Improvement of Iterative Physical Optics using Previous Information to Guide Initial Guess
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SCOPUS
- Title
- Improvement of Iterative Physical Optics using Previous Information to Guide Initial Guess
- Authors
- Chin, H; Yeom, JH; Kim, HT; Kim, KT
- Date Issued
- 2012-01
- Publisher
- Progress In Electromagnetics Research
- 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.
- Keywords
- OPEN-ENDED CAVITY; ELECTROMAGNETIC SCATTERING; ANTENNA; ARRAY; RCS
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/15807
- DOI
- 10.2528/PIER12011103
- ISSN
- 1559-8985
- Article Type
- Article
- Citation
- Progress In Electromagnetics Research, vol. 124, page. 473 - 486, 2012-01
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