Determination of the Spectral Density of the Output Signal of the non-Energy Signal Parameter Meter

We analyzed the effect of multiplicative noise affecting the useful signal simultaneously with additive noise on the spectral density of the output signal of a two-channel discriminator. The analysis was performed for the input coherent signal and for the input signal in the form of a sequence of incoherent pulses. It is initially assumed, that power spectral density of output signal is constant in the bandwidth of the system. It is also assumed that the tracking meter is considered as a linear system. In this paper, an analysis is performed for two different cases of change in the noise modulation function. It is shown that the effect of multiplicative noise on the spectral density of the output signal, as well as the measurement error variance, increases with decreasing levels of additive noise. It is also shown that at a low level of additive noise and at the continuing action of multiplicative noise, the increase in the spectral density of the output signal will affect the measurement errors to a greater extent than the decrease in the steepness of the discriminatory characteristic of the measuring device of the useful signal parameters.