軽量コンクリート塀で囲まれた住宅地交差点における720MHz帯の3次元FDTD電波伝搬解析

摘要

Recently, inter-vehicle communication system using 720MHz band to prevent car crush at an intersection has been proposed. In Japan, there are many intersections surrounded by light-weight concrete walls in residential area, which have poor visibility. The propagation characteristics at the intersection not considered the ground and wall height have been traditionally analyzed by using the FDTD method in the two-dimensional space. In this paper, the three-dimensional propagation analyses of 720MHz band at an intersection surrounded by light-weight concrete walls in residential area have been carried out by using the FDTD method. As a result, it was shown that the ground have a relatively great influence on the propagation loss at non-line-of-sight region.%本研究では，住宅地直線道路及び交差点における720MHz帯の3次元電波伝搬解析を行い，大地及び家屋塀が伝搬特性に与える定性的な影響を明らかにした.その結果，住宅地直線道路では家屋塀厚みが伝搬損失に与える影響は小さく，大地及び家屋塀高さの影響が比較的大きいことが示された.一方，一般的な家屋塀厚み及び高さを考慮した住宅地交差点では，3次元解析においても2次元解析と同様に見通し外領域で比較的強い透過波が伝搬することが確認された.