N.Yu. Babanov, S.V. Lartsov

Non-linear scatterer (NLS) ? markers are characterized by being used as informational-diffused signal (DS) at the frequency of the harmony of probing signal (PS). Their usage is appropriate if there are lots of linear reflectors that do not diffuse signals at the frequency of the harmony. Except for the information about amplitude (power) properties of NLS markers, it is necessary to take into account their spatial properties and in case of synthesis to be able to form these properties. Usually, by analogy with the linear radiolocation, such special properties are characterized by a diagram of the inverse non-linear diffusion, which does not allow estimating the reaction of NLS-markers on probing signal when changing special parameters of non-linear probing. Analysis of the phenomenological model of a NLS-marker, which consists of consequently connected with tracts of the receiving antennas components - non-linear element and radiant antenna, showed that it is necessary to define three dependencies in order to describe its spatial properties: amplitude characteristics ПDS = F(ПPS), normalized directional diagram of receiving and radiant antennas of the NLD-marker DS(DS,DS,DS) and PS(PS,PS,PS), where ПPS and ПDS are strength of PS wave that falls on the NLD and DS wave at 1 meter distance from NLS, PS, DS are azimuths, PS, DS are tilt angles, PS,DS are inclinations of polarization plane of the receiving and radiant antennas of the NLS-marker model. All the three characteristics can be defined experimentally or theoretically, together they characterize spatial-amplitude properties of the NLS-marker. Based on them, a diagram of the inverse non-linear diffusion should be written as follows: ПDS(ПPS,PS,PS,PS,DS,DS,DS)=DS(DS,DS,DS) F (ПPSPS(PS,PS,PS)). This ratio is easy to reorganize into the main equation of non-linear diffusion for the NLS-marker if one solves a typical problem of sweeping and finds connection between power outputs in a deep non-linear probe with ПЗС and received power with ПРС. Analysis of the phenomenological model of a NLS-marker allows characterizing its polarization properties. At the same time there are significant effects connected with inertance of non-linear transform and delay in the diffusion in tracts and with polarity of engaging a non-linear element and antennas