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Evaluation of optical accelerometry for future gravimetry missions

Kupriyanov, Alexey and Reis, Arthur and Schilling, Manuel and Müller, Vitali and Müller, Jürgen (2023) Evaluation of optical accelerometry for future gravimetry missions. 28th IUGG General Assembly, 2023-07-11 - 2023-07-20, Berlin. doi: 10.57757/IUGG23-0260.

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Official URL: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5016208

Abstract

More than 20 years of satellite gravimetry missions have provided unique data about mass redistribution processes in the Earth system. Ongoing climate change underlines the urgent need to continue this kind of measurements with enhanced concepts and sensors. Here, we focus on accelerometers (ACC). Drifts of the electrostatic accelerometers (EA) are one of the limiting factors in the current space gravimetry missions dominating the error contribution at low frequencies. The focus of this study is on the modelling of enhanced EAs with laser-interferometric readout, so called 'optical accelerometers' and evaluating their performance at Low Earth Orbit (LEO). Contrary to present-day EAs, which measure capacitively the TM displacement and actuate it electrostatically, optical ACC, beside a similar actuation scheme, track the TM with laser interferometry. Our research is based on promising results of the mission LISA-Pathfinder which demonstrated the benefit of using a drag-free system in combination with optical accelerometry and UV TM discharge which allowed sensing of non-gravitational accelerations several orders of magnitude more accurate than it is realized in current gravity missions. In this presentation, we now introduce a framework for modeling novel EA with laser-interferometric readout mainly developed by IGP including major noise sources, like actuation noise, capacitive sensing, etc. Also, parametrization of the developed ACC model will be discussed including different TM weights and TM-electrode housing gaps. Finally, improved results of the recovered gravity field will be shown for various mission scenarios applying optical accelerometry and gradiometry. This project is funded by: Deutsche Forschungsgemeinschaft (DFG) - Project-ID 434617780-SFB 1464.

Item URL in elib:https://elib.dlr.de/196310/
Document Type:Conference or Workshop Item (Speech)
Title:Evaluation of optical accelerometry for future gravimetry missions
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Kupriyanov, AlexeyInstitut für Erdmessung, Leibniz Universität Hannover, Germanyhttps://orcid.org/0000-0002-0743-5889UNSPECIFIED
Reis, ArthurMax Planck Institute for Gravitational Physics, Hannoverhttps://orcid.org/0000-0002-6682-5457UNSPECIFIED
Schilling, ManuelUNSPECIFIEDhttps://orcid.org/0000-0002-9677-0119UNSPECIFIED
Müller, VitaliMax-Planck-Institut für Gravitationsphysik, HannoverUNSPECIFIEDUNSPECIFIED
Müller, JürgenInstitut für Erdmessung, Leibniz Universität Hannoverhttps://orcid.org/0000-0003-1247-9525UNSPECIFIED
Date:2023
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
DOI:10.57757/IUGG23-0260
Status:Published
Keywords:Geodäsie, Schwerefeld, Beschleunigungsmesser, Satellitenmission
Event Title:28th IUGG General Assembly
Event Location:Berlin
Event Type:international Conference
Event Start Date:11 July 2023
Event End Date:20 July 2023
Organizer:International Union of Geodesy and Geophysics (IUGG)
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Communication, Navigation, Quantum Technology
DLR - Research area:Raumfahrt
DLR - Program:R KNQ - Communication, Navigation, Quantum Technology
DLR - Research theme (Project):R - Inertial Sensing for Space Applications
Location: Hannover
Institutes and Institutions:Institute for Satellite Geodesy and Inertial Sensing > Satellite Geodesy and Geodetic Modelling
Deposited By: Schilling, Manuel
Deposited On:18 Aug 2023 12:00
Last Modified:24 Apr 2024 20:56

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