Forward-backward iterative physical optics algorithm for computing the RCS of open-ended cavities

Autor:	Robert J. Burkholder, T. Lundin
Rok vydání:	2005
Předmět:	Physics Radar cross-section Wave propagation Iterative method Convergence (routing) Waveguide (acoustics) Relaxation (iterative method) Electrical and Electronic Engineering Physical optics Algorithm Cavity wall
Zdroj:	IEEE Transactions on Antennas and Propagation. 53:793-799
ISSN:	1558-2221 0018-926X
Popis:	The forward-backward methodology is combined with the iterative physical optics (IPO) algorithm to improve convergence for cavity scattering problems. Wave propagation inside elongated cavities, such as jet engine inlet ducts, follows a predominant down-and-back path. The forward-backward method allows the IPO currents on the cavity walls to be updated sequentially (forward) and reverse-sequentially (backward) along the waveguide axis. A relaxation parameter is introduced to help control the convergence characteristics, making the new algorithm mathematically equivalent to the classical iterative method of symmetric successive over-relaxation. The fast far-field approximation (FaFFA) accelerates the matrix-vector products in the IPO formulation, and an equivalent surface impedance is used to characterize thin material linings in the cavity.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::166de00654a5a378b1aa0a8b4b153afb https://doi.org/10.1109/tap.2004.841317 Zobrazit plný text záznamu