Shadowing correlation assessment and modeling for satellite diversity in urban environments

Non‐geostationary orbit satellite networks have dynamic, yet deterministic topologies. This paper deals with the consequences of relying on the use of multiple visible satellites to improve availability with time/locations through satellite diversity techniques. The assumption of independent blockag...

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Vydáno v:International journal of satellite communications Ročník 20; číslo 2; s. 151 - 166
Hlavní autoři: Vazquez-Castro, M., Perez-Fontan, F., Saunders, S. R.
Médium: Journal Article
Jazyk:angličtina
Vydáno: Chichester, UK John Wiley & Sons, Ltd 01.03.2002
Wiley
Témata:
Applied sciences
correlation coefficient
cross-correlation
Exact sciences and technology
land mobile multi-satellite systems availability studies
satellite diversity
Satellite telecommunications. Space telecommunications
shadowing/blockage
Telecommunications
Telecommunications and information theory
Correlation coefficient
Availability
Urban environment
Cross correlation
Diversity
Analytical method
Satellite telecommunication
Modeling
Shadowing
ISSN:0737-2884, 1099-1247
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Shrnutí:Non‐geostationary orbit satellite networks have dynamic, yet deterministic topologies. This paper deals with the consequences of relying on the use of multiple visible satellites to improve availability with time/locations through satellite diversity techniques. The assumption of independent blockage events in two different satellite‐to‐mobile links is generally not accurate and information on shadowing correlation should be taken into account in the assessment of availability.In this paper a shadowing correlation study for urban environments is presented and a model for the real environments, as well as for a generic urban environment is inferred. The model proposed here is simple and can be run on a computer. It also relates urban and constellation geometries thus allowing the identification of those cases for which satellite diversity gain should be expected. As a result of this analysis and modelling, we present empirical analytical expressions describing positive correlation coefficient as a function of satellite angular separation (azimuth and elevation). We also show that an angle exists above which correlation can be negative and satellite diversity can sensibly improve link availability. Copyright © 2002 John Wiley & Sons, Ltd.
Bibliografie:istex:56AEFB409ADC7FEC65367197E1B99636CE9CF5D3
ArticleID:SAT718
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ObjectType-Article-2
SourceType-Scholarly Journals-1
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ISSN:0737-2884
1099-1247
DOI:10.1002/sat.718