Conditions to the radar vector signal providing simultaneous measurements of all back-scattering matrix elements

The properties of the illuminating waveforms and conditions of the signals, forming orthogonal (by polarization) vector sounding signals are discussed. These signals are needed in order to estimate the back-scattering matrix (BSM) of real media and objects. It is shown that the correct BSM estimation of fluctuating objects, having a-priori unknown ranges and radial velocities, is possible only when complicated orthogonal signals are being used. The principles of forming the needed radar waveforms as well as principles of backscattered vector signal processing, assuming Gaussian noise at the receiver is formulated.