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Improvement of Frequency Locking Algorithm for Atomic Frequency Standards

2010; Institute of Physics; Volume: 49; Issue: 9R Linguagem: Inglês

10.1143/jjap.49.096601

1347-4065

Young Ho Park, Hoonsoo Kang, Soo Heyong Lee, Sang Eon Park, Jong‐Koo Lee, Ho Seong Lee, Taeg Yong Kwon,

Scientific Measurement and Uncertainty Evaluation

The authors describe a novel method of frequency locking algorithm for atomic frequency standards. The new algorithm for locking the microwave frequency to the Ramsey resonance is compared with the old one that had been employed in the cesium atomic beam frequency standards such as NIST-7 and KRISS-1. Numerical simulations for testing the performance of the algorithm show that the new method has a noise filtering performance superior to the old one by a factor of 1.2 for the flicker signal noise and 1.4 for random-walk signal noise. The new algorithm can readily be used to enhance the frequency stability for a digital servo employing the slow square wave frequency modulation.