High-order parabolic equation method for electromagnetic computation

A high-order PE method has been derived and analyzed for solving multi-object RCS for the first time. Compared with the existing method SPE, the present method has following features: Firstly, boundary conditions including PML and scatterers boundary conditions can be handled as easy as SPE method. Secondly, to obtain the full bistatic RCS, we need only two rotated PE runs for high-order PE while in SPE method the number is twelve. Last but most important of all is that due to the narrow-angle approximation, the SPE cannot handle multi-object scattering problems exactly while the high-order PE method can compute multi-object RCS efficiently. The method is very powerful in deal with objects quite large compared to the wavelength.