... frequency selective surface 频率选择表面 frequency standard comparison 频标比对 frequency-selective channels 频率选择性信道 ...
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The actual test data indicates that the accuracy of frequency measurement can reach up to 10~(-11)/s order of magnitude and frequency standard comparison 10~(-11)/s order of magnitude.
实际测试的数据表明,频率测量精度可达10~(-11)/s量级,频标对比精度达到10~(-11)/s量级。
参考来源 - 精密时频测量和控制技术研究·2,447,543篇论文数据，部分数据来源于NoteExpress
Finally, the paper makes comparison and choice of the evaluating standard of the power frequency electric field, and brings forward more objective standard.
最后，本文对工频电场的评估标准进行了比较与选择，并提出了较为客观的依据标准。
Phase comparison is a high precision comparing method for frequency standard.
比相法是一种高精度的频标比对方法。
The comparison table of modern practical atom clock's performance index is given. The index of transferring and comparing standard time-frequency signal by modern radio means is also listed.
给出了现代实用型原子钟的性能指标比较表，和用现代无线电手段传递、比对时频标准信号达到的指标。
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