History of Science and Engineering Annotation << Back «Quasar-KVO» Network – a Unique Russian VLBI Complex Kaidanovsky M.N., Kudryavtsev V.V. The Russian Quasar-KVO Very-Long-Baseline Radio Interferometry Network (VLBI network) is used to obtain high-precision coordinate and timing information for fundamental and applied research. Specifically, the Quasar-KVO system, in cooperation with the international IVS VLBI network, provides Russia with data on Universal Time, Earth rotation parameters, and terrestrial and celestial coordinate reference systems. The Quasar-KVO system is the coordinate and timing basis of the Russian GLONASS satellite navigation system. This article examines the history of the Quasar-KVO VLBI network, its instrumentation, technical characteristics, operating principle, and the system's scientific activities. Keywords: radio telescope, very-long-baseline radio interferometry (VLBI), Quasar-KVO VLBI system, high-precision coordinate and timing information, Earth rotation parameters, GLONASS satellite navigation system, Institute of Applied Astronomy of RAS. DOI: 10.25791/intstg.12.2025.1588 Pp. 27-38.