METHOD FOR AUTOMATIC STABILIZATION OF THRESHOLD FREQUENCY CROSSING FREQUENCY BY NOISE PROCESS EMISSIONS Russian patent published in 2020 - IPC H04B1/10 

FIELD: physics.

SUBSTANCE: invention relates to the reception of signals, in particular to the equipment for extraction of signals from noise. According to disclosed method of automatic frequency stabilization f of threshold level crossing by noise emissions by adjustment of threshold level depending on frequency of its excess noise process, method includes determining, in advance, frequency f₀ of the noise process of the zero threshold level and a maximum root-mean-square value of the σ_max noise process, establishing an initial threshold level U₁ < mσ_max, where m < (U₁/σ) is a preliminary estimate of the required threshold/noise ratio in the stabilization mode, to which frequency f₁ exceeds the noise level of U₁ level and reduces the frequency f to a stable value f₀ > f₂ > f_p , where f_p - required frequency f in operating mode, by increasing the threshold by a value ΔU after each exceeding by its noise until the threshold reaches the stable level U₂, after which number N₂ of threshold excess is counted with noise emissions during the time of averaging T₂, at the end of this time at moment t₃ recording value N₂, define the frequency of noise emissions f₂ = N₂/T₂ and sets the operating threshold value T₂ set by condition N₂ > 1/δ²_N, where δ_N is the limit deviation of the amount of noise excess of the threshold level from their average value, the value of f₂ is set within 0.01 < f₂/f₀ < 0.9, and ΔU is selected from the condition where indices indicate preliminary estimation of maximum and minimum values of values U₃, U₁ and N₁.

EFFECT: technical result of the invention consists in reduction of time for reaching the working mode of the threshold signal detector with provision of maximum probability of signal detection.

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