修正的阿伦方差对调相闪烁噪声的抑制

在时频领域内，普遍采用阿伦方差来表征频率稳定度，但阿伦方差对于调相闪烁噪声的抑制能力有其本身算法的缺陷。提出了用修正阿伦方差来表征频率稳定度，以降低噪声对频率稳定度的影响。分析并研究了修正的阿伦方差对调相闪烁噪声的抑制机理。通过卫星共视时间比对试验，对氢原子钟与原子时标国家计量基准的比对数据进行评估，利用噪声模型对评估结果进行论证。验证了修正阿伦方差对于调相闪烁噪声抑制的有效性。

Study on the inhibition effect of modified Allan variance on Flicker PM noise

In the time and frequency field, Allan variance is utilized in general to indicate frequency stability. Allan variance can not inhibit Flicker PM effectively because it′s defective algorithm. In order to reduce the impact of noise on frequency stability, frequency stability should be indicated by modified Allan variance. Modified Allan variance for inhibition mechanism of Flicker PM is analyzed. Through the satellite common view method, the comparative data of hydrogen clock and UTC(NIM) are evaluated. Then, the noise model is used to demonstrate the results of evaluation. The effectiveness of the modified Allen variance against Flicker PM inhibition is verified.