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The NAC1 (“Nano-Atomic-Clock”) is a miniature, high reliability, CPT-based Rubidium Atomic clock. Its basic design and features were described in a previous paper. This paper provides further details and updates on the clock. In particular we focus on medium-term and long-term stability issues that are key parameters in commercial atomic clocks, as well as the wide temperature operational range and...
In Nordic and Baltic countries there are several national and other time & frequency laboratories having atomic clocks. The accuracy ot the time is mostly based on factory calibrated GPS receivers without knowledge on the effect of local cabling and other delays. Thus the time error could easily be 10 ns or more. To improve the situation, an Euromet project 860 was started. At the same time an...
Frequency aging in the rubidium (Rb) vapor-cell atomic clock plays a significant role in the device's timekeeping ability. Though many researchers have speculated on the physical mechanism(s) driving the linear, deterministic frequency change (i.e., /spl Delta/f(t)/f/sub o/ = At), there is little unambiguous experimental data regarding the phenomenon. Here, long-term data were used from on-orbit global...
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