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itu530.rst

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Recommendation ITU-R P.530

This Recommendation provides prediction methods for the propagation effects that should be taken into account in the design of digital fixed line-of-sight links, both in clear-air and rainfall conditions. It also provides link design guidance in clear step-by-step procedures including the use of mitigation techniques to minimize propagation impairments. The final outage predicted is the base for other Recommendations addressing error performance and availability.

Introduction

The propagation loss on a terrestrial line-of-sight path relative to the free-space loss (see Recommendation ITU-R P.525) is the sum of different contributions as follows:

  • attenuation due to atmospheric gases;
  • diffraction fading due to obstruction or partial obstruction of the path;
  • fading due to multipath, beam spreading and scintillation;
  • attenuation due to variation of the angle-of-arrival/launch;
  • attenuation due to precipitation;
  • attenuation due to sand and dust storms.

Each of these contributions has its own characteristics as a function of frequency, path length and geographic location. These are described in the paragraphs that follow.

Module description

itur.models.itu530