基于WOSA法和MCOV法的目标噪声谱估计

ESTIMATION METHOD FOR RADIATED NOISE SPECTRA OF UNDERWATER TARGET BASED ON SPECTRUM EVALUATION

基于加权交叠平均法(WOSA)和修正协方差法(MCOV)的谱估计方法,研究了一种联合谱估计方法.该方法克服了周期图法谱估计起伏较大以及Burg方法存在谱线分裂或伪峰的缺点,兼顾了WOSA法不产生伪峰以及MCOV法可获得高分辨率的优点,可应用于水下目标的噪声谱估计.对于大量水下实测的噪声数据的分析表明,所提出的方法对水下目标的谱分析是可行且有效的,为便于比较,文中也给出了周期图法和Burg法估计的功率谱图.

This paper puts forward a estimation method for radiated noise spectra of underwater target based on weighted overlapped segment averaging （WOSA） method and modified covariance method （MCOV） in the complicated ambient-noise. Based on the spectral characteristics of target,the proposed method estimates the approximated scope of line spectra using WOSA method, then gains the precise value of line spectra, for easy comparing, the periodorgram and Burg estimation results are present. Experimental results on real-world data show that the methods are practical and effective.