发言人克劳普说他不知道具体细节，但是之前传闻内容涉及声纳浮标，它能够识别鲨鱼并传出警告信号。
Klopper said he was unaware of details, but past speculation has included sonar buoys able to identify sharks and transmit a warning signal.
高速前进时它难以识别用于导航的声纳信号。
High speeds can make it hard to decipher the sonar signals used for guidance.
在现代被动声纳系统中，水下目标的自动识别是关键技术之一。
Automatic recognition of underwater targets is one of the key techniques in modern passive sonar systems.
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