Results 11 to 20 of about 137,331 (82)
Earth, Planets and SpaceIrregularities in the Earth’s rotation speed are quantified by the difference between Universal Time (UT1) and Coordinated Universal Time (UTC).
Arnab Laha +6 more
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Investigating a continental Australian VGOS VLBI intensive for UT1-UTC determination
Earth, Planets and SpaceIn this simulation study, we investigate the potential performance of VLBI Intensives using the AuScope 12-metre VLBI network. This continental Australian network consisting of three stations, has recently been fully upgraded with VGOS receivers and has ...
Tiege McCarthy +2 more
doaj +4 more sources
VGOS VLBI Intensives Between macgo12m and wettz13s for the Rapid Determination of UT1-UTC [PDF]
International Association of Geodesy Symposia, 2023 AbstractIn this work, we present a status update and preliminary results of the designated research and development VLBI Intensive program VGOS-INT-S, observed between macgo12m and wettz13s for the rapid determination of the Earth’s phase of rotation, expressed via UT1-UTC.
Matthias Schartner +2 more
exaly +4 more sources
Reports on Geodesy and GeoinformaticsThis study presents a short-term forecast of UT1-UTC and LOD using two methods, i.e. Dynamic Mode Decomposition (DMD) and combination of Least-Squares and Vector Autoregression (LS+VAR).
Michalczak Maciej, Ligas Marcin
doaj +3 more sources
Probing a southern hemisphere VLBI Intensive baseline configuration for UT1 determination [PDF]
Earth, Planets and Space, 2022 The deviation of Universal Time from atomic time, expressed as UT1−UTC, reflects the irregularities of the Earth rotation speed and is key to precise geodetic applications which depend on the transformation between celestial and terrestrial reference ...
Sigrid Böhm +8 more
doaj +4 more sources
Earth, Planets and Space, 2022 Advanced geodetic and astronomical tasks, such as precise positioning and navigation require forecasted Earth Orientation Parameters (EOP). The Second Earth Orientation Parameters Prediction Comparison Campaign (2nd EOP PCC) aims to compare various EOP ...
Tomasz Kur +5 more
doaj +4 more sources
Polar Coordinates and UT1 — UTC from PZT Observations [PDF]
Symposium - International Astronomical Union, 1979 Use of new techniques (Doppler, laser, VLBI) has yielded such results that many astronomers believe that in the near future these techniques will replace classical instruments for observations of the Earth's rotation. None of the modern techniques has furnished observational series which demonstrate that systematic errors in the polar coordinates and ...
exaly +2 more sources
Impact of erroneous station coordinates on the estimation of UT1-UTC with VLBI Intensive sessions
, 2022 <p>So-called Intensives are one-hour-long VLBI sessions including mostly two stations, which are routinely observed to derive the Earth's phase of rotation expressed through the parameter UT1-UTC. Due to the limitation in time and participating stations, only a few parameters of interest can be estimated during the analysis, whereas ...
Lisa Kern +5 more
openaire +3 more sources
Earth, Planets and SpaceOver the years, prediction techniques for the highly variable angular velocity of the Earth represented by Earth's rotation (UT1-UTC) and length-of-day (LOD) have been continuously improved.
Sujata Dhar +8 more
doaj +5 more sources
Optimal VLBI baseline geometry for UT1-UTC Intensive observations [PDF]
Journal of Geodesy, 2021 AbstractOne of the main tasks of Very Long Baseline Interferometry (VLBI) is the rapid determination of the highly variable Earth’s rotation expressed through the difference between Universal Time UT1 and Coordinated Universal Time UTC (dUT1). For this reason, dedicated one hour, single baseline sessions, called “Intensives”, are observed on a daily ...
Matthias Schartner +4 more
openaire +3 more sources