頁籤選單縮合
題 名 | 利用週期平穩信號作快速方向偵測=Fast Estimating Direction of Arrival Using Cyclostationary Signals |
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作 者 | 張豫虎; 周子堯; | 書刊名 | 中原學報 |
卷 期 | 27:1 1999.03[民88.03] |
頁 次 | 頁69-76 |
分類號 | 448.5 |
關鍵詞 | 週期平穩信號; Cyclic-MUSIC; Spatial smoothing; Cyclostationary; |
語 文 | 中文(Chinese) |
中文摘要 | 由於絕大多數的人工訊號都具有週期平穩信號的特性,是以我們可利用頻譜相關 的特性來對信號作萃取, Cyclic-MUSIC 演算法即是一種作信號選擇性的方向估測演算法。 但仍和大多數高解析特徵性質結構技術一樣,對於完全相關訊號或是信號同調沒有辦法作有 效的處理。雖然由 Shan 和 Kailath 提出的空間平滑 (Spatial Smoothing) 法可以解決這 問題,但仍有缺點,例如,會減少陣列的感應信數目、計算量龐大耗時。在這裡,我們提出 一改良架構,兼具信號選擇性及偵測完全相關信號的特性。讓複雜的信號型式經簡化,變成 只和入射方位有關的簡單信號。 再經一類似空間平滑法求出入射方向, 大大縮小協方差 (covariance) 矩陣的大小,增加整體架構運算的速度。 最後由模擬結果可看出我們提出的 改良架構確是優於傳統的空間平滑法。 |
英文摘要 | The problem of exploiting cyclostationary statistical information for the purpose of array processing is addressed. The cyclic-MUSIC algorithm exploits the cyclostationarity of the signals to estimate the direction of arrival at an array process. Although the algorithm can extract the signals of interest, it does not operate properly in the presence of fully correlated or multipath. A well-known method, Spatial Smoothing technique, has been proved to be effective in coherent signals, however; such scheme has drawback of calculation complexity. An improved structure that can reduce the amount of calculating is proposed. The structure amount of calculating is proposed. The structure presented here combines the signal-selective cyclic-MUSIC with the Spatial Smoothing technique to improve the arrived angle estimation of the fully correlated signals. Simulation results that illustrate the performance of the improved structure are presented. |
本系統中英文摘要資訊取自各篇刊載內容。