Results 101 to 110 of about 15,182,981 (294)

Analysis of GNSS-R delay and doppler tracking errors

, 2012
The compensation of the delay and Doppler errors using tracking is important to accurately estimate the sea height in spaceborne GNSS-R. This work presents the impacts of the tracking residual errors on the GNSS-R observables, and potential tracking ...
Camps Carmona, Adriano José, Alberto Alonso, Francisco Martin, Carreño Luengo, Hugo, Hyuk Park, Adriano Camps, Hyuk, Park, Hugo Carreno-Luengo, Enric Valencia, Martín Alemany, Francisco, Pascual Biosca, Daniel, Daniel Pascual, Valencia Domènech, Enric, Alonso Arroyo, Alberto   +13 more
core   +1 more source

Robotics for Crop Pollination: Recent Advances and Future Direction

Journal of Field Robotics, EarlyView.
ABSTRACT There is great interest in alternative pollination strategies for crop production in the face of climate change and perennial threats to the traditional pollination mechanisms. This review explores the potential of robotic pollination as a promising solution to these challenges affecting crop fertilization, agricultural sustainability, and ...
Ranjan Sapkota, Matthew D. Whiting, Dawood Ahmed, Manoj Karkee   +3 more
wiley   +1 more source

Potential of Spaceborne GNSS-R for Land Applications

, 2019
Recently Global Navigation Satellite System (GNSS) Reflectometry (GNSS-R) is emerging as an alternative or a complement to classical approaches for Earth remote sensing.
Dente, Laura, Pierdicca, Nazzareno, Costantini, Fabiano, Paloscia, Simonetta, Mollfulleda, Antonio, Zibri, Meherez, Floury, Nicolas, Santi, Emanuele, Carreño-Luengo, Hugo, Cenci, Luca, Clarizia, Maria Paola, Camps, Adriano, Comite, Davide, Park, Hyuk, Guerriero, Leila   +14 more
core   +1 more source

UAV‐Based Precision Seed Dropping for Automated Reforestation

Journal of Field Robotics, EarlyView.
ABSTRACT Wildfires and deforestation pose significant threats to forest ecosystems, motivating scalable methods for reforestation beyond labor‐intensive cultivation of native forest seedlings in nurseries. To enable large‐scale direct seeding of native species, this paper presents the design, analysis, and field evaluation of a UAV‐based seed‐dropping ...
Qi Rui Lee, Henrik Hesse, Khuanphirom Naruangsri, Worayut Takaew, Stephen Elliott, Dinesh Bhatia   +5 more
wiley   +1 more source

Soil moisture retrieval based on LHCP and RHCP GNSS-R signals

, 2015
Soil moisture can be retrieved using radar techniques or L-band microwave radiometry. Recently, Global Navigation Satellite System Reflectometry (GNSS-R) techniques have been demonstrated to be useful for many applications as sea-state retrieval and soil
Savi, Patrizia, Jia, Yan, Notarpietro, Riccardo, Canone, Davide, Pei, Yuekun   +4 more
core  

Evaluating Pose Estimation Uncertainty From Automatic Point Cloud Registration in Multi‐Sensor Robotic Systems

Journal of Field Robotics, EarlyView.
ABSTRACT The poses derived from automatic point cloud registration between stationary laser scans that occur naturally in robotic multi‐sensor systems operating in stop‐and‐go mode have the potential to greatly improve and aid localization and trajectory estimation.
Max Brandstätter, Markus Mikschi, Jelena Gabela, Finn Linzer, Hans Neuner   +4 more
wiley   +1 more source

An SDR-Based GNSS-R CubeSat Payload: Hardware Development and Optimization of the Onboard Processing

IEEE Access
Recent developments in high-performance Software Defined Radios (SDRs) and their utilization in CubeSat payloads are transforming Earth Observation (EO), including Microwave Radiometers, Global Navigation and Satellite System – Radio Occultations (
Shah Zahid Khan, Yasir M. O. Abbas, Edwar Edwar, Abdul-Halim Jallad, Adriano Camps   +4 more
doaj   +1 more source

Using Airborne Laser Scanning and Sentinel‐2 to Understand Subcanopy Light Regimes and Understory Diversity of Vascular Plants in Temperate Mountain Forests

Remote Sensing in Ecology and Conservation, EarlyView.
This study demonstrates that not just Airborne Laser Scanning, but also Sentinel‐2 can effectively estimate absolute canopy cover and canopy cover heterogeneity ‐ structural metrics that determine the subcanopy light regime, found to be linked to the vascular plant species richness in the understory of temperate mountain forests.
Felix Wieland‐Glasmann, Cornelius Senf, Kristin H. Braziunas, Rupert Seidl, Peter Annighöfer   +4 more
wiley   +1 more source

Physics-Constrained Spatio-Temporal Attention FusionGAN: End-to-End Gridded Sea Surface Wind Fusion Over China Seas From Multimission GNSS-R Observations

IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing
To fully exploit the advantages of GNSS-R small satellites (large quantity, short revisit cycle) and address key challenges of multisource GNSS-R data—track-wise distribution, uneven spatial coverage, and observation gaps, this study proposes a ...
Xiaohui Li, Xinhai Han, Jingsong Yang, Feixiong Huang, Jiuke Wang, Guoqi Han, Weiqiang Li   +6 more
doaj   +1 more source

The Application of Autonomous Fixed‐Wing Drones in the Sub‐Antarctic Operating Beyond Visual Line of Sight to Enable Large Area, Multi‐Species Population Monitoring in a Changing Environment

Remote Sensing in Ecology and Conservation, EarlyView.
Autonomous fixed‐wing drones operating beyond visual line of sight of the pilot were used to conduct the first aerial, multi‐species baseline reference survey at the sub‐Antarctic island of South Georgia. Long‐term population monitoring in this remote, challenging environment has historically proved difficult, with terrestrial monitoring generally ...
N. Fenney, J. Coleman, A. Fox, P. N. Trathan, M. A. Collins, P. R. Hollyman   +5 more
wiley   +1 more source