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

9-22
Fade Depth (dB)
7.0
6.5
6.0
5.5
5.0
4.5
4.0
3.5
3.0
Propagation Effects for Vehicular and Personal Mobile Satellite Systems
f = 10 GHz
f= 5 GHz
f = 3 GHz
0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6
Significant Wave Height (m)
Figure 9-19: Fading depth versus significant wave height at 3 GHz, 5 GHz, and 10 GHz
extracted from Figure 9-18 in the region where incoherent multipath dominates.
9.6 Other Maritime Investigations
9.6.1 Experimental Measurements in Japan during 1980 and 1983
Ohmori et al. [1985] report on experimental results at sea shores at Wakasa Bay and
Echizen Cape in Fukui Prefecture, Japan in 1980 and 1983. In the 1980 experiment, L-
Band (1.54 GHz) and VHF (250 MHz) transmitter systems were placed at the top of a
300 m mountain (Mt. Tennou-san). The receiver was located on the shore (3800 m
distance) of an intervening body of water. The 1983 experiment involved reception of a
time-division-multiplexing carrier at 1.538 GHz radiated from the geostationary
INMARSAT satellite located above the India Ocean. In both experiments the elevation
to the radiating source was 5° and circular polarization was used. A wave rider buoy
measured the sea wave height. Measurements were performed by these investigators in
calm seas (RMS wave height h of approximately 0.06 m and rougher seas (h = 0.4 to 0.9
m). Cumulative fading distributions at L-Band (using a short backfire antenna) for
rougher sea conditions showed that 99%, 95%, and 90% of the times the fading signals