Preface
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Dirk Behrend et al.
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Preface
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Session 1. Technical Developments at the Stations
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Rolf Dach
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Dependency of Satellite Geodesy on UT1-UTC from VLBI
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Francisco Colomer
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The Global VLBI Alliance
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Juha Kallunki et al.
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Spectrum Management for the VLBI Global Observing System (VGOS) Observations
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Federico Di Vruno and Vincenza Tornatore
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Large Satellite Constellations and Their Potential Impact on VGOS Operations
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Dirk Behrend et al.
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Status of the VGOS Infrastructure Rollout
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Susana Garcia-Espada et al.
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Status at Ny-Ålesund Geodetic Earth Observatory
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Dmitry Ivanov et al.
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Russian New Generation VLBI Network
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João Salmim Ferreira et al.
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RAEGE Santa Maria: Station Overview
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José Antonio López-Pérez et al.
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Description of RAEGE Yebes VGOS Receiver Upgrades
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Nattaporn Thoonsaengngam et al.
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VGOS Station in the South of Thailand
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Saho Matsumoto et al.
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Status of the Ishioka VLBI Station for the Past Two Years
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Alexander Neidhardt et al.
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IVS Seamless Auxiliary Data Archive (SADA) and EVN Monitor
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Sergey Serzhanov et al.
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Modernization of the Subreflector Surface of the RT-32 Radio Telescopes
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Ulla Kallio et al.
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An Agile Method to Detect Deformations of the VLBI Dish
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Hideki Ujihara
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Development of Wideband Antennas
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Gino Tuccari et al.
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From BRAND to DBBC4
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Evgeny Nosov et al.
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Using the Multifunctional Digital Backend System on Radio Telescopes of Svetloe Observatory
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Session 2. Observations, Operation and Correlation
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Ezequiel Albentosa et al.
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Current Status of the EU-VGOS Project
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Ahmad Jaradat et al.
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The Australian VGOS Observing Program
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Javier González et al.
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The Yebes Observatory and the Future VLBI Correlator for the RAEGE Network
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Tiege McCarthy et al.
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Australian VLBI Correlation Center
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Yoon Kyung Choi et al.
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Bonn Correlator Status
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Christian Plötz et al.
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VLBI Correlator Wettzell -- A New IVS Component
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Lim Chin Chuan et al.
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Monitoring Source Flux Density and Antenna Sensitivity with Improved Feedback for the AUSTRAL VLBI Sessions
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Mario Bérubé et al.
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Improving IVS Communication through a VLBI Communications Center
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Jim Lovell and Darryl Lakins
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Towards Automating Operations of SGP VGOS Stations
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Hayo Hase
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Alternative Frequency Setups for VGOS
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Bill Petrachenko et al.
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VGOS Technology R\&D Sessions
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Rebekka Handirk et al.
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Obtaining Local-Tie Vectors from Short-Baseline Interferometry
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Takaaki Jike et al.
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Quality Assessment of the Mizusawa Software and GPU Correlators
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Yuriy Vekshin et al.
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Optimal Signal Averaging Time in VLBI Sessions
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Anastasiia Girdiuk et al.
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IVS Data Center at BKG
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Taylor Yates et al.
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VLBI Data Ingest Improvements at NASA CDDIS
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Session 3. Data Structures, Scheduling and Analysis Strategies
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Sergei Bolotin et al.
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Automatic Processing of INT Sessions with nuSolve
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Marina Gribanova and Elena Skurikhina
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The Application of the Rapid Data Observations of The Quasar VLBI Network in Order to Improve the Accuracy of the Universal Time Prediction
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Lisa Kern et al.
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Impact of the Source Selection and Scheduling Optimization on the Estimation of UT1-UTC in VLBI Intensive Sessions
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Dhiman Mondal et al.
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Quality Assessment of UT1-UTC (dUT1) Estimates Using VGOS Observations
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John Gipson et al.
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Evaluation of KOKEE12M-WETTZ13S VGOS Intensives
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Karen Baver et al.
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The First Year of KOKEE12M-WETTZ13S VGOS Intensive Scheduling: Status and Efforts Towards Improvement
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Matthias Glomsda et al.
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Comparison of Simultaneous VGOS and Legacy VLBI Sessions
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Tobias Nilsson et al.
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The Current and Future Performance of VGOS
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Esther Azcue et al.
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Analysis of VGOS Sessions: Evaluation of Performance with Different Software
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Sujata Dhar et al.
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Determining Favorable Locations for VGOS Establishment in India
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Glenda Coetzer et al.
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Digital Object Identifiers for the IVS
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Arnaud Collioud et al.
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Exploring Source Structure with the Bordeaux VLBI Image Database
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Axel Nothnagel et al.
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First Results of Project on Six-hourly EOP Piecewise Linear Offset Parameterization
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Matthias Schartner et al.
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VieSched++: Recent Developments and Lessons Learned from Two Years of Fully Automated Scheduling
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Sara Hardin
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A Comparison of VieSched++ Simulations with Observed VLBI Sessions
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Session 4. Interpretation of VLBI Results in Geophysics, Geodesy and Astrometry
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Zuheir Altamimi et al.
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ITRF2020 and the IVS Contribution
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Hendrik Hellmers et al.
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Scale Evaluation of the ITRF2020 Solution
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Anastasiia Girdiuk et al.
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Changing from ITRF2014 to ITRF2020 in the Routine VLBI Analysis: First Investigations
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Rüdiger Haas et al.
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Assessment of Parameters Describing the Signal Delay in the Neutral Atmosphere Derived from VGOS Observations
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Christopher Dieck and Megan Johnson
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A New Wiggle in the Wobble? Uncovering Periodic Signals in Intensive Series
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José M. Ferrándiz et al.
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On the Prospects of Explaining and Modeling with Higher Accuracy the Precession-nutation from VLBI Solutions
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David Gordon et al.
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Current CRF Status at X/S and K Bands
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Phil Cigan et al.
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Three Years of ICRF3 Source Positions
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Lucas R. Hunt et al.
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Comparing Images of ICRF Sources at X-, K-, and Q-band
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Sébastien Lambert et al.
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Parsec-scale Jets in AGN: Insights into the Location of the Gamma-Ray Emission from Geodetic VLBI, Gaia EDR3, and Fermi-LAT
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Session 5. Extending the Use of VLBI to Frame Ties, Deep Space Exploration and Other Areas
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David Schunck and Lucia McCallum
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Observing GPS Satellite Signals in L-Band with a Realistic Global VLBI Network: A Simulation Study
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Helene Wolf et al.
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Adjustment of Galileo Satellite Orbits with VLBI Observations: A Simulation Study
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Aletha de Witt et al.
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Sources with Significant Astrometric Offsets Between the S/X and K-band Celestial Frames
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Niu Liu et al.
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Evaluate the ICRF3 Axes' Stability via Extragalactic Source Position Time Series
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David Gordon et al.
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ICRF3 Position and Proper Motion of Sagittarius A* from VLBA Absolute Astrometry
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Ming Hui Xu et al.
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Astrometric Positions of Gravitational Lensed System 1422+231
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