Study On Wideband Polarization Information Processing

In this thesis, the theory and application techniques of wide-band radar polarization information processing are investigated deepgoingly and systematically against the background of wide-band polarimetric radar system.A completely new concept of instantaneous polarization (IP) is introduced in this thesis, which essentially break through the "harmonic" or "narrow-band" constant restrictions on classical polarization concept. With the concept of instantaneous polarization being the nucleus, a completely new framework of theory on electromagnetic (EM) polarization information processing is constructed. Not only does this theory covers the whole system of classical polarimetry, but also it provides powerful theoretic tools for the representation of inconstant EM waves' polarization and description of radar target' s wide-band polarization scattering characteristics. Using this theory system, some application subjects, such as EM signal filtering, radar target enhancement, radar signal and target detection, and radar target recognition, are investigated deepgoingly.The work of this thesis includes two levels:The first level is mainly concerned with the basic theory on EM polarization information processing. On the instantaneous polarization representation of EM waves, some basic concepts, such as EM wave's instantaneous polarization descriptor, instantaneous polarization time-frequency distribution, instantaneous polarization projection set, polarization cluster center, polarization divergence, polarization measure, instantaneous polarization state velocity, are introduced. With regard to the description of radar target' s polarization scattering characteristics in the sense of instantaneous polarization, target's instantaneous polarization scattering equation and instantaneous polarization scattering measurement equation are deduced. Via the concepts of. target instantaneous polarization scattering operator and instantaneous polarization measurement operator, target's polarization scattering characteristics are described. Furthermore, some characteristic parametric description methods, which are based on the concepts of target scattered wave' s polarization...