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Terrestrial line-of-sight links: Recommendations ITU-R P.530

Terrestrial line-of-sight links: Recommendations ITU-R P.530

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Recommendation ITU-R R530 (1999) presents propagation data for planning terrestrial line-of-sight radio systems, typically operating in frequency bands between 1 GHz and 45 GHz, and gives step-by-step methods for predicting the performance of these systems for percentage times down to 0.001 per cent. The recommendation deals only with effects related to the wanted signal. The interference aspects of terrestrial line-of-sight link design are covered in Recommendation ITU-R P.452 (1999). Although the prediction methods presented in Recommendation ITU-R P.530 are based on the physics of radio propagation, measured data was used as the main foundation and the majority of the formulae are semi-empirical statistical relationships. The Recommendation divides broadly into methods for determining the antenna heights (with and without antenna height diversity) and methods for calculating the statistics of signal fading, enhancement and depolarisation. In the case of clear air effects the methods are subdivided into a quick (initial planning) method and a more detailed method, which requires terrain data for the area of the link. Other topics covered are: the correlation of simultaneous fading on multihop links, the frequency and polarisation scaling of rain attenuation statistics, the statistics of rain fade duration and the prediction of the error performance and availability of digital systems.

Inspec keywords: radiowave propagation; rain; interference (signal); radio links

Other keywords: Recommendation ITU-R P.530; Recommendation ITU-R P.452; interference aspects; radio propagation; terrestrial line-of-sight links; multihop links; rain attenuation statistics; Recommendation ITU-R R530; signal fading statistics; terrestrial line-of-sight radio systems

Subjects: Radio links and equipment

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