Abstract: There are severe Multipath Effects,Doppler Spread and noise in underwater acoustic channels. Time Reversal makes use of sound wave reciprocity principle and time reversal invariance of wave equation.If the received sound signal was reversed the time and retransmitted back, the signal would focus on the original acoustic source position. This may effectively eliminate the Multipath Effects of underwater acoustic channel, corrects the signal. Repeated time reversal iterations can obviously enhance the focus signal energy.The methods of DORT and MUSIC are on the basis of time reversal iteration.They analyze the time reversal operator and form theirown algorithm. Using the methond of DORT or MUSIC may realize the active detection to underwater target and locate the specific location of target.
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刘敏,曹燕,韦岗. 基于时反处理法的水下目标探测研究[J]. 科学技术与工程, 2009, 9(21): . LIUMin, CAOYan, WEIGang. Active Detection to Underwater Target Based on Time Reversal Technique[J]. Science Technology and Engineering,2009,9(21).