Complex Radar Cross Section Of The Analytical Method

With the development of computational electromagnetics, electromagnetic scattering of electrical large target attracts more and more attention. Rapidly analyzing the RCS of electrical large target has an important significance on the stealth technology and anti-stealth technology. In order to effectively calculate the RCS of the target, this thesis mainly concentrates on the following researches: the PO method and the equivalent edge currents method which is used to amend the PO method; the method of SBR which is based on the ray density normalization (RDN); the application of PO method in calculating the scattering characteristic of plasma-coated target and the hybrid method of PO and MoM.Firstly, the PO method in high-frequency methods is introduced in detail in this thesis, and it is amended by the method of the equivalent edge currents. Secondly, the method of RDN-SBR is formed introducing RDN based on the SBR. It is a current approximation aroused by multi-reflection of electromagnetic wave, because of this approximation the field and current on patches can be applied directly by the hybrid method. Thirdly, due to the unique stealth performance of plasma and its application in the stealth technology of Military targets, the reflection coefficients which are determined by the plasma parameters are investigated by dividing the non-uniform plasma into a series of isotropy media layers. Then the RCS of the plasma-coated of the conductor target is calculated based on the method of PO. Fourthly, the MoM represents a suitable procedure for dealing with electromagnetic scattering problems of arbitrary geometrical shape in the lower frequency range. However, with increasing frequency both computation time and memory requirement often exceed available computer capacities. Therefore a current based hybrid method combining the MoM with the PO approximation suitable for three-dimensional perfectly conducting bodies is proposed in this thesis. The hybrid formulation allows a substantial reduction of computation time and memory requirement, while the results are in reasonable agreement with those based on an application of the MoM alone. For the iterative problem during solving the problems by MoM, in this thesis the multi-resolution pre-processing technology is introduced, which improves the calculation efficiency in the same accuracy.