臺灣博碩士論文加值系統

方位估測一直是天線陣列訊號處理中重要的一環。所謂方位估測, 即是在找尋訊號源的角度。在方位估測的領域中, 已經發展出許多技術, 例如著名的MUSIC演算法。 關於訊號源在近場的情況, 一般都是討論不同調的問題, 甚少涉及到部分相關及同調的問題。在本論文中, 首先我們討論在一維及二維天線陣列近場同調訊號源的方位估測問題, 使用重建矩陣特性的方式, 來解決方位估測問題。此外, 我們也提出了利用2-D MUSIC頻譜來估測方位及源距的有效率方法, 而這樣的方式並不是藉由作圖來估測部分相關訊號源的方位及源距。另外, 在有效率方法中, 加入一種停止準則, 發現會使運算時間更快且效果更好。接著針對在Fresnel approximation區域上, 利用求根值的方法來找出部分相關訊號源之方位及源距。發現其效果很好, 但是求根值的運算時間太長是其唯一的缺點。最後利用訊號的週期穩態特性, 使用一些重建矩陣特性的方式, 來解決部分相關訊號源的方位估測問題。

Bearing estimation has been for a long term an important segment of antenna array signal processing. To find out the angle of the source is so-called bearing estimation.
Many techniques have been developed in the field of bearing estimation, the famous MUSIC algorithm, for example.
As to the situation of source in the field, generally incoherent issues only few related to partially correlated and coherent ones, are discussed. At first, bearing estimation issues of 1-D and 2-D antenna array near field and coherent sources are down for discussion in this thesis. The method of reconstruct matrix speciality is used to bring a matter to a bearing estimation issues. In addition, an efficient method to estimate bearings and ranges by utilizing 2-D MUSIC spectrum is as well proposed, yet this method is not estimating partially correlated sources bearings and ranges by plotting. Besides, when stop criterion is added in the efficient method, operation time is discovered shorter and more effictive. It is continued to utilize the method of finding roots directed to discover partially correlated sources bearings and ranges in Fresnel approximation area, and its efficiency is well appreciated, however, the only defect is operation time of finding roots takes too long. Finally signal cyclostationarity plus the method of reconstruct matrix speciality are utilized to
solve the bearing estimation issues of partially correlated sources.

第1章 緒論
第2章 陣列訊號處理之理論基礎與估測法
2.1節 訊號模型與理論基礎
2.1.1節 一維可適性天線陣列訊號模型
2.1.2節 二維可適性天線陣列訊號模型
2.2節 近場源方位與源距之估測法
第3章 近場源之方位估測技術
3.1節 簡介
3.2節 部分相關源及同調源問題
3.3節 一維近場源方位估測
3.3.1節 一維FFA演算法
3.3.2節 一維空間平均法
3.3.3節 2-D MUSIC估測器之估測方位及源距
3.4節 二維可適性天線陣列及架構
3.5節 二維近場源方位估測
3.5.1節 二維FFA演算法
3.5.2節 二維空間平均法
3.6節 模擬結果與討論
附 錄 3.A
附 錄 3.B
第4章 基於路徑跟隨法之估測近場源方位與源距法
4.1節 簡介
4.2節 方位與源距之估測法
4.2.1節 方位與源距之初始值設定
4.2.2節 路徑跟隨法
4.3節 模擬結果與討論
第5章 存在週期穩態特性訊號的方位估測技術
5.1節 簡介
5.2節 利用週期穩態特性之方位估測法
5.3節 HAM演算法改良式FFA演算法
5.4節 模擬結果與討論
第6章 結論及未來研究方向

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