The Rubidium clock is also called the Rubidium atomic clock. The Rubidium frequency standard is a passive atomic frequency that uses the transition between the ground state hyperfine energy levels. The Rubidium atomic clock consists of a Rubidium quantum part and a voltage-controlled crystal oscillator. The short-term stability of the Rubidium atomic frequency standard can reach up to 10-12, with an accuracy of ±5×10-11. It has the characteristics of small size and high precision.

The Rubidium clock is also called the Rubidium atomic clock. The Rubidium atomic clock consists of a Rubidium quantum part and a voltage-controlled crystal oscillator. The frequency of the voltage-controlled crystal oscillator is sent to the quantum system for comparison with the Rubidium atomic transition frequency after frequency multiplication and frequency synthesis. The error signal is sent back to the voltage-controlled crystal oscillator, and its frequency is adjusted to lock it to the frequency corresponding to the unique energy level transition of the Rubidium atom. The short-term stability of the Rubidium atomic frequency standard can reach up to 10-12, with an accuracy of ±5×10-11.

The rubidium frequency standard does not require a vacuum system, a deflection magnet, or an atomic beam, so it is small in size, small in mass, has a short warm-up time, and is cheap, but has poor accuracy and relatively large frequency drift, and can only be used as a secondary standard. The rubidium frequency standard can be quickly disciplined and externally synchronized through GPS to overcome the drift of the rubidium oscillator itself, and can be regarded as a basic synchronous clock unit. Through improvements in design and process, the reliability and mass production of the product are also guaranteed, and the conditions for industrialization are now met. It can be expected that this high-performance miniaturized rubidium clock with external-second discipline will be used in harsh environments such as unmanned operation, which will greatly expand the application field of rubidium clocks.