Results 91 to 100 of about 739,624 (293)

Search and Passage Are Decoupled for Migrating Trout Kelts at Multi‐Exit Dam

River Research and Applications, EarlyView.
ABSTRACT Longitudinal and lateral river connectivity have been drastically reduced over time, with hydropower development as a major driver of fragmentation. While fishways are widely implemented to support upstream migration, downstream passage remains a major challenge.
Halvor Kjærås, Jon Museth, Finn Økland, Karl Øystein Gjelland, Henrik Baktoft, Torbjørn Forseth   +5 more
wiley   +1 more source

Software receiver design for GNSS-R using multiple GNSS satellites as transmitters

The Journal of Engineering, 2019
A novel global navigation satellite system-reflectometry (GNSS-R) software receiver and its preliminary experimental results are presented in this study.
Shuzhu Shi, Shiwei Wang, Tao Li
doaj   +1 more source

Authentication of Satellite Navigation Signals by Wiretap Coding and Artificial Noise

, 2018
In order to combat the spoofing of global navigation satellite system (GNSS) signals we propose a novel approach for satellite signal authentication based on information-theoretic security.
Formaggio, Francesco, Tomasin, Stefano
core   +1 more source

Wind direction signatures in GNSS-R observables from space [PDF]

, 2018
Peer ReviewedPostprint (published ...
Camps Carmona, Adriano José, Guan, Dongliang, Hyuk, Park, Onrubia Ibáñez, Raúl, Pascual Biosca, Daniel, Querol Borràs, Jorge, Wang, Yong   +6 more
core   +2 more sources

On the compatibility of single‐scan terrestrial LiDAR with digital photogrammetry and field inventory metrics of vegetation structure in forest and agroforestry landscapes

Remote Sensing in Ecology and Conservation, EarlyView.
The single‐scan approach to terrestrial laser scanning (TLS) and the self‐terrain‐normalized form of drone‐based digital aerial photogrammetry (DAP) offer practical options for rapid assessment of the vegetation structure in tropical landscapes.
Magnus Onyiriagwu, Nereoh Leley, Caleb W. T. Ngaba, Anthony Macharia, Henry Muchiri, Abdalla Kisiwa, Martin Ehbrecht, Delphine Clara Zemp   +7 more
wiley   +1 more source

Time Synchronization of TESLA-Enabled GNSS Receivers

IEEE Transactions on Aerospace and Electronic Systems
16 pages, 15 ...
Jason Anderson, Sherman C. Lo, Todd Walter   +2 more
openaire   +2 more sources

Semi‐automated seal detection on the Western Antarctic Peninsula: an unsupervised machine learning approach for detecting ice seals in aerial survey data

Remote Sensing in Ecology and Conservation, EarlyView.
This study presents a semi‐automated, rule‐based image analysis pipeline to detect ice seals in aerial surveys of the Western Antarctic Peninsula during an unusually low sea ice year. By using simple hierarchical clustering instead of deep learning, the method substantially reduced human annotation effort while achieving 82% recall, identifying 758 ...
Claire McGinnity, Connor C.G. Bamford, Nathan Fenney, Andrew Fleming, Jaume Forcada, Michael S. Tift, Luis A. Hückstädt, Daniel P. Costa, Peter T. Fretwell   +8 more
wiley   +1 more source

Tracing Three Decades of Low Earth Orbit Satellite Communication Development: A Bibliometric and Main Path Analysis of Network Architectures, Protocol Evolution, and Emerging Intelligent Services

International Journal of Satellite Communications and Networking, EarlyView.
ABSTRACT Low Earth Orbit (LEO) satellite communication systems have evolved into a critical component of global broadband networks, enabling wide‐area connectivity, IoT services, and intelligent multilayer satellite–terrestrial integration. Despite rapid advancements in constellation deployment, routing mechanisms, resource management, and LEO–5G/6G ...
Wei‐Hao Su, Ya‐Chen Chuang, Long‐Sheng Chen   +2 more
wiley   +1 more source

Perbandingan Ketelitian Posisi Tiga Dimensi dari Perangkat Lunak Pengolahan Data GNSS Komersial

Journal of Geospatial Information Science and Engineering, 2020
Pasar receiver GNSS di Indonesia sudah semakin berkembang dan bergerak ke arah positif, yang ditandai dengan penjualan yang semakin meningkat serta semakin beragamnya merk receiver GNSS dan perangkat lunak pengolahan data yang ada di pasaran.
Syafril Ramadhon, Wahyu Widiat Miko, Gian Nugraha   +2 more
doaj   +1 more source

Influence of Doppler Bin Width on GPS Acquisition Probabilities

, 2013
Acquisition is a search in two continuous dimensions, where the digital algorithms require a partitioning of the search space into cells. Depending on the partitioning of the Doppler frequency domain, more than one cell might contain significant signal ...
Geiger, Bernhard C., Vogel, Christian
core   +1 more source