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題名 | Analysis and Measurement of the Backscattering from a Helicopter Rotor=直升機旋翼之後向電磁散射 |
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作者 | 楊水源; 柏小松; 葉思明; | 書刊名 | 中正嶺學報 |
卷期 | 24:2 1996.01[民85.01] |
頁次 | 頁159-168 |
分類號 | 447.738 |
關鍵詞 | 物理光學; 物理繞射理論; 準靜態方法; Physical optics; Physical theory of diffraction; Quasi-stationary method; |
語文 | 英文(English) |
中文摘要 | 藉由準靜態方法,以物理光學及物理繞射理論之等效電流法,解析直升機旋翼之 電磁散射問題。在遠場時可獲得後向電磁散射之調變諧波譜,此頻譜特性類似某種純音調頻 特性,並以實驗驗證理論之正確性。 |
英文摘要 | The problem of electromagnetic scattering from a helicopter rotor is solved using the physical optics and physical theory of diffraction equivalent currents techniques with quasistationary method. It is shown that in the far zone the field can be taken to be harmonic, and the expressions for the spectral components of the field are obtained. The spectrum characteristics has a form similar to that associated with some kinds of frequency modulated tone modulation. The theoretical work is also confirmed by experiment. |
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