ロラン地表波測定値に変動を与える要因-V(日本航海学会第36回講演会)

概要

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The author measured the time diffrence of Loran -A in the southern waters of Kyushu for several years, and obtained following results. 1) The constant deviations of the time difference was found in this water, but, they were proportional to the distances from master and slave station. From the result, it concluded that the velocity of Loran radio wave varies faster about 12.2km/sec comparing standard value (299, 708km/sec, for use Loran table) in Fig.3. The pattern of the deviation coincides with the Loran hyperbola. 2) According to many data it seems to be ascertainable that the velocity of 2Mc/s is more affected by the conductivity of sea water than by the refractivity of atmoshere. 3) The deviations in this waters on which the mountain (for example, 500 meters and 700 meters in height) cross the water vary remarkably, however, these values reset normaly at 8 nautical miles from the coast. The author considered that this phenomenon above mentioned are due to the shadow effect of mountain and the recovery effect.
公益社団法人日本航海学会の論文
1967-07-25