Infrared and Laser Engineering, Volume. 49, Issue S2, 20200185(2020)
Research on underwater transmission characteristics of subcarrier modulated pulse lidar
In the underwater application of lidar, the underwater transmission of laser light is complicated and variable due to the absorption and scattering of light by water, especially the noise caused by backscattering will reduce the contrast of the target, and the target echo even will be drown, resulting in big challenges of water downward laser echo detection. The subcarrier modulation technology can effectively improve the underwater detection performance of the lidar system and increase the signal-to-noise ratio of the target echo signal. Based on the Monte Carlo method, an improved underwater transmission model of a subcarrier-modulated pulsed lidar was proposed. The effects of seawater attenuation coefficient and passband on system performance were studied. Simulation results show that compared with traditional lidar, the environmental parameters of the water body and the selection of the passband during filtering have a greater impact on the underwater detection performance of the system; the subcarrier modulation technology can improve the target signal-to-noise ratio and measurement accuracy, it effectively improve the system performance.
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Yuan Zhi′an, Wang Ling, Xu Ke, Deng Bin, Liu Xinpu, Zhu Jiahua, Ma Yanxin. Research on underwater transmission characteristics of subcarrier modulated pulse lidar[J]. Infrared and Laser Engineering, 2020, 49(S2): 20200185
Category: 激光器与激光光学
Received: May. 19, 2020
Accepted: Nov. 10, 2020
Published Online: Feb. 5, 2021
The Author Email: Yanxin Ma (mayanxin@nudt.edu.cn;朱家华|zhujiahua1019@hotmail.)