基于相关特性船舶辐射噪声DEMON谱信噪比增强算法

摘要

Considering the uneven modulation feature,the ship radiated noise signal can be divided into different DEMON spectrum functions by time-domain delay and sub-band in frequency-domain.The average correlation coefficient curve of different DEMON spectrum functions and the optimum DEMON spectrum function are definition.A method,based on statistically significant correlation characteristic difference between modulation spectrum and interference spectrum of different DEMON spectrum functions,is put forward to improve SNR.The experimental results show that the method can improve the DEMON spectrum SNR and efficient of target recognition.%基于实测船舶辐射噪声信号的非均匀调制特性,通过时域延时和频域子带2种方式对同一船舶噪声信号进行不同DEMON谱函数的划分.定义不同DEMON谱函数间的平均相关系数和最优DEMON谱函数,提出一种基于不同DEMON谱函数的调制线谱与干扰的统计学相关特性差异来提高所得信号信噪比的算法.实验结果表明,该算法可以提高DEMON谱信噪比,有利于对目标的特征提取和分类识别.