дКЪ НАЕЯОЕВЕМХЪ ЙНППЕКЪЖХНММНИ НАПЮАНРЙХ МЮАКЧДЕМХИ МЮ МЮГЕЛМН-ЙНЯЛХВЕЯЙНЛ ХМРЕПТЕПНЛЕРПЕ Б ОПНЕЙРЕ "пЮДХНЮЯРПНМ" цюхь Х юйж тхюм ПЮГПЮАНРЮКХ МЮБХЦЮЖХНММСЧ ЛНДЕКЭ ДБХФЕМХЪ ЙНЯЛХВЕЯЙНЦН ПЮДХНРЕКЕЯЙНОЮ (йпр) ДКЪ БШВХЯКЕМХЪ ГЮДЕПФЙХ Х ХГЛЕМЕМХЪ ТЮГШ ЯХЦМЮКЮ, МЕНАУНДХЛШУ ОПХ СОПЮБКЕМХХ ПЮАНРНИ ЙНППЕКЪРНПЮ. гЮ НЯМНБС АШК БГЪР ОЮЙЕР юпхюдмю [1] ДКЪ НАПЮАНРЙХ МЮАКЧДЕМХИ МЮ МЮГЕЛМШУ пяда. рЮЙФЕ ОЮЙЕР АШК ХЯОНКЭГНБЮМ ДКЪ НЖЕМЙХ ОЮПЮЛЕРПНБ МЮГЕЛМН-ЙНЯЛХВЕЯЙНЦН ХМРЕПТЕПНЛЕРПЮ.

The RadioAstron project is an international collaborative mission to launch a satellite carrying a 10-m space radio telescope (SRT) on the elliptical orbit around the Earth. The aim of the mission is to create the ground-space VLBI to observe the radio sources with high angular resolution. The orbit of the SRT has an apogee altitude about 330,000 km, a period of 8-9 days, and an eccentricity about 0.9. The ground-space VLBI observations at a standard radio astronomical wavelength set of 1.35, 6, 18, and 92 cm with such orbit would provide information about structure of the galactic and extragalactic radio sources at microarcsecond level.
Our goal is to use the ground-space VLBI observations for the solution of some astrometric problems such as study of the defining sources structures and their variations, connection of the ICRF and dynamical system based on the pulsar timing, by means of measuring the ground telescopes coordinates relative to the center of mass of the Earth.
It was shown that the key for solution of these problems is the reconstruction of the SRT precise orbit. Model of motion of the SRT was developed for calculation of the interferometer delay and other parameters to ensure the proper work of the Astro Space Center correlator in use. The ARIADNA/ORBITA package was used as base for correlation process.
To study the parameters of the ground-space interferometer two noisy signals "received" by the ground telescope and SRT were emulated. At first step the position and velocity of the SRT were varied relative to the known (true) trajectory and then the signal to noise ratio (SNR) was changed. Correlation of signals gives us possibility to estimates such parameters of the ground-space VLBI as sensitivity and its dependence from the integration time, the coherence time and dependence from the SNR and the SRT position errors. It was shown that to ensure the mission success the different methods of SRT orbit control has to be developed and applied.