大規模FDTD解析を用いた航空機内における携帯電話周波数帯電波の伝搬特性評価

摘要

Recently, some airlines have begun allowing in-flight voice calls. On the other hand, some paper reported that electromagnetic interference (EMI) to aircraft systems from active radio transmitters is possible. The aim of this study is to develop accurate and reliable estimation method of electromagnetic field distributions in aircraft that can contribute to numerical EMI assessment technique. In this report, large-scale numerical simulations are carried out to examine the electromagnetic fields excited by the 800 MHz cellular radio inside an aircraft. We used a typical aircraft model and employed the FDTD technique and a supercomputer to estimate the field distributions inside the whole area of the cabin. Computational result of 1-dimensional electric filed distribution inside the cabin agreed well with measured one. Additionally, in order to estimate polarization characteristics inside aircraft cabin, a cross-polarization ratio (XPR) was evaluated.%近年，国際線の航空機内でも携帯電話や無線LANを利用したサービスが提供され，今後もそれらの利用拡大は進むと予想される.それに伴い，機内の電磁環境について詳細に検討することが，無線通信システムを利用するための重要な課題とされている.本報告では，FDTD法を用いた詳細な数値解析により，航空機内における800MHz帯携帯電話電波の伝搬特性推定を行う.実機を用いて行われた機内における1次元電界強度分布の測定結果と計算結果はよく一致した.さらに，解析により得られた機内の電磁界強度分布から交差偏波電力比を評価した.