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这是方便的、精确的、具有高分辨力的时域、频域测量方法。把振荡器想象为纯净的,单一频率的正弦波信号源。但是,绝对没有完美无缺的事物。现实世界上的频率源的输出,总是要受幅度变化和频率噪声,或频率不定性的影响。在以时间为基准或以频率为基准的系统中,其信息量基本上由参考振荡器或者时间发生器的稳定度来确定,如雷达距离分辨
This is a convenient, accurate, high-resolution time and frequency domain measurement method. Think of an oscillator as a pure, single-frequency sine wave signal source. However, there is absolutely no perfect thing. The output of a frequency source in the real world is always affected by amplitude variations and frequency noise, or frequency uncertainty. In a time-based or frequency-based system, the amount of information is basically determined by the stability of the reference oscillator or time generator, such as radar distance resolution