螺旋桨轴频是被动声纳极其重要的目标识别特征之一。
The propeller shaft frequency is one of the important target recognition features for passive sonar.
非平稳信号广泛存在于很多实际场合中，比如如语音、雷达和声纳中的线性调频信号，时频分析是处理非平稳信号的一个强有力的工具。
The non-stationary signal is widely distributed in the reality, such as audio, radar and sonar signals. Time-frequency analysis is an effective tool to process the non-stationary signals.
跳频技术具有很强的抗干扰能力和组网灵活等优点，在军事无线通信、民用移动通信、卫星通信、现代雷达和声纳等电子系统中有重要应用。
Frequency hopping has the advantage of anti-jamming and the flexible of networks, it is important applications of military communication, mobile communication, modern radar and sonar.
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