This propagation model is fully described in Recommendation ITU-R P.1546-5. Only the land terrain profiles are implemented in SEAMCAT. The ranges of application are the same as for the ITU-R P.1546-4, except for the Tx-Rx horizontal distances that can be smaller than 1 km. In the section about Algorithm description, only the parts of Recommendation ITU-R P.1546-5 that are different from Recommendation ITU-R P.1546-4 are listed.
It must be emphasised that the measurements and modelling in this Recommendation intrinsically include the effect of terminal clutter, so it would be inappropriate to add a calculation of clutter separately.
Figure 478: SEAMCAT Interface to the ITU-R P. 1546-4 propagation model
Table 89: ITU-R Recommendation P.1546-4 propagation model
Description | Symbol | Type | Unit | Comments |
Variation | Variation in path loss | |||
General environment | Environment of the propagation: urban, rural, suburban, dense urban | |||
System | Mobile, broadcasting digital and broadcasting analogue | |||
Time Percentage (min) | Minimum time variability from which the field strength values are exceeded | |||
Time percentage (max) | Maximum time variability from which the field strength values are exceeded | |||
use user specified local clutter height | User selectable clutter height value which overwrite any predefined value when selected | |||
use user specified standard deviation | User selectable standard deviation value which overwrite any predefined value when selected | |||
Area of location variability | 500x500 m, < 2km radius, < 50 km radius | |||
Terminal designations | When selected the algorithm will consider the option a), b) and c) of ITU-R. 1546-4 Annex 5 §1.1. By default it is selected. |
This propagation model is fully described in Recommendation ITU-R P.1546-4. Only the land path is implemented. The sea path and the mixed sea/land path are not implemented. The ranges of application are the same as for the P1546-1.