Accession Number : AD0487549

Title :   THE EFFECT OF A TURBULENT MEDIUM ON THE POWER PATTERN OF A WAVEFRONT TRACKING CIRCULAR APERTURE.

Descriptive Note : Rept. for 1 Apr-20 Jun 66,

Corporate Author : AEROSPACE CORP EL SEGUNDO CA LAB OPERATIONS

Personal Author(s) : Heidbreder, G. R. ; Mitchell, R. L.

Report Date : MAY 1966

Pagination or Media Count : 31

Abstract : The angular power pattern, or equivalently the image plane intensity distribution, is obtained for a circular aperture receiving a plane wave perturbed in transmission through a turbulent atmosphere. The aperture is assumed always to be aligned so as to minimize the area integral of mean square phase fluctuation. This alignment is shown to be that effected by a conventional angle tracking servomechanism. Homogeneous, isotropic turbulence is assumed, and the aperture is taken to be of moderate size so that the 5/3 law phase structure function predicted by use of the Obukhov-Kolmogorov theory of turbulence applies adequately over its full extent. Power patterns for tracking and nontracking apertures are compared.

Descriptors :   (*ANTENNA APERTURES, RADAR TRACKING), (*ANTENNA RADIATION PATTERNS, ATMOSPHERIC MOTION), RADAR ANTENNAS, PERTURBATION THEORY, RADIOFREQUENCY POWER, REDUCTION, ELECTROMAGNETIC RADIATION, REFRACTIVE INDEX, PERFORMANCE(ENGINEERING), MATHEMATICAL ANALYSIS.

Subject Categories : Active & Passive Radar Detection & Equipment
      Radiofrequency Wave Propagation

Distribution Statement : APPROVED FOR PUBLIC RELEASE