Results 71 to 80 of about 57,094 (309)

Capturing the Multi‐Decadal Evolution of Glacier–Permafrost Interactions in a High‐Alpine Environment (Ritord, Western Swiss Alps)

Permafrost and Periglacial Processes, EarlyView.
ABSTRACT This study investigates the multi‐decadal evolution of a glacier forefield under permafrost conditions in the Combins Massif (western Swiss Alps). A multi‐method approach based on historical and recent datasets is used to analyze its landform components.
Julie Wee, Hanne Hendrickx, Sebastián Vivero   +2 more
wiley   +1 more source

GNSS-WASP: GNSS Wide Area SPoofing

In this paper, we propose GNSS-WASP, a novel wide-area spoofing attack carried by a constellation of strategicallylocated synchronized transmitters. Unlike known attacks, which are constrained by the attacker’s ability to track victim receivers, GNSS-WASP manipulates the positions measured by all the receivers in a target area without knowing the ...
Christopher Tibaldo, Harshad Sathaye, Giovanni Camurati, Srdjan Capkun   +3 more
openaire   +4 more sources

Kinematic Measurement of the Railway Track Centerline Position by GNSS/INS/Odometer Integration

IEEE Access, 2019
Accurate absolute measurement of existing lines is a task of fundamental importance to provide scientific basis for reconstruction. Traditional railway track survey methods in combination with classical geodetic surveying apparatus such as total stations
Yukun Zhou, Qijin Chen, Xiaoji Niu
doaj   +1 more source

Control System for the Navigation of the Agricultural Robots: A Review

Journal of Field Robotics, EarlyView.
ABSTRACT Control systems for the navigation of autonomous agricultural robots—particularly those operating in uneven terrain and in the presence of static or dynamic obstacles—have advanced considerably in recent years. As conventional machinery evolves toward increasingly automated systems, the design of reliable navigation controllers has become ...
Edna Carolina Moriones Polanía, Hugo Rafacho Fernandes, Daniel Albiero, Angel Pontin Garcia   +3 more
wiley   +1 more source

Autonomous GEO Satellite Navigation with Multiple GNSS Measurements

, 2009
The poor satellite visibility and the weak signal power of the Global Positioning System (GPS) signal reception in side lobes are the main constraint on the Geostationary Earth Orbit (GEO) determination, however, the situation will improve when multi ...
Lim, S ; https://orcid.org/, Qiao, L ; https://orcid.org/, Liu, J, Rizos, C ; https://orcid.org/   +3 more
core   +1 more source

GNSS Jammer Localization and Identification With Airborne Commercial GNSS Receivers

IEEE Transactions on Information Forensics and Security
Global Navigation Satellite Systems (GNSS) are fundamental in ubiquitously providing position and time to a wide gamut of systems. Jamming remains a realistic threat in many deployment settings, civilian and tactical. Specifically, in Unmanned Aerial Vehicles (UAVs) sustained denial raises safety critical concerns.
Marco Spanghero, Filip Geib, Ronny Panier, Panos Papadimitratos   +3 more
openaire   +3 more sources

Deep Reinforcement Learning Based Autonomous Decision‐Making for Cooperative Uncrewed Aerial Vehicles: A Search and Rescue Real World Application

Journal of Field Robotics, EarlyView.
ABSTRACT This paper presents the first end‐to‐end framework that combines guidance, navigation, and centralized task allocation for multiple UAVs performing autonomous search‐and‐rescue (SAR) in GNSS‐denied indoor environments. A twin delayed deep deterministic policy gradient controller is trained with an artificial potential field (APF) reward that ...
Thomas Hickling, Maxwell Hogan, Abdulla Tammam, Nabil Aouf   +3 more
wiley   +1 more source

A Robust GNSS tracking enhancement for hostile environments [PDF]

, 2023
openIn urban environments any GNSS receiver is subjected to frequent sudden losses of the line-of-sight (LOS) signal and to the multipath phenomenon, which drastically reduce the accuracy, robustness and availability of the GNSS service.
TARGA, PIETRO
core  

Automated Lawn Maintenance: An Agronomic and Operational Review of Turf Health, Biodiversity, and Field Performance

Journal of Field Robotics, EarlyView.
ABSTRACT Grass mowing is one of the most resource‐consuming activities in green maintenance, whether in private areas such as home gardens or in public spaces like urban parks. In recent years, concerns related to climate change, human health, and sustainability have become increasingly prominent in green maintenance, leading manufacturers and industry
Andrea Palladini, Lorenzo Guerrini, Marco Fontanelli, Lucia Bortolini   +3 more
wiley   +1 more source

Meander‐Bend Erosion Dynamics Along a Gravel‐Bed River: Insights From Short‐Term UAV Monitoring

River Research and Applications, EarlyView.
ABSTRACT Riverbank erosion is a natural process in meandering rivers that contributes to sediment supply and geomorphic diversity, yet it can threaten infrastructure and human activities within the floodplain. Recently, many studies have used high‐resolution remote sensing technologies to measure bank erosion, but they often focus on technical aspects ...
Katarina Pavlek, Mateo Gašparović, Tomáš Galia   +2 more
wiley   +1 more source