音響資源調査におけるエコ-レベルに及ぼす船体動揺の影響

概要

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The effects of motion of research vessel on variation of echo level in acoustic survey was investigated, by using the multi-dimensional auto-regressive model, in which the echo level was adopted as the output variable and the following 5 ship's motions and incident angle as the input ones: pitch, roll, and acceleration in 3 dimensions. In bow sea the power spectra of echo levels showed a good correspondency to those of ship's motions, which were mainly concentrated in 0.2Hz. The power contribution of Z axis acceleration to echo level variation was the highest among the 6 input variables. With increase in ship's speed, however, the correspond-ency of echo level variation to ship's motions became obscure. In follow sea the echo level showed small variation without any clear correlation to ship's motion. It was suggested that the multi-dimensional auto-regressive model is one of the effective methods to express quantitatively the variation of echo level caused by ship's motion.
日本水産學會の論文