Features of the system of preliminary nonlinear probing in nonlinear radar

Abstract

The work is devoted to actual problem of estimation of the impact of density the obstructing nonlinear scatterers (NS) based on the structures "metaloxide-metal" in the nonlinear radar space on the efficiency of usage particular devise in nonlinear radar. The features of density estimation of the obstructing NS by specialized system of preliminary nonlinear probing (SPNP) are observed. The expediency of usage an additive mixture of the second component of phase-modulated (FM) signal and the "white" Gaussian noise as a probe signal for SPNP is shown. It is proved that the noise, which was re-emitted by obstructing NS, loses the characteristic of "white" noise, i.e. its spectrum becomes not uniform, but decreasing with frequency increasing. The "skirts" are appeared around the first, third and fifth harmonics of the re-emitted signal as a result of nonlinear interaction of initial components of signal and noise. If the component of the FM signal and the "white" Gaussian noise during the direct action on the obstructing NS are statistically independent, and therefore they are not correlated, then after re-emission by obstructing NS they becomes statistically dependent, and therefore they are mutually correlated, because the part of the energy of input signal transformed into a noise energy. It is also pointed out that the expression of these features of transforming the probing signal by obstructing NS SPNP allows to estimate the density of the obstructing nonlinear scatterers in the nonlinear radar space which is under study of nonlinear radars.