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Estimation of Earth Rotation Parameter UT from Lunar Laser Ranging Observations

Biskupek, Liliane and Singh, Vishwa Vijay and Müller, Jürgen (2021) Estimation of Earth Rotation Parameter UT from Lunar Laser Ranging Observations. Scientific Assembly of the International Association of Geodesy, 28. Juni - 2. Juli 2021, Beijing, China (online).

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Abstract

Since 1969, Lunar Laser Ranging (LLR) data have been collected by different observatories and analysed by different analysis groups. In recent years, observations have been made with larger telescopes (APOLLO) and at infrared wavelengths, resulting in a better distribution of precise LLR data over the lunar orbit and the observed retro-reflectors on the Moon. In Germany, beginning in the early 1980s, the LUNAR software package was developed to study the Earth-Moon system and determine various related model parameters. Our research includes the physical libration and orbit of the Moon, the coordinates of observatories and retroreflectors, and, with special modifications, tests of Einstein´s theory of relativity such as parameters related to the equivalence principle, the time variation of the gravitational constant, and for a selection of PPN (Parametrized Post-Newtonian) parameters. Providing the longest time series of any space geodetic technique for studying the Earth-Moon dynamics, LLR can also support the estimation of Earth Orientation Parameters (EOP), such as UT1. The increased number of high-accuracy LLR observations allows for more accurate determination of EOP compared to previous years. Here, we focus on ∆UT results from different constellations such as single or multi-station results and on results for a different number of normal points per night. The mean uncertainty of the determined corrections to the IERS C04 series are about 18 µs. The findings are discussed in comparison to results from VLBI measurements. The ∆UT results of VLBI can be verified by LLR for selected nights.

Item URL in elib:https://elib.dlr.de/185884/
Document Type:Conference or Workshop Item (Speech)
Additional Information:Publikation aus FuE Vertrag zwischen dem DLR Institut für Satellitengeodäsie und Inertialsensorik und dem Institut für Erdmessung der Leibniz Universität Hannover. Ein Autor wird durch den FuE Vertrag finanziert.
Title:Estimation of Earth Rotation Parameter UT from Lunar Laser Ranging Observations
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Biskupek, LilianeLeibniz Universität Hannoverhttps://orcid.org/0000-0002-4204-6838
Singh, Vishwa VijayIntsitut für Erdmessung Leibniz Universität Hannoverhttps://orcid.org/0000-0003-2973-2435
Müller, JürgenInstitut für Erdmessung, Leibniz Universität Hannover, Germanyhttps://orcid.org/0000-0003-1247-9525
Date:2021
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Lunar Laser Ranging, Moon, Relativitätstheorie, Erdoritierungsparameter
Event Title:Scientific Assembly of the International Association of Geodesy
Event Location:Beijing, China (online)
Event Type:international Conference
Event Dates:28. Juni - 2. Juli 2021
Organizer:International Association of Geodesy
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 - Lunar Laser Ranging
Location: Hannover
Institutes and Institutions:Institute for Satellite Geodesy and Inertial Sensing > Satellite Geodesy and Geodetic Modelling
Deposited By: Schilling, Manuel
Deposited On:07 Apr 2022 09:38
Last Modified:07 Apr 2022 09:38

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