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

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（电波科学学报2016年第31卷第一期）

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4 X- t* n* l- f  Y2 O# W9 }0 W' F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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, u# V2 {" o; ~+ ]4 x关键词：电子侦察；相位编码；载频估计；低信噪比
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Abstract： Carrier frequency blind estimation of phase shift keying(PSK) signals in the electronic re-connaissance is discussed and a novel blind estimation method in iow signal to noise ratio(SNR) is pro-posed. The PSK signal is divided into some overlapping intervals of equal length. The spectral concentra-tion measures of the signal in every interval are calculated based on the Fast Fourier Transform. Then,the grid-density clustering algorithm is adopted to process the spectral concentration measures,and the cluste-ring result is regarded as the characteristic class. Finally,the spectrums of the characteristic class are ac-cumulated to estimate the carrier frequency of the PSK signal. Experimental results shows that the pro-posed method,which can effectively estimate the carrier frequency in iow SNR without any prior knowl-edge and is not sensitive to the coded type,is suitable for electronic reconnaissance occasions. Keywords electronic reconnaissance;phase shift keying;carrier frequency estimation;low SNR .


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