时间反转处理用于目标探测研究

为提高工作在浅海的声纳性能，提出了基于时间反转处理的微弱目标信号探测的新方法.利用稳定声场的时反不变性和空间互易性，时间反转处理将接收的信号时反发射回去，使之在目标处聚焦，实现混响抑制、信混比提高，同时根据聚焦点的位置信息获取目标的距离和深度参数.时反处理将“海洋自身”而不是“海洋模型”引入信号处理，具有较好的宽容性，是常规匹配滤波和匹配场处理的进一步发展.在被动时反源定位计算机仿真的基础上，利用实验室波导，构建了一个物理时反实验系统，进行了主动时反探测实验.数值仿真和实验结果表明，时反处理可以对目标进行有效的定位.

Target detection based on time reversal processing

A novel approach based on time-reversal processing was proposed for weak target signals detection to enhance the sonar performance in shallow water.Using the time-reversal invariance and spatial reciprocity of the stationary sound field,time-reversal processing reverses the time of the received signal and retransmittes it back to focus on the target.In this case,the signal to reverberation ratio is improved with reverberation suppressed,and the target' parameters including range and depth are estimated according to the location of the focus.Time-reversal processing is robust for it is not the ocean data model but the ocean itself that is introduced into the signal processing.Time-reversal processing is a further development of matched filter and matched field processing.Based on the simulation of source localization using passive time-reversal processing,a physical time-reversal experiment system was built on the lab waveguide,and an active time-reversal detection experiment was performed.Both the simulation and experimental results show that the time-reversal processing can localize targets effectively.