When we have acoustic surveys in the sea area where there are the mixed species, the wide dynamic range of TS is demanded. The reason is so that the each species has different TS range. Therefore we employed the transducer with window function weight for wide dynamic range of the TS measurement. The TS measurement dynamic range is magnified by decrease of side lobe level. There are a few kinds of fish in a sea area of a district in a high latitude, such as the north sea and the Bering Sea. But there are many kinds of fish in sea area of Southeast Asia, it complicates resources investigation by acoustic surveys.
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