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| 題 名 | 四波道平面相位陣列幾何結構之研究=A Study on Geometric Structure of Four-Element Planar Phase Array |
|---|---|
| 作 者 | 洪惟堯; 瞿怡; | 書刊名 | 健行學報 |
| 卷 期 | 33:3 2013.07[民102.07] |
| 頁 次 | 頁17-36 |
| 分類號 | 448.5 |
| 關鍵詞 | 干涉儀; 平面相位陣列; 信號源指向; 混淆; 陣列幾何結構; Interferometer; Planar phase array; Dire ction of arrival; DOA; Ambiguity; Array geometric structure; |
| 語 文 | 中文(Chinese) |
| 中文摘要 | 利用干涉儀系統,可由天線陣列接收到的電磁波,處理信號之間的相位差, 準確並即時的估測信號源方向,由於它具有演算法相對簡單,以及通道數需求較 低的特點,目前仍然廣泛的使用於國防以及偵測系統。本論文先討論平面式陣列 構成干涉儀系統的最小通道數量,再討論四波道平面式陣列的結構,並推導平面 式陣列在任意幾何結構時的相位差關係;我們再研究三角形、矩形、圓形與四邊 形的結構,在天線間距大於半波長時的混淆(ambiguity)度。並以簡單的質數關係, 提出混淆度低的四邊形結構;再利用相位差關係,得到仰角與水平角的演算法。 我們利用電腦模擬實驗,比較我們提出的四邊形結構,與傳統的方法的估測精確 度及混淆度,並依據這些實驗的結果,討論新演算法可以工作的仰角範圍。 |
| 英文摘要 | In an interferometer system, the direction of arrival (DOA) of an incoming electromagnetic wave is estimated by processing the phase differences among signals received by an array of antennas in a real time manner. It is widely used in direction finding because its algorithm is relatively simple and the required number of channels is rather low. This work discusses first the lowest number of channels required and the relationship among the phase differences for a four-element planar array with arbitrary geometry. Secondly, the ambiguities for the following geometries are investigated: triangular, rectangle, circular and quadrilateral, as array spacing is larger than the half operating wavelength. Then an algorithm to estimate the azimuth and elevation angles is addressed for the quadrilateral geometry whose ambiguity is lower than the others. A simulation to compare the estimation accuracy and ambiguity between the quadrilateral array and the traditional array (with two perpendicular linear arrays) is provided. The range of elevation angle for which the new algorithm would work is also addressed according to the simulation results. |
本系統中英文摘要資訊取自各篇刊載內容。