EFFECT OF MULTIPLICATIVE NOISE ON THE COHERENT SIGNAL FREQUENCY MEASUREMENT AGAINST THE BACKGROUND OF WHITE NOISE
V. M. Artyushenko1, V. I. Volovach2,3
1Technological University named after twice Hero of the Soviet Union, pilot-cosmonaut A. A. Leonov, Korolev, Russia
2Volga Region State University of Service, Togliatty, Russia
3Voronezh State University, Voronezh, Russia
Keywords: tracking meter, multiplicative noise, white noise, frequency measurement accuracy, coherent input signal, discriminator output signal, steepness of the discrimination characteristic, spectral density of fluctuations
Abstract
The effect of multiplicative noise acting simultaneously with white noise on the accuracy of measuring the frequency of a coherent signal given as a sequence of coherent pulses is considered and analyzed. The condition for the absence of systematic errors at the output of the tracking meter is determined. The steepness of its discrimination characteristic, the spectral density of fluctuations at the discriminator output, and the coefficients that determine the normalizing action of automatic gain control are found. These values determine the amount of deterioration in the accuracy characteristics of the meter under the influence of multiplicative noise. It is shown that the influence of multiplicative noise increases with a decrease in the level of the undistorted part of the signal and with an increase in the ratio of the signal energy coherently accumulated in the linear circuits of the discriminator to the power spectral density of additive noise. It is shown that the effect of multiplicative noise is most pronounced in those cases where the width of the spectrum of the noise modulation function is commensurate with the bandwidth of the linear circuits of the discriminator.
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