陸上移動衛星通信における電波伝搬特性評価

概要

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Land mobile satellite communications suffer from frequent cut off of satellite links due to the effects of shadowing generated by trees, buildings and other objects. In this paper, propagation measurement results using ETS-VI non-geostationary satellite are analyzed with high angle of elevation in different environments. The analytical result of the received signal power shows that the shadowing probability reduces as the elevation angle increases, which is a significant advantage for the land mobile satellite services. Furthermore, the analytical results of the cumulative distributions of the fade duration (FD), which is unavailable duration of communication, and of the non-fade duration (NFD), which is available duration of communication, prove that a lower threshold level of the received signal power gave a longer NFD and shorter FD outcome. A new propagation model of cumulative distribution which takes into account in shadowing and line of sight signal is proposed. This model has been fitted to log-normal distribution with good accordance.
東海大学の論文