Results 81 to 90 of about 739,624 (293)

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

Accuracy of WAAS-Enabled GPS-RF Warning Signals When Crossing a Terrestrial Geofence

Sensors, 2016
Geofences are virtual boundaries based on geographic coordinates. When combined with global position system (GPS), or more generally global navigation satellite system (GNSS) transmitters, geofences provide a powerful tool for monitoring the location and
Lindsay M. Grayson, Robert F. Keefe, Wade T. Tinkham, Jan U. H. Eitel, Jarred D. Saralecos, Alistair M. S. Smith, Eloise G. Zimbelman   +6 more
doaj   +1 more source

Estimation and Analysis of the Observable-Specific Code Biases Estimated Using Multi-GNSS Observations and Global Ionospheric Maps

Remote Sensing, 2021
Observable-specific bias (OSB) parameterization allows observation biases belonging to various signal types to be flexibly addressed in the estimation of ionosphere and global navigation satellite system (GNSS) clock products. In this contribution, multi-
Min Li, Yunbin Yuan
doaj   +1 more source

The Texas Spoofing Test Battery: Toward a Standard for Evaluating GPS Signal Authentication Techniques [PDF]

, 2012
A battery of recorded spoofing scenarios has been compiled for evaluating civil Global Positioning System (GPS) signal authentication techniques. The battery can be considered the data component of an evolving standard meant to define the notion of ...
Bhatti, Jahshan A., Humphreys, Todd E., Shepard, Daniel, Wesson, Kyle   +3 more
core   +1 more source

Cascaded Interference and Multipath Suppression Method Using Array Antenna for GNSS Receiver

IEEE Access, 2019
The space-time adaptive processing method has been widely used for both narrowband and wideband interference suppression in GNSS receiver equipped with array antenna. However, the use of space-time filter may cause satellite signal distortion and lead to
Jian Wu, Xiaomei Tang, Zhengrong Li, Cai-hua Li, Feixue Wang   +4 more
semanticscholar   +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

A Software-Defined GNSS Reflectometry Recording Receiver with Wide-Bandwidth, Multi-Band Capability and Digital Beam-Forming

Remote Sensing, 2017
In this paper, we present the Software PARIS Interferometric Receiver (SPIR), a high-speed GNSS reflectometry recording receiver which has been designed and implemented with the primary goal of demonstrating the synoptic capabilities of the ...
Serni Ribó, Juan Carlos Arco-Fernández, Estel Cardellach, Fran Fabra, Weiqiang Li, Oleguer Nogués-Correig, Antonio Rius, Manuel Martín-Neira   +7 more
doaj   +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

Analysis of the Effect of Time Delay on the Integrated GNSS/INS Navigation Systems [PDF]

TransNav, 2013
The performance of tightly coupled GNSS/INS integration is known to be better than that of loosely coupled GNSS/INS integration. However, if the time synchronization error occurs between the GNSS receiver and INS(Inertial Navigation System), the ...
Choel-Kwan Yang, Duk-Sun Shim
doaj   +1 more source

Wide-Area GNSS Corrections for Precise Positioning and Navigation in Agriculture

Remote Sensing, 2022
This paper characterizes, with static and roving GNSS receivers in the context of precision agriculture research, the hybrid ionospheric-geodetic GNSS model Wide-Area Real-Time Kinematics (WARTK), which computes and broadcasts real-time corrections for ...
Manuel Hernández-Pajares, Germán Olivares-Pulido, Victoria Graffigna, Alberto García-Rigo, Haixia Lyu, David Roma-Dollase, M. Clara de Lacy, Carles Fernández-Prades, Javier Arribas, Marc Majoral, Zizis Tisropoulos, Panagiotis Stamatelopoulos, Machi Symeonidou, Michael Schmidt, Andreas Goss, Eren Erdogan, Frits K. van Evert, Pieter M. Blok, Juan Grosso, Emiliano Spaltro, Jacobo Domínguez, Esther López, Alina Hriscu   +22 more
doaj   +1 more source