基于信噪比分析的被动氢钟输入功率研究
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摘要
针对氢原子能级跃迁的特性,提出一种基于系统信噪比寻找最佳输入功率点以提高原子跃迁信号性能的方法。利用数字频率合成器得到探测信号并导入氢钟谐振腔中获得谐振腔与氢原子跃迁的特性,再将氢钟物理输出信号通过基于现场可编程门阵列的电路系统中进行处理。在MATLAB平台上,计算得出不同输入功率下的氢原子跃迁信号带宽与系统信噪比关系,找出最佳输入功率点以提高氢原子跃迁信号的性能。
By using the characteristics of hydrogen atom level transition, a method based on system signal-to-noise ratio(SNR) is proposed to find the optimal input power point for improving the performance of atomic transition signal. The characteristics of the resonance cavity and the hydrogen atom transition are obtained, by introducing the signal which is detected in the digital frequency synthesizer into the hydrogen clock cavity. Then, the hydrogen clock physical output signal is processed through the circuit system based on the field programmable gate array. By using the MATLAB platform, the relationship between the bandwidth of the hydrogen atom transition signal and the system signal-to-noise ratio at different input powers is calculated, and then, the optimal input power point is found to improve the performance of the hydrogen atom transition signal.
By using the characteristics of hydrogen atom level transition, a method based on system signal-to-noise ratio(SNR) is proposed to find the optimal input power point for improving the performance of atomic transition signal. The characteristics of the resonance cavity and the hydrogen atom transition are obtained, by introducing the signal which is detected in the digital frequency synthesizer into the hydrogen clock cavity. Then, the hydrogen clock physical output signal is processed through the circuit system based on the field programmable gate array. By using the MATLAB platform, the relationship between the bandwidth of the hydrogen atom transition signal and the system signal-to-noise ratio at different input powers is calculated, and then, the optimal input power point is found to improve the performance of the hydrogen atom transition signal.
引文
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[2] ZHENG H,LI J,WANG W,et al.Analysis of single frequency modulation for passive hydrogen maser[J].Journal of Systems Engineering and Electronics,2017,28(4):661-668.
[3] 王勇.被动型氢原子钟若干关键技术研究[D].南京:东南大学,2014.
[4] 帅涛,谢勇辉.导航卫星星载氢原子钟[J].科学,2016,68(5):11-15.
[5] 李玉莹,刘铁新.利用数字伺服实现被动型氢钟单频锁定[J].宇航计测技术,2011,31(2):31-33.
[6] 孙岩君.扫频法测量音频系统频率响应的原理及实践[J].电声技术,2006(6):80-82.
[7] 谢勇辉,林传富.被动型氢原子钟原子跃迁谱线特性分析[J].中国科学院上海天文台年刊,2011(1):102-106.