Accession Number : ADP005732

Title :   A Review of the Role of Surface Reflection in Multipath Propagation over Terrestrial Microwave Links,

Corporate Author : COMMUNICATIONS RESEARCH CENTRE OTTAWA (ONTARIO)

Personal Author(s) : Olsen, Roberic L. ; Martin, Louis ; Tjelta, Terje

Report Date : NOV 1987

Pagination or Media Count : 23

Abstract : It has long been recognized that surface reflection on overwater microwave radio relay paths plays an important role in causing frequency selective multipath fading. However, there has been a tendency among many radio scientists and engineers to assume that similar but less prevalent fading on most overland paths arose mainly from multiple paths through the atmosphere. With the introduction of wide-band digital radio into microwave relay networks, the origin of selective fading has been investigated with renewed interest because of the damaging effects of distortion. There is mounting experimental and theoretical evidence that ground reflection and scattering has an important role in producing much of the selective multipath propagation effects on overland links. This paper reviews both old and new evidence, providing some new insights into the complex mixture of mechanisms involved. Some resulting implications for the design of digital radio links are also discussed.

Descriptors :   *MULTIPATH TRANSMISSION, *TERRAIN, *RADIO RELAY SYSTEMS, RADIO LINKS, FADING(ELECTROMAGNETIC WAVES), NATO.

Subject Categories : Radiofrequency Wave Propagation
      Geology, Geochemistry and Mineralogy
      Command, Control and Communications Systems

Distribution Statement : APPROVED FOR PUBLIC RELEASE