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• Very-long-baseline_interferometry abstract "Very-long-baseline interferometry (VLBI) is a type of astronomical interferometry used in radio astronomy. In VLBI a signal from an astronomical radio source, such as a quasar, is collected at multiple radio telescopes on Earth. The distance between the radio telescopes is then calculated using the time difference between the arrivals of the radio signal at different telescopes. This allows observations of an object that are made simultaneously by many radio telescopes to be combined, emulating a telescope with a size equal to the maximum separation between the telescopes.Data received at each antenna in the array include arrival times from a local atomic clock, such as a hydrogen maser. At a later time, the data are correlated with data from other antennas that recorded the same radio signal, to produce the resulting image. The resolution achievable using interferometry is proportional to the observing frequency. The VLBI technique enables the distance between telescopes to be much greater than that possible with conventional interferometry, which requires antennas to be physically connected by coaxial cable, waveguide, optical fiber, or other type of transmission line. The greater telescope separations are possible in VLBI due to the development of the closure phase imaging technique by Roger Jennison in the 1950s, allowing VLBI to produce images with superior resolution. VLBI is most well known for imaging distant cosmic radio sources, spacecraft tracking, and for applications in astrometry. However, since the VLBI technique measures the time differences between the arrival of radio waves at separate antennas, it can also be used "in reverse" to perform earth rotation studies, map movements of tectonic plates very precisely (within millimetres), and perform other types of geodesy. Using VLBI in this manner requires large numbers of time difference measurements from distant sources (such as quasars) observed with a global network of antennas over a period of time.".
• Very-long-baseline_interferometry thumbnail The_Southern_Milky_Way_Above_ALMA.jpg?width=300.
• Very-long-baseline_interferometry wikiPageExternalLink ivscc.gsfc.nasa.gov.
• Very-long-baseline_interferometry wikiPageExternalLink ivsopar.obspm.fr.
• Very-long-baseline_interferometry wikiPageExternalLink www.expres-eu.org.
• Very-long-baseline_interferometry wikiPageExternalLink vlbi05_e.php.
• Very-long-baseline_interferometry wikiPageExternalLink www.jive.nl.
• Very-long-baseline_interferometry wikiPageExternalLink e-merlin.
• Very-long-baseline_interferometry wikiPageID "214144".
• Very-long-baseline_interferometry wikiPageRevisionID "585866556".
• Very-long-baseline_interferometry hasPhotoCollection Very-long-baseline_interferometry.
• Very-long-baseline_interferometry subject Category:Astronomical_imaging.
• Very-long-baseline_interferometry subject Category:Geodesy.
• Very-long-baseline_interferometry subject Category:Interferometry.
• Very-long-baseline_interferometry subject Category:Radio_astronomy.
• Very-long-baseline_interferometry subject Category:Radio_telescopes.
• Very-long-baseline_interferometry comment "Very-long-baseline interferometry (VLBI) is a type of astronomical interferometry used in radio astronomy. In VLBI a signal from an astronomical radio source, such as a quasar, is collected at multiple radio telescopes on Earth. The distance between the radio telescopes is then calculated using the time difference between the arrivals of the radio signal at different telescopes.".
• Very-long-baseline_interferometry label "Interferometria wielkobazowa".
• Very-long-baseline_interferometry label "Interferometría de muy larga base".
• Very-long-baseline_interferometry label "Interférométrie à très longue base".
• Very-long-baseline_interferometry label "Very Long Baseline Interferometry".
• Very-long-baseline_interferometry label "Very Long Baseline Interferometry".
• Very-long-baseline_interferometry label "Very-long-baseline interferometry".
• Very-long-baseline_interferometry label "Радиоинтерферометрия со сверхдлинными базами".
• Very-long-baseline_interferometry label "甚长基线干涉测量".
• Very-long-baseline_interferometry label "超長基線電波干渉法".
• Very-long-baseline_interferometry sameAs Very_Long_Baseline_Interferometry.
• Very-long-baseline_interferometry sameAs Interferometría_de_muy_larga_base.
• Very-long-baseline_interferometry sameAs Interférométrie_à_très_longue_base.
• Very-long-baseline_interferometry sameAs 超長基線電波干渉法.
• Very-long-baseline_interferometry sameAs 초장기선_간섭_관측법.
• Very-long-baseline_interferometry sameAs Very_Long_Baseline_Interferometry.
• Very-long-baseline_interferometry sameAs Interferometria_wielkobazowa.
• Very-long-baseline_interferometry sameAs m.01fccb.
• Very-long-baseline_interferometry sameAs Q1148351.
• Very-long-baseline_interferometry sameAs Q1148351.
• Very-long-baseline_interferometry wasDerivedFrom Very-long-baseline_interferometry?oldid=585866556.
• Very-long-baseline_interferometry depiction The_Southern_Milky_Way_Above_ALMA.jpg.
• Very-long-baseline_interferometry isPrimaryTopicOf Very-long-baseline_interferometry.