Near-horizontal line-of-sight millimeter-wave propagation measurements for the determination of outer length scales and anisotropy of turbulent refractive index fluctuations in the lower troposphere

Variances of the normalized power, the angle of arrival, and temporal spectra were obtained from millimeter-wave propagation experiments. For their interpretation the existing theory for monochromatic spherical wave propagation through an anisotropic weakly turbulent medium had been expanded such th...

Full description

Saved in:
Bibliographic Details
Published in:Radio science 2002-01, Vol.37 (2), p.121-1219
Main Authors: Ludi, Andreas, Magun, Andreas
Format: Article
Language:English
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Variances of the normalized power, the angle of arrival, and temporal spectra were obtained from millimeter-wave propagation experiments. For their interpretation the existing theory for monochromatic spherical wave propagation through an anisotropic weakly turbulent medium had been expanded such that anisotropy of the refractive index fluctuations transverse to the propagation path is taken into account. The comparison of experimental and theoretical results provides path-averaged estimates for the outer scale L sub(0 ) in vertical and horizontal directions within the first few hundred meters above ground. Thus a determination of the atmospheric anisotropy is feasible, and it is found to be related to the atmospheric stability. The values obtained for L sub(0) in vertical and horizontal directions are compatible with those presented in the literature. We found that the size and the anisotropy of L sub(0) depend significantly on atmospheric conditions and vary accordingly widely in time.
ISSN:0048-6604