低信噪比下相位编码信号载频估计新方法

Colbie

低信噪比下相位编码信号载频估计新方法

（电波科学学报2016年第31卷第一期）

摘要：研究了电子侦察中相位编码信号的载频估计问题，提出一种低信噪比下载频佑计新方法．该 方法首先将相位编码信号划分为等长度的交叠区间，并计算各个区间内信号频谱的聚集性测度，然后采用网 格密度聚类算法对聚集性测度进行分类，以聚类结果作为载频佑计的特征类，最后叠加特征类频谱并提取峰 值得出信号载频佑计值，实验结果表明，该方法无需先验知识，对编码形式不敏感，且能够在较低信噪比下完 成相位编码信号的载频佑计，适合于电子侦察场合。
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关键词：电子侦察；相位编码；载频估计；低信噪比
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