对于很是切确的测量，能够思忖选择切确的频率基准。
To very accurate measurement, can consider to choose accurate frequency fiducial.
该方法将GPS作为频率基准，间接得到了铷钟相对于与GPS的频差，避免了使用昂贵的高分辨计数器。
In the method, GPS is looked on as reference and the frequency difference between the Rb clock and GPS may be obtained indirectly, and the expensive high-resolution counter may not be needed.
这就是众所周知的铯原子钟的基础，它是目前的频率和时间基准。
This is the basis for the well - known cesium clock, presently the standard of frequency and time.
固定频率源可以在在通讯系统和雷达系统中作为本机振荡器，也可以作为数字电路的基准时钟信号，因此得到了广泛的应用。
Single frequency source is usually used as local oscillator in communication system and radar system, also as a reference clock in digital circuits, so it is a extensive-applied technique.
原子频标是空间技术和授时系统的频率与时间基准，直接决定了卫星通信的质量。
Atomic frequency Standard is the frequency and time benchmark of space technology and time awarding system, directly determining the quality of satellite communications.
通过分析可知，只要晶振频率足够高，生成的基准信号就有足够高的精度，而且信号的参量具有良好的可调节性。
Analysis result shows that the reference signal can be highly precise and provide an adjustable performance if the given frequency of crystal is high enough.
这些信号分别为模拟回波信号的生成提供了天线增益大小、时间基准、相位基准和载波频率大小等重要的参考信息。
These signals provide an important reference of the gain of antenna, the time reference, the phase reference and the frequency of carrier wave for generating stimulant echo signal.
相位频率检测器比较基准时钟信号和反馈时钟信号从而在一个或更多个输出信号中生成脉冲。
A phase frequency detector compares a reference clock signal to a feedback clock signal to generate pulses in one or more output signals.
当基准和反馈时钟信号的相位和频率相同时，PLL处于锁定模式，且PFD输出信号中不生成脉冲。
When the phase and frequency of the reference and feedback clock signals are the same, the PLL is in lock mode, and the PFD does not generate pulses in its output signals.
该系列定时器采用高精度同步电机为动力源，以电源频率为时间基准。
This series adopt high accurate synchromotor as power source and take power supply frequency as time datum.
该系列定时器采用高精度同步电机为动力源，以电源频率为时间基准，在30分钟至24小时内有多种规格的定时范围。
This series timers adopt high accurate synchromotor as power source and take power supply frequency as time datum. There are many specifications in time setting from 30 min. to 24 hours.
频率比较器比较基准时钟和输出时钟的频率，并输出频率比较信号。
A frequency comparator compares the frequency of a reference clock with that of an output clock and outputs a frequency comparison signal.
不以时间作为采样的基准，而以信号的幅度作为采样的基准，实现了对包含多种频率成分的复杂信号的多采样率。
This method does not use the time variable as reference but is based on the amplitude of the signal. It can get the multirate sampling for complex signals.
通过对修正前后模型模态频率与基准模型模态频率在测试频段内外的对比，证实了修正后模型具有良好的复现能力和预测能力。
A comparison of the modal frequencies of the non-updated and updated FEM and the benchmark FEM proves the reappearance and prediction ability of the updated FEM.
频率合成技术，就是将一个(或多个)基准频率变换成一个(或多个)合乎质量要求的所需频率的技术。
The frequency synthesizes a technique, be become a basis frequency tra formation a (or many) conforms to a quality request of the technique of frequency needed.
频率合成技术，就是将一个(或多个)基准频率变换成一个(或多个)合乎质量要求的所需频率的技术。
The frequency synthesizes a technique, be become a basis frequency tra formation a (or many) conforms to a quality request of the technique of frequency needed.
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