船体傾斜による無線方位測定機の誤差(日本航海学会第29回講演会)

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In these days, a great deal of new radio navigation systems are being developed and though utilization of Redio Direction Finder System which takes advantage of straight propagation of radio wave only is decreasing, it is still useful system especially on coasting vessels and fishing boats in our country, moreover it sometimes carries out some peculiar duties like in salvage. This Radio Direction Finder System accompanies various errors and though now most of them have been solved, it is necessary to understand exactly of these errors to get a high accurate ship's position. In this paper, we tried to solve the error caused by ship's heelings which has not been solved yet. At first the heelings are divided into pitching and rolling and of each cases the curve of directional error caused by ship's heeling on Direction Finer which has loop antenna is cleared. It is similar to the quadrantal error. In these cases, the errors are negligible when the radio wave comes from athwart ship or fore and aft diraection and they come to maximum value when radio wave comes from the middle of these directions. Though the maximum value is negligible when the heeling angle is small, it comes to 4 to 8 degrees when the heeling angle becomes 30 to 40 degrees and then it is not negligible. In the next case which both pitching and rolling occur together, the error curve is quite complicated and its value becomes greater than each cases showed above, moreover in this case it also became clear that the error curve varies according to the direction of heeling.
社団法人日本航海学会の論文
1963-12-25

船体傾斜による無線方位測定機の誤差(日本航海学会第29回講演会)

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