Call number:
S 99.0139(391)
In:
Wissenschaftliche Arbeiten der Fachrichtung Geodäsie und Geoinformatik der Leibniz Universität Hannover, Nr. 391
Description / Table of Contents:
The Earth’s gravity field and its temporal variation reveal important information for many
disciplines, especially for geosciences. Satellite gravity missions like GOCE, GRACE and
GRACE-FO successfully recovered global gravity field models. But the temporal and spa-
tial resolution of the gravity field solutions have to be improved in order to meet the user
requirements. New concepts for future satellite missions to recover the global gravity field
are investigated by means of comprehensive simulations. In terms of sensor behavior, ac-
celerometers are one major limiting factor. Thus, this dissertation focuses on them. Cold
Atom Interferometry (CAI) accelerometers are promising candidates for future missions due
to their long-term stability.
Type of Medium:
Series available for loan
Pages:
vi, 161 Seiten
,
Illustrationen, Diagramme
ISBN:
978-3-7696-5328-1
,
9783769653281
ISSN:
0174-1454
Series Statement:
Wissenschaftliche Arbeiten der Fachrichtung Geodäsie und Geoinformatik der Leibniz Universität Hannover Nr. 391
Language:
English
Note:
Contents
1 Introduction
2 Satellite Gravity Missions
2.1 Fundamentals of Gravity Field Recovery with Satellites
2.1.1 Motion of a Satellite in Space
2.1.2 Representation of the Earth’s Gravity Field
2.1.3 Orbit Design of Satellite Gravity Missions
2.2 Previous Satellite Gravity Missions
2.2.1 Missions and Measurement Concepts
2.2.2 State-of-the-art Sensors
2.2.3 State-of-the-art Control Systems
2.2.4 State-of-the-art Accelerometer Calibration
2.3 Concepts for Future Satellite Gravity Missions
2.3.1 Challenges of Satellite Gravity Missions and Requirements for Future Satellite Missions
2.3.2 Developments in the Sensor Technology
2.3.3 Concepts for Orbit Design
3 Evaluation of Simulation Environment
3.1 Overview of the Simulation Environment
3.2 Modeling of Non-gravitational Forces
3.3 Modeling of the Sensor Behavior
3.3.1 Classical Electrostatic Accelerometer
3.3.2 Cold Atom Interferometry Accelerometer
3.3.3 Ranging Measurement Instruments
3.4 Modeling of Control System Behavior
3.4.1 Drag-free Control
3.4.2 Attitude Control
3.5 Time-variable Background Modeling Errors
3.6 Gravity Field Recovery
3.6.1 Least-squares Adjustment
3.6.2 Range Accelerations
3.6.3 Gradiometry
3.6.4 Combination of Range Accelerations and Gravity Gradients
3.7 Summary
4 Impact of New Measurement Concepts on Gravity Field Recovery
4.1 Selection of Simulation Scenarios
4.2 Drag Compensation Analysis
4.2.1 Drag Compensation Requirements due to Accelerometer Imperfections for ll-SST Missions
4.2.2 Drag Compensation Requirements for Gradiometry due to Accelerometer Imperfections
4.2.3 Saturation of the Accelerometer
4.2.4 Propellant Consumption
4.3 Cold Atom Interferometry Accelerometer Analysis
4.4 Gravity Field Solutions using Different Accelerometer Types for ll-SST Missions
4.5 Gravity Field Solutions using Different Accelerometer Types for Gradiometry Missions
4.6 Combined Gravity Field Solutions from ll-SST and Cross-track Gradiometry
4.7 Summary
5 Summary and Outlook
A Appendix
A.1 Reference Frames
A.2 Satellite Reference Attitudes for Attitude Control
A.3 Simulation results - Gravity Field Solutions for ll-SST Missions
A.3.1 Instrument-only scenarios
A.3.2 Scenarios including AOD and Ocean-tide Error
A.4 Simulation results - Combined Gravity Field Solutions from ll-SST and Crosstrack Gradiometry
Bibliography
List of Figures
List of Tables
Acronyms
Acknowledgments
Location:
Lower compact magazine
Branch Library:
GFZ Library
