Research On Oceanic Lidar Retrieval And Data Processing Technology

In recent years,with the continuous deepening research of the maritime power strategy,China has paid more attention to the issue of integrated marine management.Seawater optical properties are important aspects of ocean characterization,and they also have important guiding significance for global material cycle and climate change.Oceanic lidar is a new type of active optical remote sensing device with high-precision,long-term and global-scale detection ad'vantages,receiving increasing attention in marine applications.Oceanic lidar technology has been developed for nearly 50 years.However,China's oceanic lidar is still far from commercial application.Elastic scattering lidar technology is currently most commonly used in marine filed and easy to implement,but their detection accuracy is limited by assumptions.The development of inversion algorithms and data processing technologies suitable for elastic scattering lidar is of great significance to further promote the active detection of marine technology into the level of commercialization and high precision.This paper is devoted to the development of retrieval algorithm and data processing system of elastic scattering lidar.Based on the quasi-single-scatter approximation model,data inversion model of elastic scattering lidar was established.Furthermore,the errors of the elastic scattering lidar system are analyzed and processed,and the difficulties affecting the detection accuracy of the elastic scattering lidar are emphasized.The main research contents include:The data inversion model of elastic scattering lidar was established.Based on the data characteristics of the elastic scattering lidar returns,the system response,low signal-to-noise ratio,and other issues that may limit the detection depth and accuracy of the lidar system in practical detection are analyzed.The inversion algorithms applicable to different water types are studied.An integrated application processing software for marine lidar,which integrates data acquisition,system calibration and data inversion,is constructed.This system is highly compatible with the elastic scattering lidar system of Zhejiang University and can achieve all the required functions.The ship-borne lidar data of the Yellow Sea was studied,and the three-dimensional distribution of optical parameters of seawater in these areas was demonstrated.The research on the algorithm and data inversion of the elastic scattering lidar system involved in this article provides a powerful method and accurate results for the global upper ocean detection and monitoring,and has a certain promotion effect on the active remote sensing of the ocean,providing support to ocean governance and supervision with valuable data results.