针对船舶、潜艇等水声目标螺旋桨轴频自动提取困难的问题，文中提出一种基于平均能量累积和脉冲序列匹配的水声目标螺旋桨轴频特征提取算法，算法首先将噪声不同频段的调制信息利用多频段融合改进方法对DEMON谱进行线增强，然后利用平均能量累积方法对与螺旋桨轴频及其谐波相关的线谱进行提取，由于提取的线谱所对应轴频或谐波次数不明确，最后算法通过序列匹配方法计算线谱对应的谐波次数，从而实现螺旋桨轴频的自动提取，通过实验验证，算法取得了较好效果。
Abstract
As it is difficult to extract the propeller shaft frequency of underwater acoustic targets automatically such as ships, submarines and so on, this paper proposed an extraction algorithm of propeller shaft frequency of underwater acoustic targets based on the average energy accumulation and pulse sequence matching.First, the algorithm enhanced the line spectrums of DEMON by fusing the modulated information of different frequency band with an improved multi-band fusion method.Then the line spectrums of the propeller shaft frequency or its harmonics was extracted by the average energy accumulation.Finally, the method of sequence matching was applied to calculate harmonic numbers of the line spectrums extracted, and the propeller shaft frequency was extracted automatically.As verified in the test, the algorithm works very well.
关键词
轴频提取 /
DEMON谱 /
平均能量累积 /
脉冲序列匹配
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