时间反转和逆时偏移混合法用于层状介质中目标检测和定位的声场分析

基于时间反转和逆时偏移混合方法用于分层介质中目标的声学检测和定位的原理,本文对分层介质中目标检测和定位的声场进行了数值分析。首先给出了声场分布数值仿真的方法和步骤,进一步采用单发多收和多发多收两种方式对单个目标和多个目标计算出其声场分布。数值仿真结果表明可以较好地实现对目标的检测和定位。比较发现,单发单收方式和多发多收方式都得到较好的结果,但多发多收方式计算耗时过多,因此不宜采用。另外,对多个目标的探测提出了改进方法。 

Acoustic field analysis of detection and location of targets in layered media by time reversal-reverse time migration mixed method

Based on the principle of time reversal (TR) and reversed time migration (RTM) mixed method, the numerical analysis of the acoustic field for detection and location of targets in layered media is carried out. The methods and steps of numerical analysis and simulation of acoustic field are proposed. The acoustic fields of single target and multiple targets are calculated by single emission-multiple reception way and multiple emission-multiple reception way. The results of numerical simulation show that detection and location of targets can be achieved well. Both emission and reception ways obtain good results. But multiple emission-multiple reception way takes too much time, so it should not be adopted. In addition, the TR-RTM mixed method in case of multiple targets are improved.