A Review of the Role of Surface Reflection in Multipath Propagation over Terrestrial Microwave Links,
COMMUNICATIONS RESEARCH CENTRE OTTAWA (ONTARIO)
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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.
- Radiofrequency Wave Propagation
- Geology, Geochemistry and Mineralogy
- Command, Control and Communications Systems