The effects of ground-reflected rays and atmospheric inhomogeneities on multipath fading

Author

Costa, Emanoel

Author_Institution

Center for Telecommun. Studies, Pontifical Catholic Univ. of Rio de Janeiro, Brazil

Volume

39

Issue

6

fYear

1991

fDate

6/1/1991 12:00:00 AM

Firstpage

740

Lastpage

745

Abstract

Ray tracing through a single horizontally stratified atmospheric layer has been used to support evidence that defocusing of the direct ray, combined with surface multipath, can have an important effect on the performance of overland microwave line-of-sight (LOS) links. The same link and horizontally stratified layer proposed by A.R. Webster (1983) are used to exhibit the agreement between previous results and the present ones, to display a numerical example of multipath effects on terrestrial microwave LOS, and as a reference for detailed discussions. The effects of the combination of the horizontal stratification with a wave-like structure are analyzed. it is seen that the vertical displacement of the structure across the radio link has a strong impact on the parameters of the direct ray, which is translated into fast variations of the received signal around its average value

Keywords

atmospheric boundary layer; electromagnetic wave reflection; fading; microwave links; radiowave propagation; tropospheric electromagnetic wave propagation; atmospheric boundary layer; atmospheric inhomogeneities; ground-reflected rays; horizontally stratified atmospheric layer; multipath fading; overland line-of-sight links; radio link; radiowave propagation; ray tracing; received signal variations; terrestrial microwave LOS; tropospheric propagation; wave-like structure; Atmospheric measurements; Atmospheric modeling; Digital communication; Dispersion; Fading; Helium; Optical reflection; Radio link; Ray tracing; Refractive index;

fLanguage

English

Journal_Title

Antennas and Propagation, IEEE Transactions on

Publisher

ieee

ISSN

0018-926X

Type

jour

DOI

10.1109/8.86870

Filename

86870