{"references": ["A. Megn, S. Braude, S. Rashkovsky, V. Shepelev, N. Sharykin, G. Inyutin, \"VLBI Network URAN and Interferometric Studies in the Decameter Waveband,\" Journal of Physics, pp.813-818, 1994.", "A. Megn, S. Braude, et al., \"Interferometer observations of the quasar 3C216 at the decameter wavelengths,\" Kinematics and physics of celestial bodies, vol. 17, #3, pp. 195-212, 2001.", "T. Pearson, R. Perley, A. Readhead, \"Compact radio sources in the 3C catalog,\" Preprint Owens Valley radio observatory, Pasadena, California, pp. 1-35, 1984.", "\"Image Formation From Coherence Functions in Astronomy,\" Edited by Cornelis Van Schooneveld, Leiden Observatory, Leiden, The Netherlands, D. Reidel Publishing Company, 317p., 1978.", "J.K. Hargreaves, \"The solar-terrestrial environment,\" Cambridge: University Press, 420p., 1992.", "R. Thompson, J.Moran, G. Swenson, \"Interferometry and Synthesis in Radio Astronomy,\" New York: WileyInterscience Publication, John Wiley & Sons, 567p., 1986.", "A.C. Kak, M. Slaney, \"Principles of Computerized Tomographic Imaging,' IEEE Press., 322p., 1988.", "N. E. Kassim, R. A. Perley, K. S. Dwarakanath, and W. C. Erickson, \"Evidence for thermal absorption inside Cassiopeia A,\" Astrophys. J. Letters, 455, pp. L59-L62, 1995."]}

Ionosphere influence practically excepts phase measurements at interferometric observations and leads to a "phase problem" in decameter radio astronomy. A tomographic approach to data processing based on use of the longitudinal correlation function as new information parameter at interferometric observations is proposed to solve an image reconstruction problem. It allows to reduce this problem up to a classical task of tomographic reconstruction on base of parallel projections. Such technique is less subject to influence of phase distortions. The developed tomographic procedure is being illustrated by results of numerical modeling with use of the experimental image of the CasA.