Numerical methods for modeling of radar wideband signal scattering by aerial, ground and subsurface objects
In our review the developed electrodynamic numerical methods for modeling of scattering characteristics of complex-shaped electrically large and resonant radar objects are considered. Futures of mentioned numerical algorithms and their advantages in comparison with other well known techniques are discussed. Proposed algorithms allow obtaining frequency responses of air, ground, and subsurface radar objects for given sounding conditions. Particular qualities of object ultrawideband impulse response modeling are also briefly discussed. In conclusion we demonstrate some results of numerical modeling of ultrawideband impulse responses of different air, ground, and subsurface objects in VHF, UHF, and SHF bands. Such results have a wide field of application for solving applied problems at the stage of development of effective wideband radars of different types.
Method of radar detection and identification of metal and dielectric objects with resonant sizes located in dielectric medium
Mathematical model of a radar detection and identification system to be used for finding different objects buried in the ground or in other dielectric media is considered. In the suggested model scattering characteristics of 3D resonant objects are calculated by solving 2nd kind Fredholm integral equations for equivalent current densities on the object’s surface. Based on the obtained results we derive a method of detection and identification for specific types of objects which incorporates analysis of their natural resonant frequencies. Potentialities of the developed method for detection and identification of different types of mines are estimated.
PASSIVE AND LOW-ENERGY RESEARCH AND PRACTICES-DEHUMIDIFICATION
Methods of achieving acceptable indoor conditions in overheated, temperate, and underheated humid climates are discussed and compared. Desiccants and desiccant systems utilizing solid and liquid sorbents and various low-energy mechanical systems are described and evaluated.