【摘要】 处理随机信号通常使用现代谱估计方法,但是这种方法一般只能处理平稳的高斯信号,使用高阶谱分析可以克服这些缺陷。利用现代谱估计法和高阶谱法分别估计原子钟数据的功率谱,并对功率谱进行拟合,可分析原子钟的噪声特性。理论分析及实验结果表明,高阶谱分析能有效处理实际信号中的非平稳非高斯问题。更多还原

【Abstract】 Modern spectral estimate is generally used to process the random signal.But only stationary Gaussian signal can be processed by this method.Using the higher order spectral analysis can overcome these defects.The modern spectral estimate and higher order spectral analysis are utilized to estimate the spectrum of the atom clock data respectively,and the noise characteristic is analysed by fitting to the spectrum of the atom clock.Theory analysis and experimental result indicate that the higher order spectral analysis can deal effectively with nonstationary and non-Gaussian problems in the actual signal.更多还原