Study of bandwidth for suppressing seawater backscattering based on frequency filtering
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摘要: 在激光雷达探测海水水下目标的应用中,基于频域滤波的信号处理技术可以抑制海水后向散射噪声.其中接收系统中滤波器带宽的大小不仅对后向散射起到抑制作用,而且对目标信号产生抑制作用.为了确定带宽取值范围,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.通过对接收信号在频域上进行仿真,归纳出接收系统滤波器带宽的最优设计方法.该研究结果为系统达到最佳信噪比奠定理论基础.Abstract: In the application of using lidar to detect undersea targets,a kind of signal processing technology based on frequency filtering is proved to be able to suppress the seawater backscattering effectively.The bandwidth of the filter in the receiving system doesn't only suppress the backscattering,but also supresses the target signal.In order to estimate the range of the bandwidth,the seawater transport model of the modulated-pulse lidar signal,and the frequency characteristic of the seawater backscattering signal and target reflecting signal were studied.After simulating the received signal on frequency domain,the optimum design method on the bandwidth of the filter in the receiving system was found and the optimum signal-to-noise ratio of the system could be established by this result.
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Keywords:
- laser technique /
- bandwidth /
- frequency filtering backscattering lidar
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