Results 41 to 50 of about 9,054 (229)

Software and Techniques for VLBI Data Processing and Analysis

Universe, 2022
Very-long-baseline interferometry (VLBI) is a challenging observational technique, which requires in-depth knowledge about radio telescope instrumentation, interferometry, and the handling of noisy data.
Michael Janssen, Jack F. Radcliffe, Jan Wagner   +2 more
doaj   +1 more source

VLBI Observations of the Nucleus of Centaurus A [PDF]

Symposium - International Astronomical Union, 1982
VLBI observations of the nucleus of Centaurus A have been made at three southern hemisphere observatories. Since Centaurus A is the nearest active galaxy, VLBI investigations are important because the physical processes in the nucleus can be studied in greater linear detail than in other similar galaxies.
R. A. Preston, A. E. Wehrle, D. D. Morabito, D. L. Jauncey, M. Batty, R. F. Haynes, A. E. Wright, G. D. Nicolson   +7 more
openaire   +1 more source

At the extremes of the electromagnetic spectrum: synergy of MAGIC and VLBI arrays in the study of blazar jets

, 2023
The emission from blazar jets extends over the entire electromagnetic spectrum, from the radio to the very-high-energy (VHE) gamma rays range. The VLBI technique characterizes the parsec-scale regions of blazar jets. VLBI observations, e.g.
Nanci, Cristina on behalf of the MAGIC collaboration
core   +1 more source

An Experiment on Radio Location of Objects in the Near-Earth Space with VLBI in 2012

Open Astronomy, 2013
An experiment on radar location of space debris objects using of the method of VLBI was carried out in April, 2012. The radar VLBI experiment consisted in irradiation of some space debris objects (4 rocket stages and 5 inactive satellites) with a signal ...
Nechaeva M., Antipenko A., Bezrukovs V., Bezrukov D., Dementjev A., Dugin N., Konovalenko A., Kulishenko V., Liu X., Nabatov A., Nesteruk V., Pupillo G., Reznichenko A., Salerno E., Shmeld I., Shulga O., Sybiryakova Y., Tikhomirov Yu., Tkachenko A., Volvach A., Yang W.-J.   +20 more
doaj   +1 more source

VLBI Activities in Japan and a Projected Space-VLBI Program [PDF]

Symposium - International Astronomical Union, 1988
There are three institutes in Japan that are equipped with VLBI facilities. Of these, Nobeyama Radio Observatory started VLBI experiments with astrophysical and astrometric interests. The Institute of Space and Astronautical Science, the Nobeyama Radio Observatory, and the Radio Research Laboratory collaborated with JPL and other institutions for this ...
openaire   +1 more source

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

First proof of concept of remote attendance for future observation strategies between Wettzell (Germany) and Concepción (Chile) [PDF]

, 2010
Current VLBI observations are controlled and attended locally at the radio telescopes on the basis of pre-scheduled session files. Operations have to deal with system specific station commands and individual setup procedures.
Hase, H, Oñate, E, Zaror, P, Ettl, Martin, Mühlbauer, M, Dassing, R, Herrera, C, Neidhardt, Alexander, Sobarzo, S, Plötz, C   +9 more
core  

Effects of Surface Errors of Antennas on Detection Performance of Space VLBI

Aerospace, 2022
This work investigates the effects of the surface errors of the satellite antenna on the detection performance of the space VLBI system. First, the relationship between the surface errors and the antenna gain loss is analyzed, and then the influence of ...
Yangyang Zhang, Huijie Liu, Xingfu Liu
doaj   +1 more source

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

РАДИОСТРУКТУРА ИСТОЧНИКА 1803÷784

Odessa Astronomical Publications, 2011
Results of processing of data of ground-space VLBI experiment titled V053 are presented. These observations were made in 1997 October with 10 antennas of American interferometer VLBA and with Japan space telescope VSOP (VLBI Space Orbit Program).
A. А. Чуприков
doaj   +1 more source