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PIER PIER B PIER C PIER M PIER Letters
2012-02-08
Improvement of Iterative Physical Optics Using Previous Information to Guide Initial Guess
By
Huicheol Chin,

    Dr. Huicheol Chin

    Department of Electrical Engineering

    Pohang University of Science and Technology (POSTECH)

    Korea

    Homepage

Jae-Hyun Yeom,

    Dr. Jae-Hyun Yeom

    Department of Electrical Engineering

    Pohang University of Science and Technology (POSTECH)

    Korea

    Homepage

Hyo-Tae Kim,

    Dr. Hyo-Tae Kim

    Electrical and Computer Engineering Division

    Pohang University of Science and Technology

    Korea

    Homepage

Kyung-Tae Kim

    Prof. Kyung-Tae Kim

    Department of Electrical Engineering

    Pohang University of Science and Technology

    Korea

    Homepage

Progress In Electromagnetics Research, Vol. 124, 473-486, 2012
doi:10.2528/PIER12011103
Abstract
We propose an improved method of iterative physical optics (IPO) to analyze electromagnetic scattering by open-ended cavities. The traditional IPO method uses a fixed number of iterations; if this number is too small, the accuracy of the estimated monostatic radar cross section (RCS) of open-ended cavities degrades as the incident angle of the incident field increases. The recently-introduced adaptive iterative physical optics-change rate (AIPO-CR) method uses a variable number of iterations; compared to the IPO method, it predicts monostatic RCS more accurately, but requires more computation time. In this paper, a new algorithm is devised to improve both the monostatic RCS prediction accuracy of the IPO method, and the computational efficiency of the AIPO-CR method. The proposed method, iterative physical optics-retained previous solution (IPO-RPS), calculates the currents at one incident angle, then reuses them as the initial currents of iterations for the next incident angle. In simulations of the monostatic RCS for various open-ended cavities, the IPO-RPS method was more accurate than the traditional IPO method, and computationally more efficient than both the IPO and AIPO-CR methods.
Citation
Huicheol Chin, Jae-Hyun Yeom, Hyo-Tae Kim, and Kyung-Tae Kim, "Improvement of Iterative Physical Optics Using Previous Information to Guide Initial Guess," Progress In Electromagnetics Research, Vol. 124, 473-486, 2012.
doi:10.2528/PIER12011103
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