非平稳海杂波背景下子带开关相干检测器

发布时间：2018-03-17 05:09

本文选题：雷达目标检测　切入点：非平稳海杂波　出处：《电子学报》2014年10期 　论文类型：期刊论文

【摘要】：海杂波由纹理分量调制散斑分量构成,本文着重研究纹理分量和散斑分量的平稳特性.首先,通过DFT调制滤波器组将海杂波分解到各个子带,提出两种一致性因子分别衡量各个子带海杂波的纹理分量和散斑分量的平稳性,实验结果表明海杂波的非平稳特性主要体现在纹理分量上,强杂波区的纹理分量体现出显著的非平稳性,弱杂波区的纹理分量具有平稳特性.进一步针对海杂波在不同多普勒频率分量上具有不同的平稳特性,将纹理分量的一致性因子作为判断函数,分别使用样本协方差矩阵和归一化样本协方差矩阵估计算法,提出了子带开关自适应归一化匹配滤波(Adaptive Normalized Matched Filter,ANMF)检测器.实测的海杂波数据实验结果表明,子带开关ANMF检测器的性能优于对比算法.
[Abstract]:Sea clutter is composed of texture component modulation speckle component. In this paper, the stationary properties of texture component and speckle component are studied. Firstly, sea clutter is decomposed into each sub-band by DFT modulation filter bank. Two kinds of consistency factors are proposed to measure the smoothness of texture and speckle components of each sub-band sea clutter respectively. The experimental results show that the non-stationary characteristics of sea clutter are mainly reflected in texture components. The texture component of the strong clutter region shows significant non-stationarity, and the texture component of the weak clutter region has the stationary property. Furthermore, the sea clutter has different stationary characteristics on different Doppler frequency components. The consistency factor of texture component is taken as the judgment function, and the estimation algorithms of sample covariance matrix and normalized sample covariance matrix are used, respectively. A subband switch adaptive Normalized Matched filter ANMF detector is proposed. The experimental results of sea clutter data show that the performance of the subband switch ANMF detector is better than that of the contrast algorithm.
【作者单位】：南京邮电大学通信与信息工程学院;
【基金】：国家自然科学基金(No.61201325) 南京邮电大学引进人才基金(No.NY212018)
【分类号】：TN957.52

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