholomew Spencer, Susanne Ellens, Emily Cust, Jade Haycraft, Johsan Billingham
Summary: This study established the validity of VisionKit computer vision system against three-dimensional motion capture in a stadium environment. The results showed strong agreement between VisionKit and three-dimensional motion capture across each activity. Therefore, VisionKit can be used to establish the concurrent validity of other electronic performance and tracking systems in circumstances where three-dimensional motion capture cannot be used.
SPORTS ENGINEERING
(2022)
Article
Sport Sciences
Robert I. M. Delves, Grant M. Duthie, Kevin A. Ball, Robert J. Aughey
Summary: This study aimed to determine if there were differences in acceleration during team-sport locomotion between different GNSS manufacturers. Data from professional rugby league athletes wearing devices from two manufacturers (GPSports EVO and STATSports Apex) were analyzed. The study found no substantial differences in speed and filtered acceleration between manufacturers, but there were substantial differences in acceleration variables derived from the proprietary software of each manufacturer.
JOURNAL OF SPORTS SCIENCES
(2022)
Article
Sport Sciences
Sam Gregory, Sam Robertson, Robert Aughey, Grant Duthie
Summary: This research adds context to a player's movement in football by analyzing the differences in movement metrics across phases of play and in-game win probabilities. The results demonstrate that there are differences in movement profiles across possession phases and in-game win probabilities, while overall positional trends are negligible.
JOURNAL OF SPORTS SCIENCES
(2022)
Article
Sport Sciences
Robert I. M. Delves, Heidi R. Thornton, Joshua Hodges, Balin Cupples, Kevin Ball, Robert Aughey, Grant M. Duthie
Summary: The study examined the impact of the "six-again" rule change on athletes in the Australian National Rugby League. The analysis of GNSS data showed that the introduction of this rule led to a significant increase in acceleration for all positions and an overall higher average acceleration during matches. This suggests that the game of rugby league now requires athletes to have greater acceleration, and coaches should adjust their training programs accordingly.
SCIENCE AND MEDICINE IN FOOTBALL
(2023)
Article
Sport Sciences
Alexander R. Calder, Grant M. Duthie, Richard D. Johnston, Heather D. Engel
Summary: This study aimed to quantify the external outputs of women's collegiate lacrosse competition and determine any positional differences using GPS data from 14 players across 7 NCAA division-1 conference games. Results showed that defenders covered more distance throughout the match and all positions exhibited a decrease in speed, acceleration, and metabolic power in the second half. The study provided valuable insights for coaches to prescribe appropriate training drills for game preparation.
SPORT SCIENCES FOR HEALTH
(2021)
Article
Multidisciplinary Sciences
Stephanie Blair, Sam Robertson, Grant Duthie, Kevin Ball