Robust time reversal focusing based on Maximin criterion in a waveguide with uncertain water depth  

作　　者：PAN Xiang WANG Nan ZHANG JiangFan XU Wen GONG XianYi 

机构地区：[1]Department of Information Science and Electronic Engineering, Zhejiang University [2]Hangzhou Applied Acoustic Research Institute

出　　处：《Science China(Physics,Mechanics & Astronomy)》2013年第10期1822-1832,共11页中国科学：物理学、力学、天文学（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.60872066 and 61171148);the National High-Tech R&D Program of China(Grant No.2009AA093601-3)

摘　　要：Time reversal processing （TRP） might be regarded as matched field processing with known environmental knowledge. However, the performance of TRP is degraded in an uncertain environment. A technique based on the Maximin criterion is pro- posed for enhancing the robustness of TRP in a waveguide with uncertain water depth. The relationship between the water depth and the focal spot translation is examined based on the waveguide-invariant theory. Then the time reversal transmissiou scheme with the Maximin criterion is performed to maximize the minimum transmission power on a target of interest. At the receiving end, coherent summation operation is carried out over the received data by a reception focusing bank. If it is neces- sary to enhance the target echo further, the iterative time reversal can be considered where the target echo corresponding to the first time reversal transmission is regarded as a secondary source. Numerical simulations and experimental results of the target localization in a waveguide tank have verified the effectiveness of robust TRP.Time reversal processing(TRP) might be regarded as matched field processing with known environmental knowledge.However,the performance of TRP is degraded in an uncertain environment.A technique based on the Maximin criterion is proposed for enhancing the robustness of TRP in a waveguide with uncertain water depth.The relationship between the water depth and the focal spot translation is examined based on the waveguide-invariant theory.Then the time reversal transmission scheme with the Maximin criterion is performed to maximize the minimum transmission power on a target of interest.At the receiving end,coherent summation operation is carried out over the received data by a reception focusing bank.If it is necessary to enhance the target echo further,the iterative time reversal can be considered where the target echo corresponding to the first time reversal transmission is regarded as a secondary source.Numerical simulations and experimental results of the target localization in a waveguide tank have verified the effectiveness of robust TRP.

关 键 词：ROBUSTNESS time reversal processing uncertain water depth WAVEGUIDE SONAR 

分 类 号：TN814[电子电信—信息与通信工程] TP18[自动化与计算机技术—控制理论与控制工程]