Shaft frequency is one character of the target which can be applied to underwater targets identification.
轴频是目标的特征之一，可以应用于目标识别当中。
Different propeller has different shaft frequency.
目标的螺旋桨不同则轴频不相同。
The propeller shaft frequency is one of the important target recognition features for passive sonar.
螺旋桨轴频是被动声纳极其重要的目标识别特征之一。
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