very long baseline interferometry

In conventional interferometers and arrays, coaxial cable, waveguide, or even fibre-optic links are used to distribute a common local-oscillator reference signal to each antenna and also to return the received signal from an individual antenna to a central laboratory where it…

In another technique, called very long baseline interferometry (VLBI), simultaneous observations are made with radio telescopes thousands of kilometres apart; this technique requires very precise timing.

” In very long baseline interferometry (VLBI) experiments performed by combining the simultaneous observations of several telescopes spaced by thousands of kilometres, radio astronomers have discovered that some of the compact radio sources located in the nuclei of active galaxies break into several components at high angular…

…by using the technique of very long baseline interferometry (VLBI). In early VLBI systems the signals received at each element were recorded by broad-bandwidth videotape recorders located at each antenna. More recently, with the advent of inexpensive, reliable computer disk drives, the data are recorded on disks. The disks are…