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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Published in:International journal of satellite communications Vol. 20; no. 2; pp. 151 - 166
Main Authors: Vazquez-Castro, M., Perez-Fontan, F., Saunders, S. R.
Format: Journal Article
Language:English
Published: Chichester, UK John Wiley & Sons, Ltd 01.03.2002
Wiley
Subjects:
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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Abstract 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.
AbstractList 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.
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 modeling, 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. (Author)
Author Saunders, S. R.
Perez-Fontan, F.
Vazquez-Castro, M.
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Issue 2
Keywords Correlation coefficient
Availability
Urban environment
Cross correlation
Diversity
Analytical method
Satellite telecommunication
Modeling
Shadowing
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– reference: Robet PP, Evans BG, Ekman A. Land mobile satellite communications channel model for simultaneous transmission from a land mobile terminal via two separate satellites. International Journal of Satellite Communications 1992; 10:139-154.
– reference: Lutz E. A Markov model for correlated land mobile satellite channels. International Journal of Satellite Communications 1996; 14:333-339.
– reference: Loo C. A statistical model for land mobile satellite link. IEEE Transactions on Vehicular Technology 1985; 34:122-127.
– reference: Karasawa Y, Kimura K, Minamisono K. Analysis of availability improvement in LMSS by means of satellite diversity based on three-state propagation channel model. IEEE Transactions on Vehicular Technology 1997; 46(4):1047-1056.
– reference: Fontan FP, Vazquez-Castro MA, Buonomo S, Kubista E, Paraboni A, Arbesser B, Baptista P. A methodology for the characterisation of environmental effects on global navigation satellite system (GNSS) propagation. International Journal of Satellite Communications 1998; 16:1-22.
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Snippet Non‐geostationary orbit satellite networks have dynamic, yet deterministic topologies. This paper deals with the consequences of relying on the use of multiple...
Non-geostationary orbit satellite networks have dynamic, yet deterministic topologies. This paper deals with the consequences of relying on the use of multiple...
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SubjectTerms 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
Title Shadowing correlation assessment and modeling for satellite diversity in urban environments
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