DocumentCode :
1477448
Title :
Modeling Ka-band scintillation as a fractal process
Author :
Celandroni, Nedo ; Potorti, Francesco
Author_Institution :
Ist. CNUCE, CNR, Pisa, Italy
Volume :
17
Issue :
2
fYear :
1999
fDate :
2/1/1999 12:00:00 AM
Firstpage :
164
Lastpage :
172
Abstract :
We propose a model that describes the signal fading process due to scintillation in the presence of rain. We analyzed a data set of uplink (30 GHz) and downlink (20 GHz) attenuation values averaged over 1 s intervals. The data are samples relative to ten significant events, for a total of 180 000 s recorded at the Spino d´Adda (North of Italy) station using the Olympus satellite. Our analysis is based on the fact that the plot of attenuation versus time recalls the behavior of a self-similar process. We then make various considerations, and propose, a fractional Brownian motion model for the scintillation process. We describe the model in detail, with pictures showing the apparent self-similarity of the measured data. We then show that the Hurst parameter of the process is a simple function of the rain fade. We describe a method for producing random data that interpolate the measured samples, while preserving some of their interesting statistical properties. This method can be used for simulating fade countermeasure systems. As a possible application of the model, we show how to optimize fade measurement times for fade countermeasure systems
Keywords :
Brownian motion; electromagnetic wave absorption; fading; fractals; microwave links; microwave propagation; rain; satellite links; scintillation; tropospheric electromagnetic wave propagation; 20 GHz; 30 GHz; Hurst parameter; Ka-band scintillation modelling; Olympus satellite; SHF; Spino d´Adda; attenuation measurements; downlink; fade countermeasure systems; fade measurement times optimization; fractal process; fractional Brownian motion model; measured data; measured samples interpolation; rain; rain fade; random data; self-similar process; signal fading; statistical properties; uplink; Atmospheric measurements; Attenuation measurement; Brownian motion; Degradation; Fractals; Power measurement; Power system modeling; Rain fading; Satellites; Time measurement;
fLanguage :
English
Journal_Title :
Selected Areas in Communications, IEEE Journal on
Publisher :
ieee
ISSN :
0733-8716
Type :
jour
DOI :
10.1109/49.748780
Filename :
748780
Link To Document :
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