Results 21 to 30 of about 4,619 (193)

A Calibration Method of Underwater Transponder Position Based on Maximum Correntropy

水下无人系统学报, 2023
The ultra-short baseline(USBL) positioning system is widely used in the integrated navigation and positioning of underwater vehicles. Knowing the precise position of the transponder is a prerequisite for the application of the USBL system for navigation ...
Peijuan LI, Shutao YANG, Rui LI, Junfeng DU, Yiting LIU   +4 more
doaj   +1 more source

Highly Accurate Radar Cross-Section and Transfer Function Measurement of a Digital Calibration Transponder without Known Reference—Part II: Uncertainty Estimation and Validation

Remote Sensing, 2023
Active radar calibrators (ARCs), also known as calibration transponders, are often used as reference targets for the absolute radiometric calibration of radar systems due to their large radar cross-sections (RCSs).
Jens Reimann, Anna Maria Büchner, Sebastian Raab, Klaus Weidenhaupt, Matthias Jirousek, Marco Schwerdt   +5 more
doaj   +1 more source

Evaluation of the marking duration of iophenoxic acid (IPA) derivatives in raccoons (Procyon lotor)

The Journal of Wildlife Management, EarlyView.
We evaluated the marking duration and intensity of iophenoxic acid (IPA) analogues in raccoon (Procyon lotor) serum following consumption of test doses encapsulated in a marshmallow or formulated into an oral rabies vaccine bait matrix. The IPA biomarkers demonstrated utility for evaluation of oral rabies vaccination baiting strategies targeting ...
Shylo R. Johnson, Amy J. Davis, Molly R. Selleck, Alison P. Barbee, Steven F. Volker, Are R. Berentsen, David A. Goldade, Amy T. Gilbert   +7 more
wiley   +1 more source

Digital Predistortion in High Throughput Satellites: Architectures and Performance

IEEE Access, 2021
The future of satellites lies in the deployment of high throughput satellites (HTS). Moreover, HTS will also play an important role in the up coming 5G mobile networks where HTS will provide services like disaster relief, remote automation, maritime ...
Ovais Bin Usman, Andreas Knopp
doaj   +1 more source

Fish Migration Through Ship Locks at the Danube River, Austria

River Research and Applications, EarlyView.
ABSTRACT Longitudinal connectivity in the Austrian section of the Danube has improved over the last three decades thanks to the progressive installation of fish passage facilities at hydropower plants. However, navigation locks which are present at all barrages remain poorly quantified with respect to their role in fish migration.
Walter Reckendorfer, Barbara Grüner, Renate Degen, Regina Petz‐Glechner, Ursula Scheiblechner, Michael Schabuss   +5 more
wiley   +1 more source

An Action Plan Towards Fiducial Reference Measurements for Satellite Altimetry

Remote Sensing, 2019
Satellite altimeters have been producing, as of 1992, an amazing and historic record of sea level changes. As Europe moves into full operational altimetry, it has become imperative that the quality of these monitoring signals with their uncertainties ...
Stelios P. Mertikas, Craig Donlon, Pierrik Vuilleumier, Robert Cullen, Pierre Féménias, Achilles Tripolitsiotis   +5 more
doaj   +1 more source

Integrating Image Segmentation and Deep Learning to Improve Radio Frequency Propagation Models

International Journal of Satellite Communications and Networking, EarlyView.
ABSTRACT This paper proposes a multi‐sensor approach to improve radio frequency (RF) propagation models, which play a key role in the rapidly expanding field of connected vehicle technology. Focusing on the 1‐ to 20‐GHz frequency range, which is critical for both satellite‐to‐vehicle and base station‐to‐vehicle communications, our study introduces a ...
Jonathan Israel, Xavier Boulanger, Vegard Arneson   +2 more
wiley   +1 more source

ML‐Assisted Adaptive Fade Mitigation for Satellite Connectivity

International Journal of Satellite Communications and Networking, EarlyView.
ABSTRACT The demand for reliable and high‐quality wireless networks driven by resource‐intensive applications and services is growing rapidly and invoked the emergence of beyond 5G (B5G) and 6G paradigm and technologies which include satellite systems as part of the nonterrestrial networks (NTN).
Jinwara Surattanagul, Abdulkareem Karasuwa, Kamolideen Abolarinwa, Jonathan Rodriguez, Ifiok Otung   +4 more
wiley   +1 more source

Assessing physiological, behavioral and movement responses to Suprelorin implant delivery methods in free‐ranging eastern grey kangaroos Macropus giganteus

Wildlife Biology, EarlyView.
Overabundant populations of eastern grey kangaroos Macropus giganteus in peri‐urban areas pose ecological and social challenges. Current management strategies are often hindered by animal welfare and logistical concerns. This study aimed to assess stress responses of kangaroos to two contraceptive delivery methods.
Fabiola R. O. Silva, Sebastien Comte, Tamara Keeley, Maquel Brandimarti, Catherine A. Herbert   +4 more
wiley   +1 more source

Fifteen Years of Cal/Val Service to Reference Altimetry Missions: Calibration of Satellite Altimetry at the Permanent Facilities in Gavdos and Crete, Greece

Remote Sensing, 2018
Satellite altimetry provides exceptional means for absolute and undisputable monitoring of changes in sea level and inland waters (rivers and lakes), over regional to global scales, with accuracy and with respect to the center of mass of the Earth ...
Stelios P. Mertikas, Craig Donlon, Pierre Féménias, Constantin Mavrocordatos, Demitris Galanakis, Achilles Tripolitsiotis, Xenophon Frantzis, Ilias N. Tziavos, George Vergos, Thierry Guinle   +9 more
doaj   +1 more source