水聽器陣列訊號偵測之實驗研究

Abstract

本論文首先簡介此實驗系統的硬體架構與取樣資料之軟體特性，並探討在 一個水槽實驗系統中用各種方向估計方法偵測在淺水環境的聲源方向和討 論環境因素所造成的影響。吾人利用包括富氏、MVDR、 MUSIC、ESPRIR、 單脈波和三波束等定向法，來處理五個水聽器所構成之線型陣列所接收的 資料。實驗結果顯示，此六種方法所估計的結果與理論值比較各有不同程 度的誤差，但都非常小且皆在可接受的範圍內。因此，這六種定向法不僅 提供模擬方面作方向估計時的準確性，更對實作方面提供了正確、快速的 目標物定向。 In this thesis, we conduct the experimental study on a linear hydrophone array system operating in a shallow water envirmnment simulated by a water tank. The structure of the system and the experimental set-up are first described. Experiments are then performed to evaluate the effectiveness of some direction-of-arrival (DOA) estimators in detecting acoustic sources, and identify the influence of environmental factors. These include Fourier, MVDR, MUSIC, ESPRIT, monopulse and 3-beam estimators. Experimental results show that these methods yield satisfactory estimates, though some errors are observed. The results demonstrate the efficacy of these DOA estimators and their feasibility in practice.