矢量反转镜时空滤波技术研究

Study on space-time filtering technology based on an acoustic vector time-reversal mirror

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。

The time-reversal mirror's refocus effects are studied based on the point of view of the channel theory, particularly, Vector Time-reversal Mirror (VTRM) space-time filtering technology is introduced in this paper. The results of VTRM's spatial match characteristic, processing gain, detecting ability and robust behavior show that VTRM produces focusing in time as well as in space. Focusing in space occurs because the coherence of multipath channel is applied and focusing in time occurs because the difference of the correlation of acoustic pressure and particle velocity is applied. This kind of VTRM technology not only has higher performance and precision, but also is more robust and stable than conventional time-reversal technology.