Results 11 to 20 of about 145 (102)
Impact of Tropospheric Ties on UT1‐UTC in GNSS and VLBI Integrated Solution of Intensive Sessions [PDF]
Journal of Geophysical Research: Solid Earth, 2022 AbstractVery Long Baseline Interferometry (VLBI) intensive (INT) sessions are critical for the rapid determination and densification of Universal Time 1‐Coordinate Universal Time (UT1‐UTC), which plays an important role in satellite geodesy and space exploration missions and is not predictable over longer time scales.
Jungang Wang +2 more
exaly +5 more sources
Optimal VLBI baseline geometry for UT1-UTC Intensive observations. [PDF]
J Geod, 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 ...
Schartner M +4 more
europepmc +5 more sources
Probing a southern hemisphere VLBI Intensive baseline configuration for UT1 determination. [PDF]
Earth Planets 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 ...
Böhm S +8 more
europepmc +2 more sources
Potential of UT1–UTC transfer to the Galileo constellation using onboard VLBI transmitters
Journal of Geodesy, 2022 UT1-UTC is one of the Earth orientation parameters (EOP) that can only be determined by very long baseline interferometry (VLBI), observing distant celestial sources to measure the Earth rotation angle. Earth orbiting satellites tracked from Earth are insensitive to this angle, and the orbit determination and time synchronization (ODTS) procedure for ...
Håkan Sert +2 more
exaly +2 more sources
High frequency variations of Earth Rotation Parameters from GPS and GLONASS observations. [PDF]
Sensors (Basel), 2015 The Earth’s rotation undergoes changes with the influence of geophysical factors, such as Earth’s surface fluid mass redistribution of the atmosphere, ocean and hydrology.
Wei E +5 more
europepmc +2 more sources
Accuracy Analysis of SINS/CNS Integrated Attitude Determination Based on Simplified Spatio-Temporal Model. [PDF]
Sensors (Basel)For ground-based Celestial Navigation System/Strapdown Inertial Navigation System (CNS/SINS) integrated navigation with arcsecond-level accuracy, the current spatio-temporal transformation model involves a considerable amount of astronomical knowledge ...
Ruan C, Li H, Li C, Chen S, Hong Z.
europepmc +2 more sources
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 +3 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
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 +2 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