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Improvement of the scattering center extraction by using the modified approximate prolate series interpolants
Author(s) -
Bölükbas̨ Deniz,
Ergin A. Arif
Publication year - 2007
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.22509
Subject(s) - sinc function , inverse synthetic aperture radar , series (stratigraphy) , algorithm , scattering , function (biology) , synthetic aperture radar , basis function , convergence (economics) , truncation (statistics) , computer science , mathematics , physics , optics , mathematical analysis , radar imaging , artificial intelligence , radar , telecommunications , geology , paleontology , evolutionary biology , machine learning , economic growth , economics , biology
Abstract The three‐dimensional (3D) scattering center model of a complex target can be obtained from the 3D inverse synthetic aperture (ISAR) image by using the CLEAN algorithm. To form the ISAR image from the results of a shooting‐and‐bouncing‐ray (SBR) analysis, the image is updated on a ray‐by‐ray basis using a ray‐spread function, which turns out to be a “sinc” function. The “sinc” function does not decay rapidly, yielding a harsh trade‐off: in case the full “sinc” function is used, the algorithm becomes computationally intense. On the other hand, if it is truncated, convergence problems arise. To solve this trade‐off problem, the use of a band‐limited interpolant function, namely, modified approximate prolate series (MAPS) is proposed instead of the “sinc” function. The suggested MAPS can be shown to have better truncation error bounds than other ray spread functions. By using the suggested MAPS functions, the sidelobe artifacts are minimized and the computational complexity is decreased while extracting the scattering centers with correct positions, amplitudes, and better resolution. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 1623–1628, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22509