调幅信号谱相关密度分析中白噪声影响的研究  

INFLUENCE OF THE NOISE ON SPECTRAL CORRELATION DENSITY ANALYSIS OF AM SIGNAL

作　　者：毕果[1] 陈进[1] 周福昌[1] 何俊[1] 李富才[1] 

机构地区：[1]上海交通大学振动,冲击,噪声国家重点实验室,上海200240

出　　处：《振动与冲击》2006年第2期75-78,共4页Journal of Vibration and Shock

基　　金：国家自然科学基金资助项目(50175068);国家自然科学基金重点资助项目(50335030)

摘　　要：重点研究了加性高斯白噪声对调幅信号谱相关密度分析结果的影响。平稳信号的谱相关密度仅存在于频率轴上,但是由于谱相关密度分析为非线性二次变换,信号和噪声的交叉项也将干扰分析结果。本文通过对加性高斯白噪声干扰的调幅信号的理论分析,得到了加性噪声干扰在谱相关密度双频率平面上的分布特点,总结了该类型循环平稳信号谱相关密度图的分布规律,最后利用仿真信号验证了理论分析的正确性。The paper is dedicated to study the influence of the additive Gaussian White Noise on the Spectral Correlation Density (SCD) analysis of Amplitude Modulated (AM) signals. The values of SCD of the stationary signals are equal to zero except those on the frequency axis, but because of the nonlinear quadratic transformation in SCD analysis, the cross components between signals and noise also disturb the result. According to the analysis of AM signals in additive Gaussian White Noise, the distribution characters of the additive noise disturbance are achieved, and the general rules for this kind of cyclostationary signals in SCD analysis are summarized. Emulating signal is used to validate the correctness of the theory.

关 键 词：循环平稳 谱相关密度 高斯白噪声 幅调制信号 

分 类 号：TP206[自动化与计算机技术—检测技术与自动化装置] TP911[自动化与计算机技术—控制科学与工程]