Time service terminal and time service system and method thereof

The invention discloses a time service terminal and a time service system and method thereof, which are applied to the technical field of time synchronization, and the time service system comprises a first atomic clock, a second atomic clock, a control device, a rubidium atomic clock and a time frequency generator. The time service method is applied to the control device and comprises the following steps: selecting a main reference clock signal from a first reference clock signal and a second reference clock signal according to a preset selection rule; judging whether the satellite signal is valid; if yes, controlling the rubidium atomic clock to track satellite signals; if not, the rubidium atomic clock is controlled to track the main reference clock signal, and the compensation amount used for offsetting the deviation between the main reference clock signal and the satellite signal is determined; and sending the compensation amount to a time frequency generator to compensate the output of the rubidium atomi