技術試験衛星V型(ETS-V)を用いた船舶通信実験

概要

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In order to provide small ships with satellite communication, small antenna and digital communication technique are necessary. So we carried out the experiment of the propagation characteristics of 2.4〜4.8kbit/s data and digital voice communication using short backfire antenna of 40cm in diameter, in Japanese waters and the Indian Ocean. The results of this experiment are shown as follows; 1) Even in rough sea, fading range (signal accumulative level from 99% to 1%) was about 1.6dB in satellite elevation angle above 43°and about 7dB in low elevation angle of 9°.2) Spectrum of received signal level had three peaks. These were 0.002〜0.008, 0.01〜0.1 and above 0.1Hz. The peaks of 0.002〜0.008 and 0.01〜0.1Hz were caused by ship's rolling and pitching. The peak above 0.1Hz was caused by multipath fading. 3) Even in low elevation angle, experimental digital voice communication gave the good results at C/No of 46.5dBHz and bit error rate of 10^<-3>.
社団法人日本航海学会の論文
1990-03-20