激光雷达在海洋水下目标探测中存在主要的问题是，海水对光的后向散射作用导致目标对比度的严重降低。
The main disadvantage of using LIDAR for the detection of objects in the ocean is that the backscattering clutter limits the contrast of underwater target reflections.
在接收端，通过频率滤波实现对编码信号的提取，由编码信号的信号处理实现激光雷达水下目标探测。
At the receiver, the modulated optical carrier can be examined from a frequency filter to render target detection.
文章分析了调制脉冲激光雷达探测信号水下传输模型，研究了海水后向散射信号以及目标反射信号的频域特性。
The article analyses the seawater transport model of the modulated-pulse LIDAR signal, and the frequency characteristic of the seawater backscattering signal and target reflecting signal are studied.
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