Atomic frequency standard using digital processing in its freque

Details Atomic frequency standard using digital processing in its freque Atomic frequency standard using digital processing in its freque

1998-09-01

2000-10-10

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Molecular resonance stabilization

331 941, H03L 726

Patent

active

061305839

ABSTRACT:
A passive atomic frequency standard such as a Rubidium Frequency Standard or a Cesium Frequency Standard, using a microprocessor or equivalent circuit as part of its Frequency Locked Loop. The microprocessor phase modulates (pm) the RF signal which is introduced into the Atomic Resonator, and demodulates the output signal. The modulation and demodulation are performed by frequency hopping or spread spectrum techniques. Secondly, the microprocessor samples and integrates the error signal from the atomic resonator (Physics Package or Atomic Tube) with a sampled weighted- sum technique and thus better filters the noise, improves the Signal to Noise Ratio, rejects large noise like spikes, etc. Thirdly, the microprocessor saves the last control voltage of the Voltage Controlled Oscillator (VCO) to ease the start-up of the device as well as to keep the VCO at the last frequency in case the atomic resonator fails to function.

REFERENCES:
patent: 5606291 (1997-02-01), Verbanets
patent: 5852386 (1998-12-01), Chantry et al.

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