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混响背景下水底目标回波盲分离

DOI: 10.3969/j.issn.1006-7043.201310034

Keywords: 水声探测, 掩埋目标, 混响, 信号混叠, 可分离性, 信号分离, 盲源分离

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Abstract:

针对水下掩埋目标探测中目标回波信混比较低的问题,提出将混响视为一类信源的与目标回波盲分离方法,研究了目标回波与混响在时域统计特性、时频域以及时域波形上的可分离性与分离原则问题,解决了传统时频方法不适用于当混响与目标回波在时频域内混叠时的抑制混响问题。海上掩埋目标探测实验数据处理结果表明,经过时域二阶统计盲分离与时频域盲分离处理后,目标回波的信混比提高了约5 dB,在时频分布上可以更清楚的观察到目标几何亮点,从而提高对目标回波识别的准确性。

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