基于MOF准则的原子钟噪声分离研究

Research on Atomic Clock Noise-separation Based on MOF Criteria

按照MOF(the Method of Frame)准则,对原子钟信号进行噪声分离,并应用阿伦方差对基于不同小波字典的噪声分离结果进行评价。试验结果表明,应用余弦(DCT)字典、余弦包(CP)字典、Sym8小波包(WP)字典进行噪声分离后的阿伦方差分别从原始信号的4.5538e-15提高到2.2100e-15,3.3125e-15,8.2848e-16,说明MOF准则下,选取适当的小波字典对原子钟信号进行噪声分离,能够获得很好的稳定度。

In this study noise in atomic clock signals is separated according to MOF （the Method of Frame） criteria, and the Allan variance is applied to appraise the noise-separation result attained by dif- ferent wavelet dictionary. It is shown that the Allan variance of the noise-separation results applied DCT dictionary, CP （Cosine Packet） dictionary and WP （Wavelet Packet） dictionary, is improved from the origin of 4. 5538e-15 to 2. 2100e-15,3. 3125e-15 and 8. 2848e-16, respectively. Indicate that during the process of separating the noise in atomic clock signal under MOF criteria, if we can choose appropriate wavelet dictionary, the noise-separation result will be provided with excellent stability.