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Recent improvements to reference frames from Lunar Laser Ranging data analysis

Singh, Vishwa Vijay and Müller, Jürgen and Biskupek, Liliane and Zhang, Mingyue (2022) Recent improvements to reference frames from Lunar Laser Ranging data analysis. 44th COSPAR Scientific Assembly, 2022-07-16 - 2022-07-24, Athen, Griechenland.

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Lunar Laser Ranging (LLR) has been measuring the distance between the Earth and the Moon since 1969. Until the end of 2021, more than 29000 normal points (NPs) are included in our analysis. The LLR analysis procedure is an iteration of the calculation of ephemeris of the solar system followed by the estimation of parameters. The initial orbit of the Moon (Euler angles and angular velocity of the lunar mantle, Euler angles of the lunar core, and the position and the velocity of the selenocenter), amongst many other parameters, is estimated in a standard solution. In our previous standard calculation, the initial orbit of the Moon was estimated for June 28, 1969 and ephemeris was calculated from this time until June 2022. Now, we estimate the initial orbit of the Moon for Jan 1, 2000 to be able to benefit from the higher accuracy of the NPs in the last decade; calculating ephemeris in the forward direction until June 2022 and backwards until June 1969. When comparing the uncertainty obtained from a least-squares adjustment of this study with the previous standard calculation, preliminary results show an improvement of over 50% in the initial position and the initial velocity of the Moon, a deterioration of about 20% in the Euler angles of the mantle and the core, and an improvement of over 15% in the angular velocity of the mantle. Using the new ephemeris, we estimate the benefit of the new highly accurate LLR NPs for the determination of the Earth rotation parameters (terrestrial pole offsets, xp and yp, and Earth rotation phase, deltaUT1). Recent results show the uncertainty of deltaUT1 staying less than 20 µs (to be used for verifying VLBI results independently), less than 2.5 mas for xp, and less than 3 mas for yp for nights selected when at least 15 NPs were observed. Recent results will be presented and major changes would be discussed.

Item URL in elib:https://elib.dlr.de/192793/
Document Type:Conference or Workshop Item (Speech)
Title:Recent improvements to reference frames from Lunar Laser Ranging 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
Müller, JürgenInstitut für Erdmessung, Leibniz Universität Hannoverhttps://orcid.org/0000-0003-1247-9525UNSPECIFIED
Biskupek, LilianeLeibniz Universität Hannoverhttps://orcid.org/0000-0002-4204-6838UNSPECIFIED
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, Referenzrahmen, Ephemeriden
Event Title:44th COSPAR Scientific Assembly
Event Location:Athen, Griechenland
Event Type:international Conference
Event Start Date:16 July 2022
Event End Date:24 July 2022
Organizer:Commitee on Space Research
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 08:27
Last Modified:24 Apr 2024 20:53

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