標準球のエコー積分による魚群探知機の精確な較正

概要

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Precision calibration of echo sounder by integration of sphere echoes is studied. In this method, the total sensitivity of the system is easily and quickly determined by comparing the echo integrator output for standard sphere echoes with the theoretical value. A strict theoretical expression is derived considering the bandwidth of receiving system and the time varied gain (TVG) effect on the sphere echo shape. The strict expression is compared with approximate ones and with experimental values. Experimental values agree fairly well with the theoretical calculations. For precise calibration, the effective pulse width should be calculated from the actual echo shape since the bandwidth of the receiving system changes the echo shape. When a long pulse width is used, the TVG effect should not be neglected.
社団法人日本音響学会の論文