2,583 research outputs found

    Vector AR Implementation for Rain Rate Space Time Series Modeling in Surabaya

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    Site diversity is one of the Fading Mitigation Techniques (FMT) that is a base system design on the nature of rain rate that change to the time and space. However, to get appropriate site diversity needs deep knowledges about rain rate dynamic and statistical characteristic. In this research, rain rate space-time series modeling in 4 rain gauges location studied by using Vector AR (VAR) model. To validate VAR model, it used 3 methods; ecdf graphic comparison, qqplot method and model residual analysis. The result showed that VAR model is correct and appropriate model for rain rate space time series modeling in 4 rain gauges location. These VAR models have good accuracy with Spatial RMSE Mean between 0.273 - 0.763

    Spatio–temporal rain attenuation model for application to fade mitigation techniques

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    The influence of polarization on millimeter wave propagation through rain

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    The measurement and analysis of the depolarization and attenuation that occur when millimeter wave radio signals propagate through rain are described. Progress was made in three major areas: the processing of recorded 1972 data, acquisition and processing of a large amount of 1973 data, and the development of a new theoretical model to predict rain cross polarization and attenuation. Each of these topics is described in detail along with radio frequency system design for cross polarization measurements

    Concepts for 18/30 GHz satellite communication system, volume 1A: Appendix

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    The following are appended: (1) Propagation phenomena and attenuation models; (2) Models and measurements of rainfall patterns in the U.S.; (3) Millimeter wave propagation experiments; (4) Comparison of the theory and Millimeter wave propagation experiments; (4) Comparison of theory and experiment; (5) A practical rain attenuation model for CONUS; (6) Space diversity; (7) Values of attenuation for selected U.S. cities; and (8) Additional considerations

    A compendium of millimeter wave propagation studies performed by NASA

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    Key millimeter wave propagation experiments and analytical results were summarized. The experiments were performed with the Ats-5, Ats-6 and Comstar satellites, radars, radiometers and rain gage networks. Analytic models were developed for extrapolation of experimental results to frequencies, locations, and communications systems
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