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This Recommendation contains a general purpose wide-range model for terrestrial propagation which predicts basic transmission loss due to both signal enhancements and fading over effectively the range from 0% to 100% of an average year. This makes the model particularly suitable for Monte-Carlo methods, and studies in which it is desirable to use the same propagation model, with no discontinuities in its output, for signals which may be either wanted or potentially interfering. The model covers the frequency range from 30 MHz to 50 GHz. The model is believed to be most accurate from about 3 km to 1 000 km. At shorter distances, the effect of clutter (buildings, trees, etc.) will tend to dominate unless the antenna heights are high enough to given an unobstructed path. There is no specific lower limit, although the path length must be greater than zero. A prediction of basic transmission loss less than 20 dB should be considered unreliable. Similarly, there is no specific maximum distance. Antennas heights above ground level must be greater than zero. There is no specific maximum height above ground. The method is believed to be reliable for antenna altitudes up to 8 000 m above sea level.

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The input parameters for the propagation model ITU-R P.2001-4 are shown in Figure 1 and defined in Table 1. The remaining parameters (such as frequency, Tx/Rx antenna heights and distance) are taken directly from the local environments and SEAMCAT workspace.

Figure 1: GUI of the ITU-R P.2001-4

Table 1: ITU-R P.2001-4 propagation model