基于信噪歪度比的二次相位耦合信號(hào)增強(qiáng)新算法
Novel Method Based on Signal-to-Noise Skew Ratio for Enhancing Quadratic Phase Dynamic Coupling Signals
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摘要: 提出了信噪歪度比分析法,在這個(gè)分析法中用三階累積量切片首次定義了信噪歪度比的概念，導(dǎo)出了其理論計(jì)算公式。從理論分析可知：當(dāng)背景噪聲為對(duì)稱分布噪聲時(shí)，信噪歪度比為無限值；當(dāng)背景噪聲為非對(duì)稱分布噪聲時(shí)，在一定條件下，其大于等于輸入信噪比。理論分析和仿真結(jié)果表明：用三階累積量切片從非高斯非對(duì)稱分布的噪聲中提取二次相位(動(dòng)態(tài))耦合信號(hào)是有效的，且無需對(duì)背景噪聲的分布作任何假定。這在工程實(shí)踐中是非常有意義的。Abstract: Signal-to-Noise SKew Ratio (SNSKR) is defined and its mathematical formula is obtained. A novel analysis based on the SNSKR is presented. When ambient noise is asymmetrical distributed noise, the SNSKR is equal to or greater than the original Signal-to-Noise Ratio(SNR); whereas the SNSKR is theoretically infinite value if ambient noise is symmetrical distributed noise. Theoretic analysis and simulation results have shown that the analysis is valid and that it is unnecessary to assume that the ambient noise is Gaussian distribution or asymmetrical distribution when employing third-order cumulant slices extracts the underwater target-radiated quadratic phase dynamic coupling signals. These conclusions are significance in engineering.
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