Vishwa Vijay SinghLeibniz Universität Hannover · Institute of Geodesy
Vishwa Vijay Singh
Master of Science
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10
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Publications
Publications (10)
Lunar Laser Ranging (LLR) has been measuring the distance between the Earth and the Moon since 1969, where the measurements are provided by the observatories as Normal Points (NPs). The Institute of Geodesy (IfE) LLR model has (as of April 2021) 28093 NPs. Using the LLR observation equation, the LLR residuals (difference of observed and calculated...
LLR measures the distance between observatories on Earth and retro-reflectors on Moon since 1969. In this paper, we estimate the Earth Rotation Parameters (ERP; terrestrial pole offsets, x_p and y_p, and Earth rotation phase, ΔUT) using LLR data. We estimate the values of ΔUT, and the pole offsets separately. For the pole offsets, we estimate the v...
From 1969 on, Lunar Laser Ranging data are collected by various observatories and analyzed by different analysis groups. In the past years observations with larger telescopes (APOLLO) and at infrared frequencies (OCA, Wettzell) are carried out, which resulted in a better spread of precise LLR data over the lunar orbit and the observed reflectors on...
The distance between the observatories on Earth and the retro-reflectors on the Moon has been regularly observed by the Lunar Laser Ranging (LLR) experiment since 1970. In the recent years, observations with bigger telescopes (APOLLO) and at infra-red wavelength (OCA) are carried out, resulting in a better distribution of precise LLR data over the...
Lunar Laser Ranging (LLR) measures the distance between observatories on Earth and retro-reflectors on Moon since 1970. In this paper, we study the effect of non-tidal station loading (NTSL) in the analysis of LLR data. We add the non-tidal loading effect provided by three data centres: the German Research Centre for Geosciences (GFZ), the Internat...
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 o...
A new lunar laser ranging (LLR) station of JPL at the Table Mountain Observatory can allow a novel way of lunar tracking: differential lunar laser ranging (DLLR). There, fast switching between two or more lunar reflectors would be possible in future to get DLLR observations by differencing two consecutive ranges. This new kind of observable will la...
Lunar Laser Ranging (LLR) measures the distance between observatories on Earth and retro-reflectors on Moon since 1970. In this paper, we study the effect of non-tidal station loading (NTSL) in the analysis of LLR data. We add the non-tidal loading effect provided by three data centres: the German Research Centre for Geosciences (GFZ), the Internat...
The distance between the observatories on Earth and the retro-reflectors on the Moon has been regularly observed by the Lunar Laser Ranging (LLR) experiment since 1970. In this study, we add the effect of non-tidal station loading (NTSL) in the analysis of LLR data. The non-tidal loading datasets provided by the German Research Centre for Geoscienc...
