复数二维经验模态分解在SAR目标识别中的应用

Application of complex bidimensional empirical mode decomposition in SAR target recognition

  • 摘要: 提出基于复数二维经验模态分解(C-BEMD)的合成孔径雷达(SAR)图像目标识别。C-BEMD作为传统BEMD的复数域推广,能直接处理原始SAR图像(包含幅度和相位信息)。采用C-BEMD对原始SAR图像进行分解,获得多层次复数内蕴模函数(BIMF),反映目标时频二维特性。各层次BIMF既有独立描述能力,反映目标不同类型的特征;同时也具有内在关联性,即反映同一目标的固有属性。为此,分类算法基于联合稀疏表示设计,可利用内在关联性约束提高各层次BIMF的表征精度。利用MSTAR数据集中的多类目标SAR图像对方法进行测试验证,结果反映其在标准操作条件(SOC)和扩展操作条件(EOC)均可保持可靠的识别性能。

     

    Abstract: The complex bidimensional empirical mode decomposition (C-BEMD) was applied to target recognition of synthetic aperture radar (SAR) image. As an extension of traditional BEMD to complex domain, C-BEMD could directly process the complex SAR images (including the amplitude and phase information). C-BEMD was employed to decompose SAR images to obtain multi-layer bidimensional intrinsic mode functions (BIMF), which could reflect the time-frequency properties of images. These BIMFs had individual description capabilities, which reflected the target characteristics from different aspects. Also, they shared inner correlations, which were originated from the same target. The classification algorithm was developed based on the joint sparse representation, which used the inner correlations to improve the representation precision. The multi-class SAR images in the MSTAR dataset were used to test and validate the proposed method. The results confirm its reliable recognition performance under the standard operating condition (SOC) and extended operating conditions (EOC).

     

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