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Uncertainty determination of Earth Rotation Parameters from LLR by parameter variation during data analysis

Singh, Vishwa Vijay and Biskupek, Liliane and Müller, Jürgen and Zhang, Mingyue (2022) Uncertainty determination of Earth Rotation Parameters from LLR by parameter variation during data analysis. 22nd International Workshop on Laser Ranging, 2022-11-07 - 2022-11-11, Guadalajara, Spanien.

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Lunar Laser Ranging (LLR) has been measuring the distance between the Earth and the Moon since 1969. The IfE LLR dataset includes more than 30,000 normal points (NPs), currently until the end of April 2022. The analysis in the IfE LLR software (LUNAR) follows an iterative adjustment process where each iteration step first calculates the ephemeris of the solar system followed by the estimation of parameters. The adjustment is performed following the Gauß-Markov Model (GMM). In a standard calculation, LUNAR can determine over 175 parameters, and in cases of extension, the Earth rotation parameters (ERP; terrestrial pole offsets, xp and yp, and Earth rotation phase, deltaUT1) can also be estimated. The ERPs are determined for a subset of nights selected, based on the LLR NPs. The standard deviation of all parameters determined from LUNAR (standard calculation and extensions) are determined from the adjustment following the GMM, and the uncertainty of the parameters is reported as 3-sigma values (i.e. three times standard deviation, for a more realistic representation). In this study, we determine the ERPs from LUNAR, creating different modifications to the software to address various cases (for example, by keeping all LLR parameters fixed to standard solution values or adjusting them along with ERPs) and to obtain ERPs from all these different cases. Overall, the different cases provide a range of values for the determined ERPs on each night. Preliminary results show that the range of the deltaUT1 values is in close agreement with the 3-sigma values obtained from the GMM. Recent and more sophisticated results of ERP determination (from LLR) for the different cases will be presented and the different approaches to determine the errors for the standard parameters and the ERPs will be discussed.

Item URL in elib:https://elib.dlr.de/192996/
Document Type:Conference or Workshop Item (Speech)
Title:Uncertainty determination of Earth Rotation Parameters from LLR by parameter variation during data analysis
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Singh, Vishwa VijayInstitut für Erdmessung, Leibniz Universität Hannoverhttps://orcid.org/0000-0003-2973-2435UNSPECIFIED
Biskupek, LilianeLeibniz Universität Hannoverhttps://orcid.org/0000-0002-4204-6838UNSPECIFIED
Müller, JürgenInstitut für Erdmessung, Leibniz Universität Hannover, Germanyhttps://orcid.org/0000-0003-1247-9525UNSPECIFIED
Zhang, MingyueInstitut für Erdmessung, Leibniz Universität Hannoverhttps://orcid.org/0000-0002-2198-1747UNSPECIFIED
Refereed publication:No
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:Lunar Laser Ranging, Erdrotation, Ausgleichung
Event Title:22nd International Workshop on Laser Ranging
Event Location:Guadalajara, Spanien
Event Type:Workshop
Event Start Date:7 November 2022
Event End Date:11 November 2022
Organizer:International Laser Ranging Service (ILRS)
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:06 Jan 2023 08:31
Last Modified:24 Apr 2024 20:54

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