A high-frequency electromagnetic wave propagating through a randomly inhomogeneous medium will create random intensity pattern whose spatial structure is a function of the radiation wavelength and the parameters of the medium. The ability to detect the spatial variation and to find correlation between different patterns depends on the ratio between the receiver aperture and the characteristic spatial scale of the speckle. In this work, using the multiscale expansion solutions for the nonaveraged coherence functions, we have constructed expressions for the integral correlation characteristics and performed a qualitative analysis of the correlation dependences as functions of range and detector aperture for media with Gaussian and power-law refractive index fluctuation spectra. Numerical computations are presented and comparison with the asymptotic results obtained for the strong scattering regime is performed.

Date Published: 13 August 1993
PDF: 11 pages
Proc. SPIE 1971, 8th Meeting on Optical Engineering in Israel: Optical Engineering and Remote Sensing, (13 August 1993); doi: 10.1117/12.150989

Published in SPIE Proceedings Vol. 1971:
8th Meeting on Optical Engineering in Israel: Optical Engineering and Remote Sensing
Moshe Oron; Itzhak Shladov; Yitzhak Weissman, Editor(s)