比相法是一种高精度的频标比对方法。
Phase comparison is a high precision comparing method for frequency standard.
此外，数字伺服还可在其它原子频标中应用。
Besides, digital servo system may also be applied to other frequency standards.
本文综合评述了光频标和光频测量研究的历史、现状和未来。
The history, present situation and future of optical frequency standards and optical frequency measurements were presented.
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