volume | PIER Journals

2017-02-02

Real-Coefficient FGG-FG-FFT for the Combined Field Integral Equation

Hua-Long Sun,

Dr. Hua-Long Sun

Air Force Engineering University

China

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Chuang Ming Tong,

Dr. Chuang Ming Tong

Air and Missile Defense College

Air Force Engineering University

China

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Peng Peng,

Dr. Peng Peng

Air and Missile Defense College

Air Force Engineering University

China

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Gao Xiang Zou,

Dr. Gao Xiang Zou

Air and Missile Defense College

Air Force Engineering University

China

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Gui Long Tian

Dr. Gui Long Tian

Air and Missile Defense College

Air Force Engineering University

China

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Progress In Electromagnetics Research M, Vol. 54, 19-27, 2017

doi:10.2528/PIERM16112202

Abstract

This article proposes a new scheme of real-coefficient fitting both Green's function and its gradient with Fast Fourier Transform (RFGG-FG-FFT) for combined field integral equation (CFIE) to compute the conducting object's electromagnetic scattering, which improves original fitting both Green's function and its gradient with Fast Fourier Transform (FGG-FG-FFT) on efficiency. Firstly, based on Moore-Penrose generalized inverse, an equivalent form of fitting matrix equation is obtained containing the property of Green's function's integral proved by addition theorem. Based on this property, with truncated Green's function new fitting technique is presented for computing fitting coefficients with real value expression, which is different from complex value expression by the original fitting technique in FGG-FG-FFT. Numerical analysis of error shows that new fitting technique has the same accuracy, but only one half of sparse matrices' storage compared to the original fitting technique in FGG-FG-FFT. Finally, the new scheme combining FGG-FG-FFT and new fitting technique is constructed. Some examples show that the new scheme is accurate and effective compared to FGG-FG-FFT and p-FFT.

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Hua-Long Sun, Chuang Ming Tong, Peng Peng, Gao Xiang Zou, and Gui Long Tian, "Real-Coefficient FGG-FG-FFT for the Combined Field Integral Equation," Progress In Electromagnetics Research M, Vol. 54, 19-27, 2017.
doi:10.2528/PIERM16112202

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