布尔混沌调制激光雷达水下目标成像实验研究

Experimental Study on Underwater Target Imaging of Boolean Chaos Modulated LiDAR

在激光雷达的水下目标探测中,浑浊水体中悬浮颗粒对激光的吸收和散射作用,使得激光在水中的传输严重衰减。尤其是后向散射所造成的噪声会降低目标对比度甚至淹没信号回波。载波调制技术可以有效抑制后向散射,提高目标回波信号的信噪比。文章将布尔混沌信号作为载波调制信号,基于其内禀高频强度调制特性,构建了布尔混沌调制激光雷达水下成像系统,并在实验室水箱环境下,对衰减系数不同的浑浊水体中的目标物体进行了三维成像实验研究,对比了不同水质中的目标物体三维成像效果。

In the underwater target detection of LiDAR, the underwater transmission of laser is seriously attenuated due to the absorption and scattering of laser by suspended particles in turbid water, especially the noise caused by backscattering will reduce the target contrast and even drown the target echo signal. The carrier modulation technology can effectively suppress backscattering and increase the signal-to-noise ratio of target echo signal. In this paper, the Boolean chaotic signal was used as the carrier modulation signal. Based on its inherent high-frequency intensity modulation characteristics, an underwater imaging system of Boolean chaotic modulation LiDAR was constructed. The three-dimensional imaging experiments of target objects in turbid water with different attenuation coefficients were carried out in the laboratory water tank environment, and the three-dimensional imaging effects of the target in different water quality were compared.