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Article
Estimation of GPS-observed ocean tide loading displacements with an improved harmonic analysis in the northwest European shelf
Global Positioning System technique has been widely used to estimate ocean tide loading displacements, but classical harmonic analysis with satellite modulation typically disregards the effects of hundreds of ...
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Article
Improved estimation of ocean tide loading displacements using multi-GNSS kinematic and static precise point positioning
Multi-GNSS solutions are typically considered to improve GPS-only ocean tide loading (OTL) displacements, as they effectively mitigate the constraints imposed by the single-system GPS orbital configuration on ...
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Article
Improving regional groundwater storage estimates from GRACE and global hydrological models over Tasmania, Australia
Accuracy of groundwater storage (GWS) estimates from the Gravity Recovery and Climate Experiment (GRACE) mission usually has certain relations with hydrological models. This study develops a statistical select...
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Article
Open AccessGRACE gravitational measurements of tsunamis after the 2004, 2010, and 2011 great earthquakes
The 2004 Sumatra, 2010 Maule, and 2011 Tohoku great earthquakes triggered tsunamis as large as a few decimeters over a few 100 km in the open ocean. The transient ocean mass redistribution propagating as tsuna...
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Article
Open AccessLand cover change explains the increasing discharge of the Paraná River
Over the past 40 years, the discharge in South America’s Paraná River basin has increased despite no evidence of significant rainfall increases in the basin. In this analysis, we show that the observed multi-d...
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Article
Validation of international reference ionosphere models using in situ measurements from GRACE K-band ranging system and CHAMP planar Langmuir probe
The in situ measurements of electron contents from GRACE K-band (dual-frequency) ranging system and CHAMP planar Langmuir probe were used to validate the international reference ionosphere (IRI) models. The co...
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Chapter
Satellite Observations Defying the Long-Held Tsunami Genesis Theory
Using seismographs and GPS displacement measurements, we have estimated the seafloor deformation history of the December 2004 Sumatra-Andaman earthquake and the March 2005 Nias earthquake by separating their d...
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Article
One centimeter-level observations of diurnal ocean tides from global monthly mean time-variable gravity fields
A method of analyzing GRACE satellite-to-satellite ranging data is presented which accentuates signals from diurnal ocean tides and dampens signals from long-period non-tidal phenomena. We form a time series o...
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Article
Localized spectral analysis of global satellite gravity fields for recovering time-variable mass redistributions
A spatiospectral localization method is discussed for processing the global geopotential coefficients from satellite mission data to investigate time-variable gravity. The time-variable mass variation signal u...
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Article
Regional gravity modeling in terms of spherical base functions
This article provides a survey on modern methods of regional gravity field modeling on the sphere. Starting with the classical theory of spherical harmonics, we outline the transition towards space-localizing ...
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Chapter
Regional Geoid Undulations from CHAMP, Represented by Locally Supported Basis Functions
Regional geoid undulations are determined from CHAMP data using various locally supported basis functions to assess their respective efficiency, accuracy and multi-resolution representation properties. These f...
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Chapter
CHAMP Gravity Field Solutions and Geophysical Constraint Studies
We report results on the use of CHAMP observations for Earth's mean and time-varying gravity field solutions and the associated geophysical interpretation. 1.5 years of CHAMP data from May 2001 through Februar...
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Chapter
Recovery of Isostatic Topography over North America from Topographic and CHAMP Gravity Correlations
We investigate North American crustal structure and mass loads from spectral correlation analysis of topographic, CHAMP and terrestrial gravity data. We use free-air and terrain gravity correlations to isolate...
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Article
Efficient Determination of Global Gravity Field from Satellite-to-satellite Tracking Mission
The gravity field dedicated satellite missions like CHAMP, GRACE, and GOCE are supposed to map the Earth's global gravity field with unprecedented accuracy and resolution. New models of the Earth's static and ...
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Chapter
CHAMP Gravity Anomalies over Antarctica
Before CHAMP, the Antarctic gravity field was constrained predominantly by satellite altimetry-derived gravity measurements over the oceans and the variations in satellite orbits at altitudes of about 700 km a...
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Chapter and Conference Paper
Absolute kinematic GPS positioning using satellite clock estimation every 1 second
An algorithm for absolute positioning through satellite clock estimation has been developed. Using IGS precise orbits and measurements, the GPS clock errors were estimated at 30-second intervals and these esti...
