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1) For miniaturizing the optical-microwave unit of 87Rb atomic frequency standard, various possible schemes of optical pumping devices with two bubbles are investigated and discussed.

2) With the development of quanta frequency standard, the precision of method of time server cannot be satisfied again.

3) Finally, the developing trend of time and frequency standard optical clock is briefly looked ahead.

4) Analyses failures of XSR type of Rubidium atomic frequency standard used in our factory, and introduces the situation of particular overhaul in detail.

5) The development of optical frequency comb in optical frequency standard is presented.

6) Considering influence of external vibration on ultra-low frequency standard vibration systems, the vibration insulating foundation for vibration tables and a laser vibrometer is studied.

7) For a hydrogen atomic frequency standard. Measurement of it's stability, especially real-time stability, cavity tuning and line Q must be done.

8) Atomic Frequency Standard is the frequency and time benchmark of space technology and time awarding system , directly determining the quality of satellite communications.

9) The atomic hydrogen maser is the most stable frequency standard generally available today for all but the shortest measuring time interval.

10) The principle and technical characteristic of GPS based frequency standard is presented, and the uncertainty factors and calibration methods of GPS based frequency standard are also provided.

11) The high accurate and zero-drift GPS based frequency standard is widely applied in mobile telecommunication, Digital Video Broadcast(DVB), metrology and calibration etc.

12) The atomic hydrogen maser is the most stable frequency standard allshortest measuring time interval.

13) The cesium atomic fountain used laser cooling and trapping is a new generation primary frequency standard.

14) This paper introduces the evaluation of measurement uncertainty of cesium atomic beam frequency standard, and gives its calculation process and expression method.

15) In order to get rid of the dependence on other countries and establish self-governed time and frequency standard, the research on atomic frequency standard is imperative under the situation.

16) Indicated the good result of the long-term operation of the optically pumped cesium beam frequency standard in China.

17) Meanwhile, we take some improvement measure in order to improve the rubidium atomic frequency standard.

18) The satellite carrying master oscillator (SCMO) is non-coherent with the frequency standard at the ground tracking station in the non-coherent Doppler system.

19) A programmable divider used in frequency synthesizer of Rb frequency standard is designed,[http://sentencedict.com/frequency standard.html] and the improvement of programmable divider is introduced.

20) Voltage controlled crystal oscillator(VCXO)plays an important roll in the atomic frequency standard.

21) A construction layout about flexible, convent, new type, multi parameter, high accuracy, large volume data acquisition system for the Rubidium atomic frequency standard test is put forward.

22) This cavity-cell assembly can be used to make a miniaturized rubidium atomic frequency standard with high performance.

23) The formula of waveform distortion is obtained by the approximate result expression of nonlinear equation about ultra low frequency standard vibrator with this kind of emulsion pipe spring.

24) A high-order microwave frequency multiplier is designed by adopting the step recovery diode for a passive rubidium atomic frequency standard.