鋼船における無線LAN(Wi-Fi)機器利用のための基礎調査 : 電界強度分布測定

概要

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We conducted the experiment measuring the electric field strength and communicating by VoIP (Voice over Internet Protocol) system with wireless LAN (Wi-Fi) in the steel vessel of 10,000 gross ton. The IEEE802.11b access points (2.4GHz) were used in this study. The measured electric field strength was higher than that calculated assuming free-space propagation in the vehicle deck (164m×27m) space of the steel vessel, because of the influence of the reflected wave etc. Communication by a wireless IP phone was possible everywhere in the vehicle deck using one access point. In the case of the SUNFLOWER (10,000-ton class RORO vessel), if 4 access points are set up on every floor, the electric field is strong enough for communication with a wireless IP phone. Each of four access points was installed on both sides of the prow and stern areas. Interference and noise were not observed in the 2.4GHz band on the voyage in the bridge.
2009-09-25