FIELD: physics.
SUBSTANCE: method of storing the frequency of electric oscillations with a frequency measure can be used when creating precision frequency and time standards. Method consists in measuring the initial deviation of the measure frequency from the reference frequency at a certain initial interval T0. At the end of interval T0, the measurement frequency is corrected by the value of the measured initial deviation, and further during a certain time interval T, the frequency of the measure signal is further divided, two-channel analogue-to-digital conversion of a measure signal in main frequency and divided frequency channels with a time sampling interval determined by the frequency of the sampling signal generated from the measure signal. Transformations of the obtained digital samples U1(k), U2(k) into quadrature components of complex signals of the fundamental frequency channel U1s(k), U1c(k) and the shared frequency channel U2s(k), U2c(k), where k=0, 1, 2, 3…, – current number of samples. Determining the phase ϕ1(k) of the fundamental frequency channel signal and ϕ2(k) of the divided frequency channel signal as complex number arguments in accordance with expressions ϕ1(k)=tg-1(U1s(k)/U1c(k)) and ϕ2(k)=tg-1(U2s(k)/U2c(k)). Phase difference is determined Δϕ1(k)-ϕ2(k) and calculating current value of measure frequency correction β(k)=-ƒ0Δϕ(k)/πjk. Values are compared β(k) with threshold βthr, where βthr is the resolver power of the measure frequency, and correction of the measure frequency is carried out by the value – β(kthr), where kthr is the value of current sample number, at which |β(k)|≥βthr.
EFFECT: technical result consists in reduction of frequency error due to frequency drift of frequency of frequency measure.
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