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从信道理论出发研究了时间反转镜的聚焦效应,提出矢量反转镜时空滤波技术,对其空间匹配特性、处理增益、检测能力、稳健性作了研究。结果表明:利用海洋信道的相干多途特性,矢量反转镜可实现信号的空间匹配滤波;利用了相干源信号声压、振速相关性与各向同性干扰声压、振速相关性的差异,矢量反转镜可完成信号的时间匹配滤波。因而较传统的反转镜技术,利用矢量反转镜时空滤波技术进行目标无源检测可获得更好的检测性能、更低的检测阈及更强的稳健性。
From the channel theory, the focusing effect of the time-reversing mirror is studied. The space-time filtering technology of the vector reversing mirror is proposed, and its space matching characteristics, processing gain, detection capability and robustness are studied. The results show that the signal is spatially matched and filtered by the vector inverted mirror. The correlation between the sound pressure and the velocity of the coherent signal and the sound pressure and the velocity of the isotropic disturbance is utilized , Vector reversal mirror to complete the time signal matching filter. Therefore, compared with the traditional reverse mirror technology, the vector passive mirror spatio-temporal filtering technique can achieve better detection performance, lower detection threshold and stronger robustness.