基于信噪歪度比的二次相位耦合信号增强新算法
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,在这个分析法中用三阶累积量切片首次定义了信噪歪度比的概念，导出了其理论计算公式。从理论分析可知：当背景噪声为对称分布噪声时，信噪歪度比为无限值；当背景噪声为非对称分布噪声时，在一定条件下，其大于等于输入信噪比。理论分析和仿真结果表明：用三阶累积量切片从非高斯非对称分布的噪声中提取二次相位(动态)耦合信号是有效的，且无需对背景噪声的分布作任何假定。这在工程实践中是非常有意义的。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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