| 低信噪比下相位编码信号载频估计新方法 |
| |
| 引用本文： | 王晓峰,田润澜,张国毅. 低信噪比下相位编码信号载频估计新方法[J]. 电波科学学报, 2016, 31(1): 91-97. DOI: 10.13443/j.cjors.2015030101 |
| |
| 作者姓名： | 王晓峰 田润澜 张国毅 |
| |
| 作者单位： | 1.海军航空工程学院电子信息工程系, 烟台 264001 |
| |
| 基金项目： | 国家自然科学基金重点项目(61301237)，“十一五”总装备部武器装备预研项目(51309060308) |
| |
| 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估计新方法.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估计的特征类, 最后叠加特征类频谱并提取峰值得出信号载频估计值.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估计, 适合于电子侦察场合.
|
| 关 键 词： | 电子侦察 相位编码 载频估计 低信噪比 |
| 收稿时间： | 2015-03-01 |
A novel carrier frequency estimation method of phase shift keying signals in low SNR |
| |
| Affiliation: | 1.Department of Electronic Engineering, Naval Aeronautical and Astronautical University, Yantai 264001, China2.Department of Electronic Countermeasure, Aviation University of Air Force, Changchun 130022, China |
| |
| Abstract: | Carrier frequency blind estimation of phase shift keying(PSK) signals in the electronic reconnaissance is discussed and a novel blind estimation method in low signal to noise ratio (SNR) is proposed. The PSK signal is divided into some overlapping intervals of equal length. The spectral concentration 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 clustering result is regarded as the characteristic class. Finally, the spectrums of the characteristic class are accumulated to estimate the carrier frequency of the PSK signal. Experimental results shows that the proposed method, which can effectively estimate the carrier frequency in low SNR without any prior knowledge 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 |
| 本文献已被 万方数据 等数据库收录！ |
| 点击此处可从《电波科学学报》浏览原始摘要信息 |
|
点击此处可从《电波科学学报》下载免费的PDF全文 |
|
