Results 161 to 170 of about 47,243 (312)

GNSS Satellite Orbit Validation Using Satellite Laser Ranging

, 2013
With a total of four new regional and global navigation sa tellite systems that have launched first satellites or even started an operational serv ice, the GNSS landscape has experienced major changes in recent years.
Steigenberger, Peter, Montenbruck, Oliver, Kirchner, Georg   +2 more
core  

Gnss-denied unmanned aerial vehicle navigation: analyzing computational complexity, sensor fusion, and localization methodologies

Satellite Navigation
Navigation without Global Navigation Satellite Systems (GNSS) poses a significant challenge in aerospace engineering, particularly in the environments where satellite signals are obstructed or unavailable.
Imen Jarraya, Abdulrahman S. Al-Batati, Muhammad Bilal Kadri, Mohamed Abdelkader, A. Ammar, Wadii Boulila, Anis Koubaa   +6 more
semanticscholar   +1 more source

Satellite navigation interference monitoring in the Baltic and North Seas

The threats scenario of radio-frequency interference in maritime domain has been assessed through the results of measurement campaigns in the Baltic and North Seas. This work presents the monitoring equipment deployed for real-time interference detection
Azevedo de Vasconcelos, Thiago, Meurer, Michael, Konovaltsev, Andriy, Ehlers, Tobias, Kurz, Lothar   +4 more
core   +1 more source

Overview of the development of satellite navigation blanket interference monitoring

Frontiers in Physics
Satellite navigation interference monitoring is an important means to effectively evaluate interference and ensure the normal operation of global navigation satellite system (GNSS).
Yinhui He, Yinhui He, Baiyu Li, Baiyu Li, Jinping Chen, Zhi Wang, Wei Xiao, Wei Xiao, Zukun Lu, Zukun Lu   +9 more
doaj   +1 more source

Satellite Navigation Systems

, 2016
This chapter describes the Global Navigation Satellite Systems (GNSS) used for positioning and navigation applications. Although a satellite navigation system is very complex, it is common to speak of a “satellite navigation system sensor” when ...
ZANZI, MATTEO, Geri, Walter, Shebshaevich, Boris V.   +2 more
core  

Impact of Cattaneo–Christov Heat and Mass Flux on MHD Hybrid Nanofluid Flow Over an Extending Surface With Convective and Mass Flux Effects

Asia-Pacific Journal of Chemical Engineering, EarlyView.
ABSTRACT This study investigates the flow of a magnetized hybrid nanofluid over a permeable stretching surface. The mass and thermal transport within the system is regulated using the Cattaneo–Christov flux theory. The fluid is additionally subjected to thermophoresis, chemical reaction, Brownian motion, and activation energy effects.
Ebrahem A. Algehyne, Abdul Bariq, Mounirah Areshi, Fahad Maqbul Alamrani, Zehba Raizah, Izharul Haq, Anwar Saeed   +6 more
wiley   +1 more source

Quantum Phenomena in Molecular and Biological Systems: A Decoherence‐Based Decision Framework With Falsifiable Predictions and a Failure‐Mode Taxonomy

Advanced Physics Research, EarlyView.
A physics‐grounded framework based on decoherence timescales (τ_dec vs τ_func), Markovian validity, and falsifiability criteria is applied across molecular systems to distinguish where quantum effects are necessary, marginal, or irrelevant. The analysis integrates quantum chemistry, biological quantum mechanisms, and quantum computing under a unified ...
Sarfaraz K. Niazi
wiley   +1 more source

Real time hardware in the loop simulation testbed of spacecraft formation flying

, 2008
The great potential benefits associated with SFF (satellite formation flying) have led to considerable research in this concept around the world. As it is a new field of research and the implementation of formation flying in practice brings some inherent
Ahmed, Riaz
core  

Endothermy, neuron counts, and other issues: Further remarks on neurocognitive evolution in fossil vertebrates

The Anatomical Record, EarlyView.
Abstract Last year, we challenged the view that large‐bodied theropod dinosaurs such as Tyrannosaurus rex resembled primates in cognition and behavior, a proposition made by Herculano‐Houzel in 2023. More recently, Jensen et al. have criticized our work on this topic, raising methodological and conceptual issues.
Kai R. Caspar, Cristián Gutiérrez‐Ibáñez, Hady George, Thomas R. Holtz Jr., Darren Naish, Grant R. Hurlburt   +5 more
wiley   +1 more source

Descriptive, comparative, and functional anatomy of the facial musculature in cattle (Bos taurus)

The Anatomical Record, EarlyView.
Abstract Facial expressions can provide insight into animal emotions and pain, but no standardized system for assessing the entire facial display in cattle (Bos taurus Linnaeus) exists. The Facial Action Coding System (FACS), originally developed for humans, identifies distinct facial movements based on mimetic muscles.
Maja Söderlind, Bridget Cain, Katrina Ask, Jean‐Francois Valarcher, Elin Hernlund, Pia Haubro Andersen, Marie Rhodin   +6 more
wiley   +1 more source