Study of Electromagnetic Scattering on the Problem of Low Frequency Crash on Random Rough Surfaces
Gao Zhengping;Guo Jingfeng;School of Microelectronics and Solid State Electronics,University of Electronic Science and Technology of China;
In this paper,a two-dimensional random rough surface is simulated by the linear filtering method,and a new augmented electric field integral equation(AEFIE) is introduced. A new type of integral equation is also used to solve the low-frequency collapse problem of RCS. When calculating the birefringence σ of a random rough surface by using the method of moment analysis(MOM) in the commercial FEKO software,the problem of low-frequency collapse arises because the sub-wavelength size is much smaller than the wavelength in the low frequency,resulting in lack of memory in the computer,calculation time is too long and the calculated scattering coefficient error is larger and so on. In this paper,the self-programming software AEFIE method and the multi-layer fast multipole algorithm(MLFMA) in the commercial FEKO software are used to calculate and compare the two-station scattering coefficient σ of the random rough surface. It not only shows that the AEFIE method can calculate the random rough surface scattering coefficient σ Accuracy,but also highlights the AEFIE method occupies less memory and more efficient features. At the same time,we also verify the influence of the root mean square height and the correlation length on the RCS,and finally conclude.
【CateGory Index】： TN011