Military Representative office of PLA in 786 Factory

Fengcheng, China

Military Representative office of PLA in 786 Factory

Fengcheng, China

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Li C.-Z.,PLA Air Force Aviation University | Tong C.-M.,PLA Air Force Aviation University | Qi L.-H.,Military Representative Office of PLA in 786 Factory | Wang T.,PLA Air Force Aviation University | Sui D.-X.,PLA Air Force Aviation University
Electromagnetics | Year: 2015

This article proposes to solve the extra-large-scale (e.g., larger than 1,000 square lambda) electric electromagnetic scattering problem on a wind-driven sea surface at a low grazing angle directed against a shore-based radar with an iterative physical optics model. In order to accelerate the convergence of the iterative physical optics model and improve its robustness, the forward-backward methodology and its modification with under-relaxation iteration are developed first to simulate the rough sea surface scattering. Meanwhile, according to the scattering characteristics of rough sea surface, the local iteration methodology and the fast far-field approximation in the matrix-vector product are proposed to reduce greatly the computational complexity. Through these techniques, this model can solve effectively the extra-large-scale electric scattering problem from the randomly rough sea surfaces. © Taylor & Francis Group, LLC.


Li C.-Z.,PLA Air Force Aviation University | Tong C.,PLA Air Force Aviation University | Qi L.,Military Representative Office of PLA in 786 Factory | Wang W.,PLA Air Force Aviation University | Wang A.,Electronic Systems Engineering Corporation of China
Frequenz | Year: 2016

An iterative physical optics (IPO) is proposed to solve the extra large scale (e.g. larger than one thousand square lambda) electromagnetic (EM) scattering from randomly rough surfaces in this paper. The forward-backward methodology and its modification with under-relaxation iteration improve convergence and stability of the IPO; the fast far-field approximation (FaFFA) in the matrix-vector product reduces the computational complexity based on the scattering characteristics of rough surface. Through these techniques, this model can solve effectively the extra large scale scattering problem from the randomly rough surfaces. © 2016 by De Gruyter 2016.


Li C.,PLA Air Force Aviation University | Tong C.,PLA Air Force Aviation University | Qi L.,Military Representative Office of PLA in 786 Factory | Wu G.,PLA Air Force Aviation University | Wang A.,Electronic Systems Engineering Corporation of China
Dianbo Kexue Xuebao/Chinese Journal of Radio Science | Year: 2015

Based on the effect of surface roughness on the electromagnetic scattering properties of the radar target, three kinds of novel sub-regionally composite randomly rough surface models with different surface roughnesses are presented to simulate the realistic environment. Instead of the traditional single spectral function model, the rough surface is modeled with different root mean square (RMS) heights and correlation lengths parameters. Finally, the sparse-matrix flat-surface iterative approach (SMFSIA) canonical grid (CAG) method is proposed to analyze the electromagnetic scattering characteristics of the three kinds of surface cases, especially for the influence of different surface roughnesses. Therefore, it provides a theoretical basis for the research, analyzes detection of terrain and landform accords with the actual natural environment. Copyright © 2015 by Editorial Department of Chinese Journal of Radio Science


Dongxin S.,PLA Air Force Aviation University | Chuangming T.,PLA Air Force Aviation University | Peng P.,PLA Air Force Aviation University | Lihui Q.,Military Representative office of PLA in 786 Factory
Asia-Pacific Microwave Conference Proceedings, APMC | Year: 2016

Brewster phenomenon is that the value of the specific angel of incidence for which the Fresnel reflection factor for TM light is null. It also affects the multipath effect of target on rough surface. The composite model of target on rough surface is built up, and PO-MEC is used to calculate the scattering field of the target, which is meshed. The multipath effect is studied on Four Path Model with the coefficient of rough surface. The G-Brewster is brought up on the basis. The condition of its existence is studied, and the elements of the composite model are taken in account. The characteristics of G-Brewster are shown up. The conclusion on G-Brewster is meaningful to overcome multipath interference. © IEEE.


Li C.,PLA Air Force Aviation University | Tong C.,PLA Air Force Aviation University | Bai Y.,PLA Air Force Aviation University | Qi L.,Military Representative Office of PLA in 786 Factory
Journal of Systems Engineering and Electronics | Year: 2016

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). © 2016 Beijing Institute of Aerospace Information.


Li C.-Z.,PLA Air Force Aviation University | Tong C.-M.,PLA Air Force Aviation University | Wang T.,PLA Air Force Aviation University | Wang W.-J.,PLA Air Force Aviation University | Qi L.-H.,Military Representative office of PLA in 786 Factory
Hongwai Yu Haomibo Xuebao/Journal of Infrared and Millimeter Waves | Year: 2016

The Electromagnetic (EM) scattering characteristics in terahertz (THz) band of non-uniform unstable electrical conducting target with different roughness surface is studied in this paper. The modeling concept of randomly rough surface is applied to model the target with non-uniform unstable roughness surface. Here, the root mean square (RMS) height and the correlation length of rough surface are applied to describe the roughness of different target surfaces. Firstly, the Gaussian surface is generated to model a non-uniform random unstable target, then a combined method of physic optics and equivalent current is employed to simulate the EM scattering in THz band. The scattering characteristics of the target with different roughness scales at different incident angles and radar frequencies are analyzed and discussed. Finally, the relevant conclusions are drawn. © 2016, Science Press. All right reserved.

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