主动时间反转技术是一种能够克服传输信道的多径效应，以达到目标回波的自适应聚焦新技术，在水声学、无线通信、材料学、医学治疗等领域得到广泛应用。本文提出一种改进的主动时间反转接收自聚焦方法，可以达到目标回波在接收处形成聚焦的效果，而不是在目标处形成聚焦。通过对单阵元和多阵元2种情况下主动时反的仿真研究对比，验证主动时间反转技术不仅能得到更高的增益提升，而且聚焦后回波信号具有波形结构简答的特点，对于信号处理也更加简单方便。此方法可以降低对主动时间反转技术的应用难度，对硬件的要求也更低。
As a new technology, which can overcome the multipath effect of the transmission channel, active time reversal(TR) technology has been widely used in underwater acoustics, wireless communication, materials science, medical treatment and etc. The focus technology based on time reversal detection proposed in this paper, which can achieve the effect of focusing the target echo at the receiving place, rather than at the target place.Through the simulation and research of active time reversal of single and multiple elements, we can not only get higher gain enhancement, simple waveform structure after focusing reduces the difficulty of subsequent signal processing;it’s helpful to reduce the difficulty of the application of active time reversal, it also further reduces hardware requirements.
2020,42(9): 135-139 收稿日期：2019-10-28
DOI：10.3404/j.issn.1672-7649.2020.09.026
分类号：TB556
作者简介：管日升(1976-),男,高级工程师,研究方向为水下小目标探测及水声信号处理等
参考文献：
[1] 刘小明. 扎实推进海洋强国建设[N]. 人民日报, 2013-08-07: 7.
[2] JACKSON D R, DOWLING D R. Phase conjugation in underwater aCOUS—tic[J]. J Acoust Soc Am, 1991, 89(3): 171–181
[3] KUPERMAN W A, HODGKISS W S, SONG H C, et a1. Phase co.jugation in the ocean:Experimental demonstration of an acoustic time-levemal mirror[J]. J Acoust Soc Am, 1998, 103(1): 25–40
[4] 阎丽明, 李建龙, 潘翔, 等. 时间反转处理用于掩埋目标探测[J]. 声学学报, 2008, 33(6): 542–547
[5] 孙琳, 李海森, 陈宝伟, 等. 时反法用于主动的研究与仿真[J]. 系统仿真学报, 2008, 20(1): 2529–2532
[6] 汪素萍, 宫先仪, 杜栓平. 主动时间反转聚焦技术[J]. 声学与电子工程, 2005, 79(3): 12–14
[7] 潘翔. 基于时问反转处理的水声信号增强研究[J]. 传感技术学报, 2006, 19(3): 848–850
