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

12-18
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 12-7: Fading depth versus significant wave height at 3, 5, and 10 GHz in the
region where incoherent multipath dominates.
12.9.3 Suggestions for Further Work
Measurements and models should be extended to vertical polarization and to higher
frequencies (above L-Band).
12.10 Optical Methods for Assessing Fade Margins for Shadowing,
Blockage, and Clear Line-of-Sight Conditions (Chapter 10)
The assessment of fade margins for land-mobile scenarios have traditionally required
transmitter platforms, vehicle tracking systems and complex receiver-data acquisition
systems. More recently, innovative methods have been developed requiring
photographing roadside images of the ambient environment, image reduction and
analysis and application of existing models assuming known constellations of satellites.
Employment of this methodology, referred to as photogrammetry, has led to estimates of
a number of single and joint fade distributions and diversity results for urban areas at
L-Band for earth-satellite scenarios.