一种非连续微波探询信号的实现

A Scheme for Generating Discontinuous Microwave Inquiry Signal in Rubidium Atomic Frequency Standard

铷原子频标(RAFS)的微波探询信号可用于激励铷原子产生基态能级之间的跃迁,从而实现共振探测.目前常用的微波产生方案都存在电路结构复杂、功耗大、不便于集成的缺点.本文提出了一种利用锁相环(PLL)技术产生非连续微波探询信号的设计方案,这种方案以10MHz信号作为参考频率,在单片机的合理配置下可直接得到(6834.6875 MHz±fM)信号(fM表示最大频偏).该方案具有电路结构简单、功耗低、数字化程度高等优点,利用该方案实现的整机稳定度优于1.5E-11/√τ(1s≤τ≤100s,性能指标均可满足小型商业铷原子钟要求.

The microwave probing signal of the rubidium atomic frequency standard(RAFS)is used to excite the transitions between the ground-state energy levels of rubidium atoms,and realize resonance detection.At present,the microwave generation schemes commonly used all have the disadvantages of complicated circuit structure,high power consumption and inconvenient integration.This work introduces a design scheme for generating discontinuous microwave inquiry signal using the phase-locked loop(PLL)technology.The scheme takes the 10 MHz signal as a reference frequency,and is capable of obtain the(6834.6875 MHz±fM)signal directly under a reasonable configuration of single chip microcomputer.The scheme has the advantages of simple circuit structure,low power consumption and high digitization.The stability of the whole machine was found to be better than 1.5E-11/√τ(1s≤τ≤100s.The performance indexes can meet the requirements of small commercial rubidium atomic clock.