A high accurate Rb atomic clock with the compensated techniques

Coefficient is one of the main factors which results in Rb clock to be as second frequency standard. Coefficient is from frequency shift mechanisms because of RF power, intensity of lamp light and collision between atoms in absorption cell. However, Rb clock has many advantages in Power dissipation, dimension and cost in comparison with H-maser and Cs beam. This paper shows a traditional Rubidium atomic clock with high frequency accuracy by 10 folders than ordinary Rb products while compensated techniques was added into the Rb clock. The compensated techniques are consisted of three steps. The first is dynamically regulating work temperature of lamp and cavity by the baseplate temperature; the second is taking 6.8GHz multiplier circuits with auto temperature compensation function. The final is employing digital embedded software in ADC, DAC and MCU to definitely regulate the frequency output by high order fitted cure. By the compensations, the coefficients 2E-11 below is realized within the range of -10~60°C per day. This Rb clock can be qualified to specifications of timing instruments in next generation Telecom.