PROCESS MEASURING SIGNALS OF UNSPECIFIED FORM IN PRESENCE OF RANDOM NOISES Russian patent published in 1999 - IPC

FIELD: radio engineering. SUBSTANCE: in agreement with process signal with noise is subjected to discretization and coherent storage. Constant reference voltages U₁ and U₂ are formed, voltage U₂ is summed up with measured signal U_x with noise n(t) and additional noise N(t), multiplication with time shift is carried out, sequence of unipolar stepped pulses U_1Σstep(t) with length T_i1 is formed, periodic stepped pulses are transformed to harmonic ones by way of narrow-band filtration. Current magnitudes of phase of informative harmonic over period T₁ proportional to U_x(t) and recurring with frequency f₁ are converted to lengths of rectangular pulses τ_i1 with frequency f₁ and amplitude U₂₂. Sequence of unipolar rectangular pulses with length τ₁= T₁/2, amplitude U₁₂ and frequency f₁ time shifted through T₁/2 with regard to pulses having amplitude U₂₂ synchronized by signal frequency U_x(t) is formed. Sequences of pulses with frequency f₁ and amplitudes U₁₂ and U₂₂ are multiplied with sequences of rectangular pulses with frequency f₂. Sequence of stepped pulses U_2Σstep(t) recurring with frequency f₂ is formed. Unipolar stepped pulses are formed many times with reduction of pulse recurrence frequency till equality T_n= t_g= 1/2f_u.s is achieved where f_u.s is upper boundary frequency in spectrum of signal by Shannon theorem. Obtained magnitudes of phase of informative harmonic over period T_n proportional to current magnitude of measured signal U_x(t) are entered into storage. EFFECT: increased accuracy, speed of response, noise immunity and sensitivity, expanded dynamic range. 1 cl, 14 dwg