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中文摘要：
本文针对水声信道的特点，提出了一种适于水下传感器网络突发通信分组前导码检测的自适应阈值算法。该算法根据估计的信号瞬时功率自适应地调整阈值，以取代固定阈值算法中的预设常数阈值。进行了理论分析和仿真，证明该算法具有恒虚警的特点，检测概率比固定闽值算法有明显的提高。针对检测到相关函数旁瓣的情况，加入了滑动窗口。该算法经过了湖试验证，性能良好，具有实用价值。
英文摘要：
In consideration of the underwater acoustic fading channel, an adaptive threshold algorithm is proposed for preamble detection of burst communication packet in underwater sensor networks. Instead of taking a predetermined constant as in a constant threshold algorithm, the threshold is adjusted according to the instantaneous signal power estimation. Theoretical analysis and computer simulation are performed which show that the algorithm has the characteristics of the constant false-alarm detection, and that the detection probability is clearly improved, compared to that of the constant threshold detection. In order to solve the problem that side lobe appears, a sliding window is introduced. With lake experiment, this algorithm is proved to achieve good performance and be proper for practical application.
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