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宇宙通信和跟踪系统对稳定的频率源提出了严格的要求。“闪烁”(1/f)噪声和环境变化是影响典型的宇宙系统性能的振荡器的两个不稳定因素。列出了几种系统的例子以及各个系统对频率源的要求。依据具体试验,地球卫星系统对稳定度的要求在数秒到数小时时间内为10~(-10)。典型系统要求S波段12赫带宽接收机内的相位噪声小于5°均方根值。以宇宙飞行器应答机为例,在10赫到10千赫,峰值为3g的振动下,其相位噪声应低于45°峰峰值。
Space communication and tracking systems place stringent requirements on a stable frequency source. “Flashing” (1 / f) Noise and environmental changes are two unstable factors affecting oscillators of typical cosmic system performance. Several examples of systems are listed along with the requirements of each system for the frequency source. According to the specific test, the stability requirement of the earth satellite system is 10 ~ (-10) within several seconds to several hours. Typical system requirements Phase noise in S-Band, 12 Hz bandwidth receivers is less than 5 ° rms. Taking a spacecraft transponder as an example, its phase noise should be below 45 ° peak-to-peak at 10 Hz to 10 kHz with a peak of 3 g.