PROBLEM TO BE SOLVED: To provide a rubidium atomic oscillator which is hardly affected by ambient noises, superior in a short-term stability and phase noise characteristics, and capable of reducing a deterioration in its frequency stability, in a frequency-unlocked state to an irreducible minimum.;SOLUTION: A rubidium atomic oscillator is equipped with a crystal oscillator which generates a fixed frequency as atomic resonance frequency, a direct digital synthesizer(DDS) which receives the output of the crystal oscillator as a system clock and also tuning data corresponding to error signals generated corresponding to the resonance frequency and varies its output frequency, a frequency multiplexer which multiplexes and multiplies the output of the DDS and phase-modulates it with low-frequency signals, an atomic resonator which receives the output of the frequency multiplexer and detects the frequency difference between the output frequency of the multiplexer and the resonance frequency of rubidium atom, and a tuning data generating circuit which receives signals outputted from the atomic resonator and generates tuning data, corresponding to the signals where an oscillator output is generated by the DDS.;COPYRIGHT: (C)2002,JPO
展开▼
