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At present the Radioastron (RA) Earth's satellite having very elliptic orbitis used for probing of the gravitational red shift effect [1, 2]. Objective ofthis test consists in the enhancing accuracy of measurement to check thecorrespondence of value of the effect to Einsten's theory at one order of valuebetter then in was done in the GP-A experiment [3]. There are two H-masers indisposal, one at the board of satellite and other at the Land Tracking Station(LTS). One can compare its mutual time rate using communication radio linksbetween RA and LTS. In contrast with the GP-A experiment there is a possibilityof measurement repetition and accumulation of data in the process of RA orbitalcirculation. In principle it might be resulted in the increasing of theintegral accuracy. In this paper we investigate the achievable accuracy in theframe of particular method of the red shift extraction associated with thetechical specific of RA mission.

Filtration of the gravitational frequency shift in the radio links communication with Earth's satellite