北九州デッカ・チェンの評価と伝搬特性(瀬戸内海西部)-III

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The series of this experiment made in sea water during every fall of 1969-1972 were already brought to the end. The summaries of principal results drawn were as follows. Both phase difference and field strength were measured simultaneously every 2.5/5 minutes and over 72 hours continuously at the four sites of the waters of Seto Naikai. Through the observation the deviation of phase difference could not establish in constant. Since these monitor sites were within 120nmi from the master station and 70nmi from the purple, propagation mode should be ground wave in daytime. These reason why the interference occured presumably introduced by skywave contamination and ambient noise. Moreover the author tried to examine the skywave effect on phase difference fluctuation by field strength obtained. General feature of the correlation between them was able to explain by theory, but the instant variation was shown by taking the various effects. This phenomenon will be destined to the nature of CW wave. To improve the differential Decca result, the correction value was introduced from the mean of every hour determination applied to the Decometer reading, and the fluctuation range observed should be reduced about 50-28% of the value which shown several cels in Purple lane. The reflecting height of Decca frequencies in short distance might be most sensitive and be determined undeveloping properties. The author would advise, if the precise Decca position asked, the differential Decca system will contribute to the requirement of both day and night.
社団法人日本航海学会の論文
1973-07-30

北九州デッカ・チェンの評価と伝搬特性(瀬戸内海西部)-III

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