History of Science and Engineering Annotation << Back Colocation of instruments for space geodetic observations at the «Quasar» VLBI network observatories Gayazov I.S. Ipatov A.V. Smolentsev S.G. The work describes the main features of a colocation system developed on basis of the observatories of domestic radio interferometric network «Quasar» (Institute of Applied Astronomy of the Russian Academy of Sciences – IAA RAS). The principles of colocation of space geodetic techniques for solving problems of astrometry, geodesy and geodynamics, including detailed studying of the Earth rotation features are briefly stated. General information about hardware of the «Quasar» network observatories as samples of modern colocation stations is given. The role of these stations in international programs of high-precision space geodetic observations is emphasized. Work also includes the review of the activity on realization of the data level colocation in framework of the Earth rotation parameters service, which is functioning at IAA RAS since 1995. Keywords: Earth rotation; space geodesy; observation methods; colocation of instruments; data processing; combined results. Contacts: E-mail: gayazov@ipa.nw.ru Pp. 18-26.