Results 81 to 90 of about 3,815 (246)

The Impact of Inter-Modulation Components on Interferometric GNSS-Reflectometry [PDF]

, 2016
The interferometric Global Navigation Satellite System Reflectometry (iGNSS-R) exploits the full spectrum of the transmitted GNSS signal to improve the ranging performance for sea surface height applications.
Cardellach, Estel, Fabra Cervellera, Fran, Li, Weiqiang, Martín-Neira, Manuel, Ribó, Serni, Rius, Antonio, Yang, Dongkai   +6 more
core   +2 more sources

Evaluating Water Levels From the Surface Water and Ocean Topography (SWOT) Mission in a Hyper‐Tidal Coastal and Estuarine Environment

Earth and Space Science, Volume 12, Issue 7, July 2025.
Abstract The launch of the Surface Water and Ocean Topography (SWOT) satellite in December 2022 started a new era of swath altimetry, introducing an unprecedented global data set of high‐resolution two‐dimensional water level imagery. During its initial calibration and validation phase (cal/val), SWOT conducted daily observations for 3 months providing
I. D. Lichtman, P. S. Bell, C. Gommenginger, C. Banks, F. M. Calafat, J. Brown, S. D. P. Williams   +6 more
wiley   +1 more source

One‐Hundred Fundamental, Open Questions to Integrate Methodological Approaches in Lake Ice Research

Water Resources Research, Volume 61, Issue 5, May 2025.
Abstract The rate of technological innovation within aquatic sciences outpaces the collective ability of individual scientists within the field to make appropriate use of those technologies. The process of in situ lake sampling remains the primary choice to comprehensively understand an aquatic ecosystem at local scales; however, the impact of climate ...
Joshua Culpepper, Sapna Sharma, Grant Gunn, Madeline R. Magee, Michael F. Meyer, Eric J. Anderson, Chris Arp, Sarah W. Cooley, Wayana Dolan, Hilary A. Dugan, Claude R. Duguay, Benjamin M. Jones, Georgiy Kirillin, Robert Ladwig, Matti Leppäranta, Di Long, John J. Magnuson, Tamlin Pavelsky, Sebastiano Piccolroaz, Dale M. Robertson, Bethel G. Steele, Manu Tom, Gesa A. Weyhenmeyer, R. Iestyn Woolway, Marguerite A. Xenopoulos, Xiao Yang   +25 more
wiley   +1 more source

The Eddy Experiment: accurate GNSS-R ocean altimetry from low altitude aircraft

, 2004
During the Eddy Experiment, two synchronous GPS receivers were flown at 1 km altitude to collect L1 signals and their reflections from the sea surface for assessment of altimetric precision and accuracy.
Elfouhaily, F. Soulat, G. Ruffini, Lowe, Lowe, M. Caparrini, M. Martín-Neira, Martín-Neira, O. Germain, Picardi, Rius, Ruffini, Zavorotny   +12 more
core   +1 more source

Ground-based GNSS-R solutions by means of software defined radio [PDF]

, 2016
Usually ground-based GNSS-R installations are either existing geodetic GNSS stations or they are built with dedicated components that enable the deduction and monitoring of physical and geometrical properties of the reflecting area around that particular
Haas, Rüdiger, Hobiger, Thomas, Strandberg, Joakim   +2 more
core   +1 more source

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

Feasibility Demonstration of Using the Signal‐to‐Noise Ratio Observations From Geodetic GNSS Receivers to Retrieve Dry Snow Density

Water Resources Research, Volume 61, Issue 4, April 2025.
Abstract The geodetic Global Navigation Satellite System (GNSS) receiver has been proven to retrieve snow depth using the phase change rate of the signal‐to‐noise ratio (SNR) observations. Snow density can be related to snow permittivity and is theoretically sensitive to the amplitude of the GNSS reflected signal. However, retrieving snow density using
J. Zhang, W. Wan, H. Liang, W. Ma, B. Liu, C. Liang, Z. Guo, X. Wan   +7 more
wiley   +1 more source

Innovative and Cost‐Effective Approaches to the Measurement of Sediment Levels in Small Water Reservoirs

Land Degradation &Development, Volume 36, Issue 1, Page 28-38, 15 January 2025.
ABSTRACT Sedimentation in small water reservoirs poses a critical challenge with significant environmental, economic, and social implications. To address this issue, this study will employ three measurement techniques—GNSS RTK Trimble R8s, Echolot HDS LIVE 7 with Active Imaging 3‐in‐1, and the Mivardi Carp Scout bait boat—to assess sediment levels in ...
Stanislav Paseka
wiley   +1 more source

Sea state monitoring using coastal GNSS-R

, 2004
We report on a coastal experiment to study GPS L1 reflections. The campaign was carried out at the Barcelona Port breaker and dedicated to the development of sea-state retrieval algorithms.
Elfouhaily, F. Soulat, G. Ruffini, M. Caparrini, M. Taani, Martín-Neira, O. Germain, P. Lopez-Dekker, Ruffini, Zavorotny   +9 more
core   +2 more sources

Feasibility of GNSS-R ice sheet altimetry in Greenland using TDS-1 [PDF]

, 2017
Radar altimetry provides valuable measurements to characterize the state and the evolution of the ice sheet cover of Antartica and Greenland. Global Navigation Satellite System Reflectometry (GNSS-R) has the potential to complement the dedicated radar ...
Cardellach, Estel, Fabra, Fran, Hernández Pajares, Manuel, Li, Weiqiang, Ribó Vedrilla, Serni, Rius, Antonio   +5 more
core   +2 more sources