Physics
Scientific paper
May 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991raf....34..492k&link_type=abstract
Radiofizika (ISSN 0021-3462), vol. 34, May 1991, p. 492-500. In Russian.
Physics
Interstellar Matter, Radio Scattering, Speckle Interferometry, Angular Resolution, Stochastic Processes
Scientific paper
A qualitative analysis of wave-field fluctuations in weak- and strong-scattering regimes is presented. It is shown that, for meter radio waves, scattering in the interstellar medium results in the appearance of stochastic multipath propagation and speckle structure in the source image. A method of speckle interferometry is considered for stochastic multipath propagation in the interstellar medium. An analytical solution for the cross-frequency field-correlation function is studied and the coherence bandwidth is estimated as a function of frequency. The scattering in the interstellar medium places a limit on the angular resolution of aperture synthesis systems which are estimated in the paper.
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