ACOUSTIC PULSE-COMPRESSION USING PASSIVE PHASE-CONJUGATE PROCESSING
ACOUSTIC PULSE-COMPRESSION USING PASSIVE PHASE-CONJUGATE PROCESSING
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DOI：
10.1121/1.408482
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发表时间：
1994-03-01
影响因子：
2.4
通讯作者：
DOWLING, DR
中科院分区：
文献类型：
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作者：
DOWLING, DR
被动相位共轭（PPC）处理包括使用第一到达，从一个脉冲流穿过一个复杂的折射介质，作为一个过滤器为以后的脉冲到达。它与真正的“有源”相位共轭的联系在于调用反向传播的互易性。当中间声介质缓慢变化时，即使在复杂的多径环境中将声源和接收器分开，PPC处理器也会产生明确的时间峰值。PPC处理器输出中的时间副瓣可以通过增加接收器数量和相干求和来抑制。最近的深海声传播测量（IWAC '90）用于评估衰落多径声信道中的PPC处理。在460赫兹下，在272.3公里的范围内，压缩峰平均持续约半小时。发现PPC处理器峰值的衰落符合波在随机介质中传播的抛物方程二阶矩理论。
Passive phase-conjugate (PPC) processing consists of using the first arrival, from a stream of pulses that have traversed a complex refractive medium, as a filter for later pulse arrivals. Its connection with true ''active'' phase conjugation lies in invoking reciprocity for the backpropagation. When the intervening acoustic medium changes slowly, the PPC processor creates an unambiguous temporal peak even when a complex multipath environment separates the acoustic source and receiver. Temporal sidelobes in the PPC processor output can be suppressed by increasing the number of receivers and coherently summing their output. Recent deep-ocean acoustic propagation measurements (IWAC '90) are used to assess PPC processing in a fading multipath acoustic channel. For a range of 272.3 km at 460 Hz, the compressed peak persists on average for about half an hour. Fading of the PPC processor peak is found to be consistent with parabolic-equation second-moment theory for wave propagation in a random medium.