摘要
CPT原子钟应用Rb85原子的相干布居囚禁原理,避免了厘米量级的微波谐振腔,使得原子钟的微型化成为可能。采用传统采样比较方式,频率稳定度在百秒稳之后难以驯服。本文介绍了一种以FPGA为主控模块的新型CPT原子钟,并用DFT算法改进了锁定方式提高了系统的抗噪声能力,最后给出了样机测试结果,其千秒稳达到1.96×10-11。
CPT atomic clock applys the coherent population trapping principle of 85Rb atom,avoiding centimeter-level microwave resonant cavity,and enable the micromation of atomic clock.With tradition al sampling comparision method,frequency stability is difficult to tamed after hundred se cond.This paper introduces a new CPT atomic clock based on a host system using FPGA.Anti-noise ability of the system is enhanced by using DFT algorithm to improve lock mode.As the prototype test resu lt presented,the stability at one thousand second can reach 1.96×10-11.
出处
《电子测试》
2015年第1X期54-56,共3页
Electronic Test
关键词
相干布居囚禁
原子钟
DFT算法
稳定度
Coherent population trapping(CPT)
Atomic clock
DFT algorithm
Stability
