IPO結合FMM，RPFMM，F(xiàn)aFFA方法快速計算電大腔體的RCS
The Fast Calculation of RCS of Electrically Large Open-Ended Cavities Combine IPO, FMM, RPFMM, FaFFA
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摘要: 迭代物理光學法結合快速多極子(IPO+FMM)方法，可以快速計算電大腔體的電磁散射特性。傳統(tǒng)的快速多極子(FMM)方法需要計算兩組的轉移因子以及轉移過程的全部角譜分量，計算開銷是非常大的。隨著組間距離的增大，轉移過程可以用射線多極子(RPFMM)簡化計算，為了充分利用射線多極子方法中參與計算的有效角譜分量隨著組間距離增大而變少的特性，采用一種隨著組間距離增大自適應調(diào)整參與計算的角譜分量的錐形區(qū)域的射線多極子方法(RPFMM)，當兩組距離足夠大而位于遠場時，用遠場近似方法(FaFFA)進一步簡化計算。結果表明該方法能在保持計算精度的同時并能較IPO+FMM方法進一步減少計算資源占用、提高計算速度。Abstract: IPO+FMM method can rapidly solve the scattering of three-dimensional cavity. In the conventional Fast Multipole Method (FMM), at all directions of translation between two groups should be computed, it is expensive. The Ray-Propagation Fast Multipole Method (RPFMM) is applied to simplify the translation when two groups are well separated. In fact, the amount of translators to be calculated should be decrease with the increase of distance between two groups, to take full advantage of the characteristics; a self-adaptive ray-propagation fast multipole algorithm which can modulate the bound of cone zone of RPFMM is adopted. When the distance between two groups is enough large, Fast Far-Field Approximation (FaFFA) is used to further simplify the translation. The numerical results show this method is accurate enough and can improve efficient computing speed than IPO+FMM.
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