Modeling Theory And Simulation Of High Frequency Radar Scattering Properties Of Coated Craft Target

the properties of a target’s electromagnetic scattering, as a basic area, are significant on the research of radar target. Stealth and camouflage can be achieved by controlling the properties of a target’s electromagnetic scattering properly. And in the stealth technology, simulation, which can reduce the workload, time and cost, has got a very important position. Therefore the study on new method of modeling and simulation is significant and applied. This paper, using craft target as carrier, have studied the creation of3-dimensional geometric entity and simulation model of perfect conductor and coating object. Firstly the3-dimensional geometric entity had been built by using a parameterized geometric modeling method. With the consideration of actual scattering situation, details that contributed little to total scattering were ignored, and others in components which contributed strong scattering were constructed in details. After that a suitable entity for scattering analysis had been built. Then the surface was meshed by triangular units. Scattering problem was analyzed by Method of Moments, in which Multilevel Fast Multipole Algorithm has been used to turn the integral equation matrix into a sparse matrix, which improved the efficiency while accuracy was guaranteed. Through the simulation of a case, scattering data of a perfect conductor craft had been got. Analysis showed that the wing-body junction, intake and tail fin had strong scattering. In analysis of coated objects, FEM and Floquet were combined to obtain the S-parameters of open boundary problem. And the model has a high accuracy. Consider the properties of absorbing material, the electromagnetic parameters were fitted to function. And the result was close to the original curve so that the simulation accuracy was guaranteed. At last the coated craft was analyzed using PO. Its monostatic and bistatic RCS had been obtained and analyzed. The inverse problem of electromagnetic was introduced. And scattering results were optimized in Genetic Algorithm. Example shows that optimization can meet the design specifications.