Results 91 to 100 of about 9,059 (229)
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
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
Combining VLBI and GPS for inter-continental frequency transfer [Elektronisk resurs] [PDF]
, 2015 For decades the Global Positioning System (GPS) has been the only space geodetic technique routinely used for inter-continental frequency transfer applications. In the past VLB) has also been considered for this purpose and the method's capabilities were
Haas, Rüdiger, +3 more
core
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
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
A Simulator to Generate VLBI Baseband Data in Matlab [PDF]
, 2019 VLBI radio telescopes represent a sophisticated interconnection of electronic devices. The final product of each observation by a radio telescope is the baseband data. In this presentation, we show a software tool as part of the Vienna VLBI and Satellite
Schartner, Matthias +3 more
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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
ITA-JPN Broadband VLBI Experiment for Optical Clock Comparison [PDF]
, 2019 NICT has developed a broadband VLBI (very-long-baseline interferometry) system for intercontinental frequency transfer. After domestic tests in Japan, a 2.4 m diameter VLBI station was exported and installed at Medicina astronomy observatory of INAF in ...
Ujihara, H. +25 more
core
The Structure and Propagation of the Misaligned Jet M87
Galaxies, 2016 Due to its proximity, M87 is a prime target for next-generation high-resolution VLBI at short millimeter wavelengths, by which the jet launching region and the black hole shadow are expected to be resolved and imaged sometime soon.
Kazuhiro Hada
doaj +1 more source