...
- Restriction to propagation over land paths only;
- Flat terrain;
- No negative antenna heights.
...
Figure 471: SEAMCAT Interface to the ITU-R P.1546-1 propagation modelAnchor F471 F471
...
Table 84: ITU-R P.1546-1 propagation modelAnchor T084 T084
Description | Symbol | Type | Unit | Comments |
Variation |
|
|
| Variation in path loss |
General environment |
|
|
| Environment of the propagation: urban, rural, suburban |
System |
|
|
| Digital (BW<1MHz), Digital (BW>1MHz), Analogue |
Time Percentage (min) |
|
|
| Minimum time variability from which the field strengths value are exceeded |
Time percentage (max) |
|
|
| Maximum time variability from which the field strengths value are exceeded |
use user specified local clutter height |
|
|
| User selectable clutter height value which overwrite any predefined value when selected |
This propagation model is described in Recommendation ITU-R P.1546-1 Annex 8, which was developed based on the prior model in Recommendation ITU-R P.370. This is a propagation model for point-to-area prediction of field strength for the broadcasting, land mobile, maritime mobile and certain fixed services (e.g. those employing point-to-multipoint systems) in the frequency range 30 to 3000 MHz and for the distance range 1 km to 1000 km. The model provided in Recommendation ITU-R P.1546-1 should be used in the frequency range (30 to 3 000 MHz) and the same distance range (1 km to 1 000 km). The Land curves are implemented only. The sea curves or the mixed sea-land path are not implemented.