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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/11110

Title: 適應陣列式水下聲傳數據機之研製---總計畫(II)
Development of Adaptive Array Based Underwater Acoustic Telemetry Modem (II)
Authors: 呂福生;曾敬翔;張順雄;洪賢昇
Contributors: NTOU:Department of Electrical Engineering
國立臺灣海洋大學:電機工程學系
Keywords: 水下聲學;數據通訊;數據機;可適性陣列;展頻
Underwater acoustics;Data communication;Modem;Adaptive array;Spread spectrum
Date: 2000-08
Issue Date: 2011-06-28T08:08:25Z
Publisher: 行政院國家科學委員會
Abstract: 本計畫是由四個子計畫組成,分別探討如何應用束波器、聲源方位估測器、等化/同步器、π/4DQPSK調變/解調器及展頻技術等,以改善水下聲傳數據機的性能。適應性束波器可隨傳輸環境調整束波器功能而消除干擾以提昇訊號強度,方位估測器可估測訊號源的方位以增加束波功能,等化器/同步器可消除符元干擾而增快傳輸速率,展頻技術可減小雜訊比需求以增加通訊距離並具保密性。
The research consists of following topics: adaptive beamforming, direction-of-arrival (DOA) estimation, equalization and synchronization, .pi.//4DQPSK modulation/demodulation techniques, and spread-spectrum system. DOA estimation and adaptive beamformer can depress interference and enhance the signal strength. The adaptive equalizer/synchronizer is necessary for avoidance of intersymbol interference. The spread-spectrum method is very preferable to long-distance data transmission with low signal power.
Relation: NSC89-2611-E019-049
URI: http://ntour.ntou.edu.tw/ir/handle/987654321/11110
Appears in Collections:[電機工程學系] 研究計畫

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