线谱是船舶辐射噪声中重要的特征信息，线谱提取是水中目标识别的关键技术。

Line spectra provide significant information in ship-radiated noise. Extracting spectral lines from ship-radiated noise is a key technique in identification of underwater targets.

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鱼类等水生动物具有非凡水中游动能力，其推进和操纵系统的突出优点是高效率、低噪声、良好机动性。

Fish and such swimming animal have excellent propulsion and maneuvering system, whose advantages are high efficiency and low noise.

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以水中运动目标为例，给出了水声环境下，合成信号、环境噪声、海洋声学的数学模型和合成环境系统仿真实验。

This paper focuses on the research of the system structure of the synthetic environment of the passive sonar and the modeling and simulation test of the underwater sound synthetic signal.

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