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时频域滤波沉底目标亮点特征提取方法研究

DOI: 10.3969/j.issn.1006-7043.201403052

Keywords: 沉底目标, 时频滤波, 脊波变换, Hough变换, 目标亮点

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Abstract:

主动声呐探测沉底目标时, 由于存在严重的海底混响干扰, 使得拷贝相关方法不能有效地提取目标回波亮点特征, 大大降低了主动声呐的目标识别性能。针对该问题, 研究了时频域滤波Hough变换的目标回波亮点特征提取方法。该方法采用互魏格纳变换将接收信号与拷贝的发射信号变换到时频域, 依据目标回波与混响及噪声能量的时频聚集特性不同, 采用时频域脊波变换滤波滤除混响及噪声, 最后利用Hough变换提取目标回波中各亮点峰, 并进行投影计算形成目标回波的亮点特征。同时研究了Hough变换域中的峰值位置与目标亮点对应的数学关系, 给出了基于时频滤波提取沉底目标亮点特征的算法步骤, 并采用支持向量机对比分析了该方法与拷贝相关方法提取亮点特征的识别效果。结果表明, 该方法能够在较低的信混比下有效抑制混响干扰提取亮点特征, 从而提高沉底目标的识别性能。

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