Handbook of Propagation Effects for Vehicular and ... - Courses

4-4
Percentage of Distance Fade > Abscissa
10
1
9
8
7
6
5
4
3
2
1.5 GHz, 45°
870 MHz, 45°
Propagation Effects for Vehicular and Personal Mobile Satellite Systems
1.5 GHz, 30°
870 MHz, 30°
0 1 2 3 4 5 6 7 8 9 10
Fade Depth (dB)
Figure 4-2: Best-fit power curves (Table 4-2) of formulation (4-1) for line-of-sight
distributions in which non-shadowed multipath fading dominates for mountainous terrain.
The distributions may be expressed by
for P = 1 to 10 %
P
−b
= aA , (4-1)
where P is the percentage of distance the fade A (in dB) is exceeded, and where the
values of a, b are tabulated in Table 4-2 at the two frequencies and elevation angles of
30° and 45°. Equation (4-1) and the values in Table 4-2 have been adopted as a
multipath model for mountainous terrain by the ITU-R [1994, 1997].