Estimating a spectral correlation function and its errors owing to inexact frequencies

This paper is devoted to estimating a spectral correlation function using DFT. The examined signal is a simple DSB-SC signal. The aim of the paper is to analytically describe events connected with nonstandard relations between signal frequency parameters and sampling frequency. They manifest by descending the spectral correlation function modulus. Validity of the analytical description was verified using computer simulations for deviations of carrier frequency, cyclic frequency and both frequencies and variable number of the sliding DFT windows. Analysis of the errors is presented. An imperfection of the analytical relations is mostly insignificant. Founded equations are simple and allow judge consequences of the frequency faultiness without simulations.