Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 19 of 19 for “"Gravity recovery"”.
-
Dual Quaternions for Gravity Recovery Missions
… methods which are currently utilized for gravity recovery missions. The proposed modeling and control approach was verified against and compared to the tangent bundle to Special Euclidean Group 3 through MATLAB simulations. The dual quaternion-based approach shows superior performance over …
-
Investigation of the effect of repeat orbits on GRACE gravity recovery
The Gravity Recovery and Climate Experiment (GRACE) has been orbiting the Earth and determining its gravity field since 2002. Throughout the course of the mission, the orbital elements occasionally change such that the satellites enter a repeat ground track configuration. Repeat ground tracks …
-
Judging a planet by its cover : insights into lunar crustal structure and Martian climate history from surface features
… climatic history of Mars. In chapter 2, I use gravity data from the Gravity Recovery and Interior Laboratory (GRAIL) mission to constrain the quantity and location of hidden volcanic deposits on the Moon. In chapter 3, I combine GRAIL data with elevation measurements from the Lunar Orbiter …
-
Geophysical insights into the histories of Venus, Mercury and the Moon
Gravity and topography data provide a powerful tool for studying the interiors of rocky planetary bodies. In this thesis I study three such bodies - Venus, Mercury and the Moon - and I use the gravity and topography data returned by recent NASA planetary science missions to model their structure …
-
Positioning in geophysics : applications to GPS seismology, airborne gravimetry, and the Dawn Spacecraft at Vesta
… to seismology, airborne gravimetry and planetary gravity recovery. In Chapters 2 and 3, a smoothed ionospheric model computed using GPS phase observations was applied to seismology and airborne gravimetry. The seismic investigation observed the 2010 El Mayor-Cucapah earthquake near Baja, …
-
Analyzing and monitoring GRACE-FO star camera performance in a changing environment
The Gravity Recovery and Climate Experiment Follow-On (GRACE-FO) mission is an Earth-observing pair of satellites whose primary objective is to provide a time-variable map of the Earth's gravity field using inter-satellite ranging, and continue the legacy of the GRACE mission. The main observations …
-
Remote Sensing of 21st Century Water Stress for Hazard Monitoring in California
… stations with water storage anomalies from the Gravity Recovery and Climate Experiment (GRACE) to solve for water storage changes from 2003-2016 over California. Finally, I expand on this joint inversion framework to include poroelastic deformation measured using InSAR over the Central Valley …
-
Determining the ability of terrestrial time-lapse microgravity surveying on a glacier to find summer mass balance using gravitational modeling
… gravimetric methods using data from NASA’s Gravity Recovery and Climate Experiment (GRACE) satellite mission. However, the former can be logistically costly and have large extrapolation errors: measurements taken at monthly temporal scales are expensive and have a spatial resolution of …
-
The New Concept of GRACE Gradiometry and the Unravelling of the Mystery of Stripes
For nearly two decades, the Gravity Recovery and Climate Experiment (GRACE) and GRACE-Follow On (GRACE-FO) missions have been widely used to quantify mass transfers within the Earth. We perform analysis on the on-board measurements, and we find an interesting correlation between space weather …
-
A model of the crust and upper mantle structure of the Hellenic and Cyprus subduction zones constrained by gravity and seismic data
… material on crustal structure, 2.5-D and 3-D gravity models of the Aegean-Anatolian region (24°-33° E and 34°-40° N) have been developed. The gravity model is based on satellite-derived and terrestrial gravity data from the European Improved Gravity Model of the Earth (EIGEN-6C2). The …
-
Zur Ermittlung geophysikalischer Massensignale mit Schwerefeldmissionen: Eine Analyse des gegenwärtigen Standes am Beispiel der Antarktis
… (Challenging Minisatellite Payload), GRACE (Gravity Recovery and Climate Experiment) und GOCE (Gravity Field and Steady-State Ocean Circulation Explorer) können wesentlich zur Erforschung und Beobachtung des Systems Erde beitragen. Die Antarktis als ein Schlüsselglied im globalen Klimasystem …
-
Observações geodésicas multi-sensores aplicadas para caracterização de secas e monitoramento de massa hidrológica
… de combinações de dados temporais da missão Gravity Recovery and Climate Experiment (GRACE) a partir do armazenamento total de água na superfície terrestre (TWS), imagens de sensoriamento remoto do Moderate Resolution Imaging Spectroradiometer (MODIS) a bordo do satélite TERRA a partir do …
-
Remote Sensing Big Data and Physical Models for Resilience to Geohazards in the Water-Energy Nexus
… Synthetic Aperture Radar (InSAR), the Gravity Recovery and Climate Experiment (GRACE and GRACE-FO), and supporting datasets, I examine how water mass redistribution and anthropogenic stress perturbations drive surface deformation and influence seismic processes across three …
-
Calibration of the global hydrological model WGHM with water mass variations from GRACE gravity data
Since the start-up of the GRACE (Gravity Recovery And Climate Experiment) mission in 2002 time dependent global maps of the Earth's gravity field are available to study geophysical and climatologically-driven mass redistributions on the Earth's surface. In particular, GRACE observations of total …
-
Determination and analysis of land deformation in major landslide areas in Kenya using geospatial techniques: A case study of Murang a and Nyeri counties
… processed ALOS PALSAR and Sentinel-1 datasets, Gravity Recovery and Climate Experi-ment (GRACE/GRACE-FO) satellite data, and hydrological modelling data from the Global Land Data Assimilation System (GLDAS), to elucidate and dissect the time series deformation trends prevalent in the study area. …
-
Determination and analysis of land deformation in major landslide areas in Kenya using geospatial techniques: A case study of Murang a and Nyeri counties
… processed ALOS PALSAR and Sentinel-1 datasets, Gravity Recovery and Climate Experi-ment (GRACE/GRACE-FO) satellite data, and hydrological modelling data from the Global Land Data Assimilation System (GLDAS), to elucidate and dissect the time series deformation trends prevalent in the study area. …
-
Highly Physical Solar Radiation Pressure Modeling During Penumbra Transitions
… the simpler SOLAARS-CF model are applied to the Gravity Recovery and Climate Experiment (GRACE) satellites. Modeling results are compared to the sub-nm/s^2 precision GRACE accelerometer data and the results of a traditional penumbra SRP model. These comparisons illustrate the improved accuracy of …
-
Exploring the effects of uncertainty in hydrologic modeling and reconciling spatiotemporal data gaps at the continental scale
… in groundwater (GW) estimates derived from Gravity Recovery and Climate Experiment (GRACE) datasets are explored across the CONUS. Here, we seek to better understand how SW model selection affects GRACE GW uncertainty over the conterminous United States (CONUS) using 50 unique simulations …
-
Exploring the effects of uncertainty in hydrologic modeling and reconciling spatiotemporal data gaps at the continental scale
… in groundwater (GW) estimates derived from Gravity Recovery and Climate Experiment (GRACE) datasets are explored across the CONUS. Here, we seek to better understand how SW model selection affects GRACE GW uncertainty over the conterminous United States (CONUS) using 50 unique simulations …