独立成分分析方法在水下激光雷达中的应用  

Application of Independent Component Analysis Method in Underwater Lidar

作　　者：王振[1] 樊超阳 杨苏辉 刘欣宇 徐震[2] Wang Zhen;Fan Chaoyang;Yang Suhui;Liu Xinyu;Xu Zhen(The 34th Research Institute of China Electronics Technology Group Corporation,Guilin 541004,Guangxi,China;Key Laboratory of Information Photonics Technology,Ministry of Industry and Information Technology,Beijing Institute of Technology,Beijing 100081,China)

机构地区：[1]中国电子科技集团公司第三十四研究所,广西桂林541004 [2]北京理工大学信息光子技术工业和信息化部重点实验室,北京100081

出　　处：《光学学报》2024年第18期176-183,共8页Acta Optica Sinica

基　　金：国家自然科学基金(61835001,12374400)。

摘　　要：采取有效方法去除回波信号中的散射噪声可以显著提高水下激光雷达系统的测距精度和成像质量。将快速独立成分分析(FastICA)方法应用到水下激光雷达系统,利用盲信号分离(BSS)算法中的独立成分分析(ICA)方法去除水下激光雷达回波信号中的散射噪声,基于目标回波和后向散射信号的四阶统计量差异分离目标回波和后向散射噪声,有效提高了系统测距精度和成像质量。Objective As the demand for ocean development continues to increase,underwater target detection technology becomes increasingly crucial.Radar offers numerous advantages over sonar,which currently dominates the ocean detection field.Radar provides higher imaging resolution and better anti-interference capability and features a compact detection structure.It can be deployed on ships,aircraft,or satellites,offering high detection efficiency and promising applications in ocean exploration.However,due to water’s scattering and attenuation effects on lasers,underwater lidar echo signals often exhibit significant weakness and backscattered noise.This issue is exacerbated in turbid waters,where water attenuation and backscattering combine to obscure target signals.Simply increasing laser power can intensify backscattering noise,saturating the receiving system without improving overall performance.Backscattering noise severely impacts detection accuracy and imaging quality in underwater lidar systems.Common methods to mitigate water-induced backscattering noise include distance gating,polarization detection,spatial filtering,and carrier modulation.These methods leverage differences in time distribution,polarization characteristics,spatial distribution,and frequency characteristics between signal light and scattered light to suppress unwanted scattering.Currently,underwater target detection radar faces challenges such as limited detection range and low resolution.Addressing these challenges by integrating advanced backscattering noise suppression technologies is crucial for enhancing underwater lidar performance.Our study applies the fast independent component analysis(FastICA)algorithm to process underwater lidar echo signals,aiming to effectively remove backscattering noise and thereby improve ranging accuracy and imaging quality.Methods Due to water’s scattering effect,photons received by underwater lidar detection systems typically consist of three components:1)photons directly reflected by underwater targets;2)bac

关 键 词：海洋光学 水下激光雷达 独立成分分析 后向散射 

分 类 号：TN911.74[电子电信—通信与信息系统]