穩(wěn)定分布的水聲信號(hào)處理新方法
A New Underwater Acoustic Signals Processing Approach to a-Stable Distribution
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摘要: 本文依據(jù)分?jǐn)?shù)低階統(tǒng)計(jì)信號(hào)處理理論和艦船輻射噪聲信號(hào)特性,提出了水聲信號(hào)新的噪聲模型,分析了常規(guī)LMS濾波方法在非高斯穩(wěn)定分布噪聲下性能退化的原因,提出了基于分?jǐn)?shù)低階p-范數(shù)的LMP,NLMP水聲信號(hào)自適應(yīng)降噪濾波方法,并分析了參數(shù)p值的選取對(duì)LMP濾波效果的影響.理論分析和計(jì)算機(jī)仿真結(jié)果表明這種方法在高斯和非高斯穩(wěn)定分布條件下都具有良好的魯棒性.Abstract: According to the theory of the fractional lower order statistical signal processing and the characteristics of ship radiated noises, this paper proposes a new noise model of underwater acoustic signals. The reasons of performance degenerate are analyzed for traditional LMS approach. A new replace approach is advanced to adaptive filtering based on fractional lower order moments for underwater acoustic signals. It is analyzed how to affect the performance of LMP algorithm for choosing p value. Theoretic analysis and computer simulations indicate that the new method is not only suitable for Gaussian noise conditions, but also very robust under the lower order -stable distribution noise conditions.
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