ドプラログによる対地速度の測定誤差に関する考察

概要

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Ship's ground speed measured by means of ultrasonic doppler effect intends to get influence by the difference of sound velocity, the sea bottom inclination, the ship's course, the trim and the transducer installation etc. This paper describes theoretical consideration of the ground speed error caused by these influences and analysis by a computer on observed speed data. Comparing the real speed obtained by the ship's radar with the speed of a single beam type Doppler log equipped on the training ship Umitaka Maru, transducer setting error and unknown error were obtained by calculation after removing the errors due to the bottom inclination where the sound hits, and other known errors. Since the residual errorr was in the Gauss's distribution within the error of 5 percent, these analysis might be applied for future designing of Doppler logs.
公益社団法人日本航海学会の論文
1978-08-25