舰船噪声DEMON线谱的机器自动识别与轴频提取研究

Machine-based Auto-recognition and Extraction of Ship-radiated DEMON Spectrum

摘要:

DEMON 谱提取对于舰船目标识别有重要作用。研究了舰船噪声调制与解调原理，采用绝对值检波法提取 DEMON 谱，然后采用自动线谱识别与提取方法提取线谱序列，采用最大公约数法求线谱序列的基频，它是螺旋桨旋转的轴频。从实测舰船噪声数据中自动提取了 DEMON 谱，并得出其轴频，表明分析方法是有效的。

关键词:DEMON 谱;线谱;轴频估计

Abstract:

Extraction of ship-radiated DEMON(Detection of Envelope Modulation on Noise)spectrum is very important in the field of ship target recognition. The theory of ship-radiated noise modulation and de-modulation is studied，and the absolute value detection method is used to extract the DEMON spectrum. The line spectra sequence is extracted with the auto-recognizing and extracting method. Then the fundamental frequency of the line spectra， which is the shaft frequency of the propeller，is resolved with the greatest common divisor method. The processing results of sea trial data show that our method is effective.

Key words:DEMON spectrum;line spectrum;shaft frequency estimation