中文摘要：

首先对NTSC（National Time Service Center）守时实验室的氢原子钟进行了测试，为了规避铯原子钟噪声较大的影响，没有采用TA（k）或UTC（k）作为参考，而是以4台氢原子钟互为参考进行测试，利用四角帽法对氢原子钟的频率稳定度进行分析，估计出单台氢原子钟在不同取样时间上的Allan标准差．然后根据氢原子钟的特性，扣除趋势项，剔除异常值，利用数学方法平滑，分离出了氢原子钟的高斯噪声，并且通过了Kolmogorov-Smirnov检验，估计出单台氢原子钟高斯噪声．

英文摘要：

In this article, the hydrogen masers were tested in NTSC （National Time Service Center） keeping time laboratory. In order to avoid the impact of larger noise of caesium atomic clocks, TA（k） or UTC（k） was not used as reference, and four hydrogen masers were mutually referred and tested. The frequency stabilities of hydrogen masers were analyzed by using four-cornered hat method, and the Allan standard deviation of single hydrogen maser was estimated in different sampling time. Then according to the characteristics of hydrogen masers, by removing the trend term, excluding outliers, and smoothing data with mathematical methods to separate the Gaussian noise of hydrogen masers, and finally through the normal KolmogorowSmirnov test, a single hydrogen maser＇s Gaussian noise has been estimated.