Systems Engineering and Electronics

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Iterative physical optics model for electromagnetic scattering and Doppler analysis

Changze Li1,*, Chuangming Tong1 , Yan Bai1 , and Lihui Qi2   

  1. 1. Air and Missile Defense College, Air Force Engineering University, Xi’an 710051, China;
    2. Military Representative Office of PLA in 786 Factory, Xi’an 710051, China
  • Online:2016-06-25 Published:2010-01-03

Abstract:

An iterative physical optics (IPO) model is proposed to solve extra large scale electric electromagnetic (EM) scattering from randomly rough surfaces. In order to accelerate the convergence of the IPO model, the forward-backward methodology and its modification with underrelaxation iteration are developed to simulate the rough surface scattering; the local iteration methodology and the fast far field approximation (FaFFA) in the matrix-vector product are proposed to reduce greatly the computational complexity. These techniques make Monte Carlo simulations possible. Thus, the average Doppler spectra of backscattered signals obtained from the simulations are compared for different incident angles and sea states. In particular, the simulations show a broadening of the Doppler spectra for a more complicated sea state at a low grazing angle (LGA).