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氢原子频标的微波谐振腔输出的是一极其微弱的(W~(-13))氢脉泽微波信号,其微波频率为1420 405 751 Hz,是无法被直接利用的,需经精细放大和一系列的倍频、混频等频率合成后方能获得应用,更重要的是在微波放大、倍频、混频及传递过程中,必须严格保持相位相干。任何非线性都将产生相位噪声而影响其频谱特性,终将破坏氢原子频标的技术指标。根据研制生产、使用维修、调测工作过程与实践,对氢原子频标中相位相干的微波倍频链系统噪声进行了较详细的分析与讨论。
The output of a microwave cavity with a hydrogen atomic frequency standard is an extremely weak (W ~ (13)) hydrogen maser microwave signal whose microwave frequency is 1420 405 751 Hz and can not be directly used and needs to be finely amplified and a Series of frequency doubling, mixing and other frequency synthesis can be obtained after the application, more importantly, microwave amplification, frequency doubling, mixing and transmission process, we must strictly maintain the phase coherence. Any non-linearity will produce phase noise and affect its spectral characteristics, will eventually destroy the technical indicators of hydrogen atomic frequency standard. According to the research and development, production, maintenance, and commissioning process and practice, the phase noise coherence microwave frequency multiplication chain system noise in hydrogen atomic frequency standard was analyzed and discussed in detail.