同频干扰对相关值计算的影响

Effect of same frequency interference on correlation value computation

为研究同频干扰对相关值计算的影响,以周期信号为研究对象,建立了相关值计算模型。根据信号模型,从理论上分析了同频干扰影响相关值计算的机理。通过仿真实验,总结信号分别为单个频率成分和多个频率成分时,由同频干扰引起的相关系数峰值误差随同频干扰成分的幅值及其与源信号的相位差(0°~360°)的具体变化规律。结果表明:相关系数峰值误差变化趋势关于相位差180°对称分布,且同频干扰分量幅值在信号中所占比例越大,相关系数峰值误差也越大。

To study the effect of same frequency interference on correlation value computation, correlation analysis model is set up with periodic signals as the researching object, based on which the effect mecha- nism of the same frequency interference on correlation value computation is analyzed theoretically. Through the simulation experiments of single-frequency and multi-frequency signals, the specific changing rule of correlation coefficient peak value error caused by same interference components are summarized following the amplitude of identical interference components and the phase difference （0° -360°） between original signal and same interference components respectively. It is found that the variation trend of correlation coefficient peak value error is symmetrically distributed by phase difference （180°） , and cor- relation coefficient peak value error become more under the condition of the higher proportion of the amplitude of same interference in signals.