原子钟调相白噪声降噪方法

摘要

原子钟的五种噪声反映了它在一定时间间隔内的性能.当取样间隔小于1h,原子钟主要表现为调相白噪声.在地方协调时UTC(NTSC)的实时监控中,不仅要求参考原子时(RTA,用于地方协调时控制的参考)具有很高的长期稳定度,而且要求其短期稳定度亦很高.影响RTA短期稳定度的主要是个台原子钟的调相白噪声.首先讨论了确定原子钟短期噪声的方法,进而利用小波分析方法研究了原子钟调相白噪声分离与降噪的方法.%The 5 type of noise of an Atomic Clock show its performance in different sampling interval. When the sampling interval is less than 1 hour,the noise of an atomic is mainly white noise PM. As-monitoring the UTC ( NTSC ) , both the long term and short term stability of Reference Atomic Time ( RTA ) should be very good. However, the main factor affecting the short term stability of an atomic is the whitenoise PM ,so it is necessary to study how to reduce the white noise PM. In this paper, the wavelet filter andsmoothing method are used, and the result shows that it is a valid method processing the atomic data.