短語詞組短語sonar echoes classification 聲納信號(hào)分類sonar target classification 聲納目標(biāo)分類passive sonar target classification 被動(dòng)聲納目標(biāo)識(shí)別passive sonar signal classification 被動(dòng)聲納信號(hào)分類 返回 classification sonar