Accession Number : AD0673889

Title :   PROPAGATION OF SPHERICAL WAVE IN NON-STATIONARY MEDIA.

Descriptive Note : Technical rept.,

Corporate Author : WASHINGTON UNIV SEATTLE DEPT OF ELECTRICAL ENGINEERING

Personal Author(s) : Carlson,Frederick P. ; Ishimaru,Akira

Report Date : JUN 1968

Pagination or Media Count : 34

Abstract : The paper considers spherical waves propagating in a non-stationary turbulent media. The method of analysis uses the Rytov approximation and the perturbation technique of J. B. Keller. The resulting integral equations are solved by spectral techniques. The results are then compared with other known plane and spherical wave homogeneous and locally homogeneous results. They are then applied to examine the optimum aperture and resolution results of D. L. Fried. It is concluded that it is essential to allow for a distribution of turbulence in a region. In addition, the optimum aperture results for vertical propagation show a marked dependence on the height of the observer and the parameters which describe the distribution of turbulence in the region. The fact that optimum apertures continue to result is considered important and useful. (Author)

Descriptors :   (*TURBULENCE, PROPAGATION), PERTURBATION THEORY, APPROXIMATION(MATHEMATICS), DIFFERENTIAL EQUATIONS, ATMOSPHERIC MOTION, ELECTROMAGNETIC RADIATION, ANTENNA APERTURES, OPTIMIZATION

Subject Categories : Numerical Mathematics
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE