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題 名 | 雷達回波訊號來向角之定位:K-Mean集群法和輪廓線法=Locating Approaches to Angles of Arrival of Radar Echoes: K-Mean Clustering and Contouring Methods |
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作 者 | 陳振雄; 謝政勳; | 書刊名 | 建國科大學報 |
卷 期 | 25:1 民94.10 |
頁 次 | 頁113-124 |
分類號 | 328.885 |
關鍵詞 | 陣列天線雷達; Capon法; 特高頻雷達; K-mean集群法; 輪廓線; Array-antenna radar; Capon method; VHF radar; K-mean clustering; Contour; |
語 文 | 中文(Chinese) |
中文摘要 | 針對特高頻陣列天線雷達多通道接收之大氣回波,本研究以Capon方法 解析雷達體積內之回波二維分佈,並發展K-mean集群法(clustering)和輪廓線(contour)定位程序來計算回波中心之來向角(angle of arrival)。結果顯示輪廓線定位法比較簡單、省時和精準,可以在短時間內處理大量資料,但是K-mean集群法仍不失為一可行方式。實際應用輪廓線法來分析德國OSWIN特高頻大氣雷達之中氣層測資料,發現常有多重回波中心,而且回波中心發生於特定區域,顯示在偵測區域內折射指數不規則體有特殊之結構。將來若能應用所發展之定位程序來分析大氣雷達之觀測資料,必能增進對大氣精細結構與特性之瞭解。 |
英文摘要 | Two-dimension distribution of the atmospheric echoes in the radar volume, observed with multiple-receiver VHF array-antenna radar, was resolved by using Capon’s method in this study. Two approaches were developed to locate the angles of arrival of echo centers, one is K-mean clustering and the other is contouring. The contour approach is demonstrated to be simpler, timesaving and more accurate at location so it can deal with a large number of data within short time. Nevertheless, the K-mean clustering is still an available method. Practical application of the contour approach to the mesosphere echoes, observed by German OSWIN VHF radar, has found multiple echo centers frequently. The multiple echo centers appeared in specific regions, indicating some kind of structure in the refractivity irregularities responsible for the echoes. In view of this, it may improve our understanding of the fine structures/characteristics of the atmosphere if the proposed locating approaches are applied to the atmospheric radar observations. |
本系統中英文摘要資訊取自各篇刊載內容。