RCS diagram records processing in Cheby¿shev space

In the case of optical approximation, when we process, in Cheby¿shev polynomial space, a record of diffracted power produced by a real structure formed by scatterers having isotropic RCS diagrams, in order to obtain its power spectrums, some new lines appear, which a previously proposed model (i.e. independent scatterers) ignored. In the letter we show that the principal explanation of the phenomena is the double reflection of an element of structure on another element.