Results 81 to 90 of about 9,054 (229)
Annals of Geophysics, 2010 Very-long-baseline interferometry (VLBI) is used for establishing global geodetic networks where the coordinates attain a 1-mm level of precision. Technique-dependent bias can degrade the VLBI positioning accuracy if it is present and unaccounted for ...
Claudio Abbondanza +2 more
doaj +1 more source
Space Weather, Volume 23, Issue 7, July 2025.Abstract Global ionospheric mapping is essential for ionospheric research. However, conventional approaches often struggle to accurately capture small‐scale ionospheric variations. This study proposes a deep ensemble method based on neural networks (NNs) that generates high‐accuracy global vertical total electron content (VTEC) maps along with ...
Shuyin Mao +6 more
wiley +1 more source
Linking Planetary Ephemeris Reference Frames to ICRF via Millisecond Pulsars
UniverseThe positions of millisecond pulsars (MSPs) can be determined with sub-milliarcsecond (mas) accuracy using both Very Long Baseline Interferometry (VLBI) and timing, referenced to the International Celestial Reference Frame (ICRF) and planetary ...
Li Guo +4 more
doaj +1 more source
Earth and Space Science, Volume 12, Issue 6, June 2025.Abstract The findings from the Second Earth Orientation Parameters Prediction Comparison Campaign (2nd EOP PCC) suggest that integrating effective angular momentum (EAM) is vital for enhancing the accuracy of polar motion (PM) predictions. Building on Dill et al.
Wei Miao +3 more
wiley +1 more source
, 2013 This report summarizes the activities of the Shanghai VLBI Correlator during ...
Fengchun Shu +5 more
core +1 more source
Expanding New Zealand VLBI capability and the 30m dish
, 2014 We describe our current VLBI activities with the 12m dish; but also with the conversion of a former 100-foot (30-m) telecommunication antenna in New Zealand into a radio telescope show the future capabilities. Provide a brief of the specifications of the
Weston, S
core +1 more source
New Astronomy Reviews, 1999 We discuss the technique of Wide-field imaging as it applies to Very Long Baseline Interferometry (VLBI). In the past VLBI data sets were usually averaged so severely that the field-of-view was typically restricted to regions extending a few hundred milliarcseconds from the phase centre of the field.
Garrett, M. A. +4 more
openaire +2 more sources
Journal of Geophysical Research: Solid Earth, Volume 130, Issue 6, June 2025.Abstract Non‐tidal loading (NTL) introduces surface deformation on the Earth and increases the variability in coordinates measured by space geodetic techniques. Correcting NTL displacements in Global Navigation Satellite Systems (GNSS) analysis has been discussed extensively, commonly at the parameter level.
Jungang Wang +6 more
wiley +1 more source
Studying the Inner Heliosphere Using Radio Signals Transmitted From Spacecraft Orbiting Mars
Space Weather, Volume 23, Issue 5, May 2025.Abstract In this campaign, we used very long baseline interferometry (VLBI) radio telescopes to track the carrier radio signal transmitted from spacecraft orbiting Mars during the Mars solar conjunction. The campaign extended from September 6th $6\text{th}$ to November 6th $6\text{th}$ 2021 and targeted the Mars Express (MEX) and Tianwen‐1 (TIW ...
J. Edwards +4 more
wiley +1 more source
, 2015 Ray-traced delays offer the opportunity to correct the influences of the troposphere on observations of space geodetic applications such as Very Long Baseline Interferometry (VLBI).
Hofmeister, Armin +2 more
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