ロラン地表波実測値に変動を与える要因-I : 地理的要因(I)(日本航海学会第31回講演会)

概要

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It has been well known that the time differences of Loran ground wave of Loran table are not seemed to contain the propagation errors. Therefore we can fix Loran ship's position by Loran table. However, it has been reported that measured values often largerly vary with every measuring. I measured Loran rate 2 H 3 and 2 H 4 in the southern waters off Kyushiyu, I obtained the following results by these observations. 1) When the propagated route of Loran wave is only sea-surface, in the area 50' distance from master station, the error obtained is 1.3μ sec. (in average of 30 points). It may be suggested that above mentioned errors are rather due to the speed of electric wave faster than that of Loran table computed. Moreover I pointed that the base line of 2 H 4 coincides the stream line of "Kuroshio". 2) Loran wave transmission over land gives lower velocity comparison with standard velocity from Loran table.
公益社団法人日本航海学会の論文
1965-01-25