时间反转处理用于掩埋目标检测

研究了有PS(Probe Source)源发-收时间反转在强混响背景下对掩埋目标的检验问题。所提出的发-收互动时反处理是:在目标处放一个PS声源产生引导信号,SRA(source Receiver Array)接收引导信号,并对接收到的信号做物理时反(即多路径补偿反波束形成),将声能聚焦在目标位置处,对SRA接收到的目标散射回波做与发射聚焦互动的接收聚焦(即多路径补偿波束形成),得到聚焦后的目标回波,实现发-收互动的聚焦。并对常规BS(Broadside)发射检测(没有时间反转)和时间反转检测两种方法各自的性能进行了比较。实验室波导掩埋目标实验数据处理验证了理论分析的结论,并证明时间反转检测比常规BS发射检测可得到更大的信混比,从而提高了掩埋目标的检测概率。

Detection of objects underneath the water-sediment interface based on time reversal processing

The hypothesis test of detecting presence and absence of a target in a highly reverberation environment using techniques of time-reversal focusing with interaction of transmission and reception was studied.Time-reversal (TR) focusing with interaction of transmission and reception is as follows:a PS is located near the object and generates signal,the SRA(Source Receiver Array) receives the signal transmitted by the probing source (PS) and focuses the signal at the location of the object by physical TR focusing (i.e.,inverse beamforming with multi-path compensated). TR transmission array and reception array interactively focus the echo scattering by the object with algorithmic TR focusing (i.e.,beamforming with multi-path compensated).Meanwhile the conventional BS (broadside) transmission detection and TR detection are compared.The experiment which was operated on Laboratory Waveguide was carried on to prove the analyses,and got more gain on signal-to-reverberation ratio than the conventional BS transmission detection.