Results 71 to 80 of about 72,223 (218)

Evaluating SWOT in the Coastal Zone: Comparisons With Tide Gauge and Airborne LiDAR in the Bristol Channel and Severn Estuary, UK

Geophysical Research Letters, Volume 53, Issue 2, 28 January 2026.
Abstract Traditional nadir altimeters struggle with coastal water surface elevation (WSE) measurement and fine‐scale river‐estuary interactions, due to land‐water signal interference and their wide inter‐track spacing. The wide‐swath Surface Water and Ocean Topography (SWOT) mission, using a new Ka‐band radar interferometer, aims to address these ...
Youtong Rong, Paul Bates, Jeff Neal, Paul Bell, Christine Gommenginger, Ian Dougal Lichtman, Christopher Banks, Francisco J. M. Calafat, Adrien Martin, Jennifer Brown, Richard Cooke, Christopher Balfour, Michela De Dominicis, Marta Payo Payo, Simon Williams, Laurent Amoudry, Stephen Chuter, Simon Neill, Jude Chisholm, Colin J. Gleason, John Kupiec, Matt Lewis   +21 more
wiley   +1 more source

Leveraging the CYGNSS Spaceborne GNSS‐R Observations to Detect Ionospheric Irregularities Over the Oceans: Method and Verification

Space Weather, 2022
The Global Navigation Satellite System (GNSS) has significantly facilitated the detection of ionospheric irregularities. Nevertheless, the ground‐based GNSS stations are inhomogeneously distributed around the world with large gaps, especially in the vast
Xiaodong Ren, Hang Liu, Dengkui Mei, Pengxin Yang, Zhiyu Zhang, Mohamed Freeshah, Xiaohong Zhang   +6 more
doaj   +1 more source

TGCAT—A Tool to Analyse the Content of Sea Level Data Portals

Geoscience Data Journal, Volume 13, Issue 1, January 2026.
TGCAT is an online tool (www.sonel.org/tgcat) to help sea level data providers, data aggregators, and data users to visualise available tide gauge datasets. It is aimed to improve data referencing and discoverability in the global tide gauge data centres. The code has been fully developed in Python and is open‐source.
Laurent Testut, Adrien Laval, Clémence Chupin, Mikaël Guichard, Begoña Pérez Gómez   +4 more
wiley   +1 more source

GNSS Reflectometry-Based Ocean Altimetry: State of the Art and Future Trends

Remote Sensing
For the past 20 years, Global Navigation Satellite System reflectometry (GNSS-R) technology has successfully shown its potential for remote sensing of the Earth’s surface, including ocean and land surfaces.
Tianhe Xu, Nazi Wang, Yunqiao He, Yunwei Li, Xinyue Meng, Fan Gao, Ernesto Lopez-Baeza   +6 more
doaj   +1 more source

A Modified Hierarchical Vision Transformer for Soil Moisture Retrieval From CYGNSS Data

Water Resources Research, Volume 62, Issue 1, January 2026.
Abstract This research introduces a new deep learning (DL) framework, multi‐head self‐attention‐aided vision Transformer (MSA‐ViT), for soil moisture (SM) retrieval using Cyclone Global Navigation Satellite System (CYGNSS) data. We first assess the sensitivity of CYGNSS reflectivity (Γ) $({\Gamma })$ to SM, demonstrating a strong physical linkage ...
Qingyun Yan, Yuhan Chen, Yuanjin Pan, Shuanggen Jin, Weimin Huang   +4 more
wiley   +1 more source

Can GNSS reflectometry detect precipitation over oceans? [PDF]

, 2020
For the first time, a rain signature in Global Navigation Satellite System Reflectometry (GNSS‐R) observations is demonstrated. Based on the argument that the forward quasi‐specular scattering relies upon surface gravity waves with lengths larger than ...
Zavorotny, Valery, Wickert, Jens, Reich, Sebastian, Asgarimehr, Milad   +3 more
core   +1 more source

A Unified Optimization Framework for LEO Hybrid Constellations Using an Improved Continuous Coefficient Method

Advances in Astronomy, Volume 2026, Issue 1, 2026.
Low Earth orbit (LEO) constellations are increasingly deployed to provide integrated services such as communication, navigation augmentation, and remote sensing. However, traditional constellation designs—such as Walker, streets‐of‐coverage (SoC), and Flower constellations—rely on distinct parameter sets, making unified optimization of hybrid ...
Lin Pan, Lan Du, Zhongkai Zhang, Lundong Zhang, Zejun Liu, Peiyuan Zhou, Chonghui Li, Jianguo Yan   +7 more
wiley   +1 more source

GNSS Satellite Orbit Validation Using Satellite Laser Ranging [PDF]

, 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  

Analysis of GNSS Interference Events Based on TRITON GNSS-R Measurements

Navigation
Although the issue of global navigation satellite system (GNSS) interference has been addressed in the community of satellite navigation, the extent of GNSS interference in the past couple of years has raised serious concerns for air and marine ...
Jyh-Ching Juang, Yung-Fu Tsai
doaj   +1 more source

What's Next for Snow: Insights From the NASA Terrestrial Hydrology Program Community Snow Meeting

Earth's Future, Volume 13, Issue 12, December 2025.
Abstract Earth's snow cover strongly influences the climate system and represents an important resource for agricultural, industrial, and domestic water use. The last decade of snow‐focused research has improved our understanding of snow across scales. These efforts have culminated in new snow measurement instruments and methods, operational models for
Kate Hale, Joachim Meyer, Jack Tarricone, Carrie Vuyovich, Megan Mason, Hans‐Peter Marshall, Keith N. Musselman, Noah P. Molotch, Rashmi Shah, Shadi Oveisgharan   +9 more
wiley   +1 more source