Results 31 to 40 of about 11,788,095 (170)
MSWD: A Hybrid Machine‐Learning Framework for Slant Wet Delay Modeling
Journal of Geophysical Research: Atmospheres, Volume 131, Issue 12, 28 June 2026.Abstract Space geodetic techniques such as Global Navigation Satellite Systems (GNSS) and Very Long Baseline Interferometry (VLBI) are limited by direction‐dependent tropospheric delays, with slant wet delay (SWD) being the most variable component and a major error source.
Zhenyi Zhang, Benedikt Soja
wiley +1 more source
Very Long Baseline Interferometry for Global Geodetic Reference Frames
, 2019 Die geodätische Very Long Baseline Interferometry (VLBI) ist das einzige Verfahren zur Bestimmung aller Erdorientierungsparameter und für die Realisierung des International Celestial Reference Frame (ICRF) im Radiowellenbereich.
Krasna, Hana +7 more
core +4 more sources
Precessing Jet in the High-Redshift Blazar J0017+8135
Galaxies, 2016 The prominent flat-spectrum radio quasar J0017+8135 (S5 0014+81) at z = 3.366 is one of the most luminous active galactic nuclei (AGN) known. Its milliarcsecond-scale radio jet structure has been studied with very long baseline interferometry (VLBI ...
Kristóf Rozgonyi, Sándor Frey
doaj +1 more source
Ray tracing-based delay model for compensating gravitational deformations of VLBI radio telescopes
Journal of Geodetic Science, 2022 The precision and the reliability of very long baseline interferometry (VLBI) depend on several factors. Apart from fabrication discrepancies or meteorological effects, gravity-induced deformations of the receiving unit of VLBI radio telescopes are ...
Lösler Michael +6 more
doaj +1 more source
A very long baseline interferometry sky survey [PDF]
, 1980 A systematic very long baseline interferometry (VLBI) sky survey, undertaken to find a suitable set of compact celestial radio sources from which a more complete VLBI reference frame can be constructed, discussed.
Morabito, D. D., Preston, R. A.
core
Ionospheric Data Fusion With GNSS, GNSS‐RO and Satellite Altimetry Based on Machine Learning
Journal of Geophysical Research: Machine Learning and Computation, Volume 3, Issue 3, June 2026.Abstract Global Ionospheric Maps (GIMs) are essential in Global Navigation Satellite System (GNSS) applications, particularly for correcting ionospheric delays in single‐frequency positioning. GIMs are mainly derived from dual‐frequency GNSS observations, but the uneven distribution of ground stations—sparse over oceans—reduces accuracy in these ...
Marcel Iten, Shuyin Mao, Benedikt Soja
wiley +1 more source
Radio Science, Volume 61, Issue 6, June 2026.Abstract Since its observation in 2019, the first image of a super‐massive black hole using Very Long Baseline Interferometry (VLBI) with an Earth‐scale baseline has generated much scientific and public interest. Work is now underway to extend the baseline into space to obtain higher image resolution.
E. A. Burt +5 more
wiley +1 more source
Observing APOD with the AuScope VLBI Array
Sensors, 2018 The possibility to observe satellites with the geodetic Very Long Baseline Interferometry (VLBI) technique is vividly discussed in the geodetic community, particularly with regard to future co-location satellite missions.
Andreas Hellerschmied +5 more
doaj +1 more source
Calibrating VLBI Polarization Data Using GPCAL. II. Time-dependent Calibration
The Astrophysical Journal, 2023 We present a new method of time-dependent instrumental polarization calibration for very long baseline interferometry (VLBI). This method has been implemented in the recently developed polarization calibration pipeline GPCAL.
Jongho Park +2 more
doaj +1 more source
The Short-Arc Precise Orbit Determination of GEO Satellites Using VLBI and Transfer Ranging
Remote Sensing, 2022 It is important for a geostationary Earth orbit (GEO) satellite to rapidly recover its orbit after a maneuver with short-arc precise orbit determination (POD).
Kai Nan +5 more
doaj +1 more source