Radar Cross Section Prediction for Coated Perfect Conductors with Arbitrary Geometries.
AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH
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Radar cross section prediction for coated objects is an important problem with many practical applications. The method of moments is applied to solve the elctro-magnetic scattering from dielectricmagnetic coated perfect conductors with arbitrary geometries. The governing equations are derived by making use of the equivalence principle and the dyadic formulation of Huygens principle. Matching boundary conditions then generates a set of integro-differential equations with the equivalent electric and magnetic surface currents as the desired unknowns. Triangular patch modelling is applied to the boundary surfaces. The method of moments with a bi-triangular subdomain basis is used to convert the set of integro-differential equations into a matrix equation which can be solved by matrix inversion for the unknown surface current coefficients. Huygens principle is again applied to calculate the scattered electric field produced by the equivalent surface currents. Finally, the far-field monostatic radar cross section is calculated from the scattered electric field to perform the radar cross prediction for coated perfect conductors with arbitrary geometries. The governing equations for both completely coated and partially coated perfect conductors are derived. The coatings may have any arbitrary complex permittivity andor permeability. Radar cross section measurements of various coated and uncoated square aluminum plates also have been made to validate the theoretical predictions. Comparisons between the predicted and measured data are made. The concepts for the generalization to multi-layered coatings also are discussed. Author
- Active and Passive Radar Detection and Equipment
- Radiofrequency Wave Propagation