AM信号数字解调在原子钟误差处理中的应用探讨

Application of Digital Demodulation of AM Signal in Error Processing of Atomic Clcok

目前所有的原子频标都是基于原子或者离子的共振跃迁而实现的,利用了量子能级间跃迁的标准频率。在我国目前得到大量工程应用的微波原子钟之一为氢脉泽原子钟,其拥有异常出色的长期频率稳定度。精确地测定原子的频率,则需要对氢脉泽信号进行处理。由此引出探讨一种方法,是如何将基于被动型双频探测机理的氢脉泽信号,以及原子钟相应的微波腔频率控制信号通过数字解调的方式提取出来,经过数模采样后通过软件算法反馈实现伺服控制,锁定后输出稳定基准频率源。

At present,all atomic frequency standards are based on the resonant of atoms or ions,and use the standard frequency of quantum energy level transitions.One of the microwave atomic clocks widely used in China is the hydrogen maser atomic clock,which has excellent long-term frequency stability.To accurately measure the atomic frequency,it is necessary to precess the hydrogen maser signal.A method discussed in this paper is how to extract the hydrogen mase signal based on the passive dual frequency detection mechanism and the corresponding microwave cavity frequency control signal of the atomic clock through digital demodulation,and then realize servo control through software algorithm feedback after digital and analog sampling,and output a stable reference frequency source after locking.