Features – Evaluate Rain

Calculation of Rain Unavailability.

The effect of rain on a radio link is determined by the frequency, path length, and rain intensity.  Herald utilises the ITU-R models (P.530, P.837, and P838) or the Crane model (North American).

Rain intensity may be determined from the ITU-R database, ITU-R rain region, Crane rain region if using the Crane model, or manually by entering the rain intensity.

The effect of wet snow and melting ice is taken into account according to ITU Rec. P.530-12 and a multiplying factor applied.

The calculated results are applied to the link as loss against fade margin with the overall result being predicted unavailability due to rain.