Results 11 to 20 of about 150 (111)

Prediction of Polar Motion and UT1-UTC Based on the Hybrid EEMD_LSTM Model

Geo-Spatial Information Science
Accurate and real-time Earth rotation parameters (ERPs) are crucial for various scientific fields, including astronomy, geoscience, and oceanography.
Wenbin Shen, Pengfei Zhang, Jiayao Wang
exaly   +4 more sources

Evaluating the Potential of Indian Stations in Augmenting the UT1−UTC Precision of VGOS Intensive Sessions

Earth, Planets and Space
Irregularities in the Earth’s rotation speed are quantified by the difference between Universal Time (UT1) and Coordinated Universal Time (UTC).
Hana Krásná, Arnab Laha, Benedikt Soja
exaly   +4 more sources

Improved LOD and UT1-UTC Prediction Using Least Squares Combined With Polynomial CURVE Fitting

Remote Sensing
The Length of Day (LOD) and the Universal Time (UT1) play crucial roles in satellite positioning, deep space exploration, and related fields. The primary method for predicting LOD and UT1 is least squares fitting combined with autoregressive (AR) models.
Xuhai Yang, Yuanwei Wu, Xishun Li
exaly   +5 more sources

Evaluation of selected short-term predictions of UT1-UTC and LOD collected in the second earth orientation parameters prediction comparison campaign

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, Henryk Dobslaw, Justyna Śliwińska, Jolanta Nastula, Małgorzata Wińska, Aleksander Partyka   +5 more
doaj   +4 more sources

Investigating a continental Australian VGOS VLBI intensive for UT1-UTC determination

Earth, Planets and Space
In 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, Lucia McCallum, Matthias Schartner   +2 more
doaj   +3 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, Kern L, Nothnagel A, Böhm J, Soja B.   +4 more
europepmc   +5 more sources

Short-term prediction of UT1-UTC and LOD via Dynamic Mode Decomposition and combination of least-squares and vector autoregressive model

Reports on Geodesy and Geoinformatics
This 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

Combining evolutionary computation with machine learning technique for improved short-term prediction of UT1-UTC and length-of-day

Earth, Planets and Space
Over 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, Robert Heinkelmann, Santiago Belda, Sadegh Modiri, Harald Schuh, Sonia Guessoum, José Manuel Ferrándiz, Nagarajan Balasubramanian, Onkar Dikshit   +8 more
doaj   +4 more sources

Variation in the rotation rate of Earth and its role as a climate change indicator between 1972 and 2022

地球与行星物理论评, 2023
The universal time (UT1-UTC) and length of day change (ΔLOD) are two parameters that describe the Earth's rotation rate variations. UT1-UTC is typically used in space projects, whereas ΔLOD is used for scientific investigations.
Xueqing Xu, Yonghong Zhou, Cancan Xu
doaj   +1 more source

A Simulation Study for Future Geodetic Satellites Tracked by Satellite Laser Ranging

Journal of Geophysical Research: Solid Earth, Volume 128, Issue 12, December 2023., 2023
Abstract Satellite laser ranging (SLR) measurements play a key role in determining global geodetic parameters, such as station coordinates, geocenter motion, low‐degree Earth's gravity field parameters, and Earth rotation parameters. Observations to two LAser GEOdynamics Satellites (LAGEOS) and two Etalon satellites provide operational standard ...
Joanna Najder, Krzysztof Sośnica, Dariusz Strugarek, Radosław Zajdel   +3 more
wiley   +1 more source