摘  要：从识别潜艇的需求出发，分析了潜艇螺旋桨噪声线谱的基本特性，指出潜艇螺旋桨轴频是识别潜艇的有力依据。使用短时傅立叶变换(STFT)分析法来提取潜艇螺旋桨噪声的离散特征线谱，仿真结果表明，该方法简单有效。研究了潜艇螺旋桨轴频估计的特点，为提高潜艇螺旋桨轴频估计的性能，在得到潜艇辐射噪声的时频分析图后，先将线谱与连续谱分离，再检测螺旋桨噪声线谱并进行净化，并提出了一种潜艇螺旋桨轴频估计方法。
关键词：轴频估计；特征线谱；潜艇螺旋桨
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Estimation for Shaft Rate of Submarine Screw Propeller Based on Extraction of Characteristic Line Spectrum

 
Abstract: On requirement of submarien recognition, elementary characteristics of line spectrum of submarine screw propeller noise was analysed, and it was confirmed that shaft rate of submarine screw propeller is convincing evidence to recognize submarine. STFT was used to extract discrete characteristic line spectrum of submarine screw propeller noise, which was proved to be effective by simulation experiment. Then, characteristics of estimation for shaft rate of submarine screw propeller were studied. For improving performance of estimation for shaft rate of submarine screw propeller, line spectrum and continuous spectrum are separated firstly after time-frequency analysis diagram is got, then, line spectrum of screw propeller noise is detected and purified. At last, a method for estimating shaft rate of submarine screw propeller was advanced.
Key Words: shaft rate estimation; characteristic line spectrum; submarine screw propeller