High-performance rubidium clocks are mainly used in the national defense military industry, mainly highlighting the requirements of performance indicators and product reliability. At the same time, they should also have the characteristics of easy operation, complete functions, and strong versatility. The parameters of its main functions and performance are as follows:

1.Frequency Stability

Frequency stability is the fluctuation of frequency deviation, which is actually a problem that can be studied and processed by random processes (stable or unstable). The mathematical representation of frequency stability in the time domain is the Allen standard deviation.

2.Monthly Frequency Drift Rate

When the atomic frequency standard works continuously, the degree of slow change of frequency in one direction over time is estimated by the least squares method. The drift of the rubidium atomic clock can be changed by GPS locking. The monthly drift of the rubidium atomic clock is: 1×10-11～4×10-11.

3.Frequency reproducibility

Frequency reproducibility refers to the consistency between the relative average frequency deviation of the rubidium frequency standard after it is turned on for a period of time, then turned off for a period of time, and then turned on for a period of time, and the relative average frequency deviation when it is turned off. Generally: 1×10-11～5×10-11 .

4.Frequency Accuracy

Frequency accuracy refers to the maximum range of frequency deviation, indicating the degree to which the actual frequency value is close to the nominal value. It is quantitatively expressed in numerical values without positive or negative signs, generally: 5×10-11～5×10-12 .