Research On Feature Information Extraction Technology Of Laser Image Of Sea Surface Wave Streak Tube

In recent years,with the deepening of the development of marine resources,the detection and research of marine information has gradually become the focus of marine research.Sea surface waves are one of the important carriers of ocean information.Through research and detection of sea surface waves,hydrological and meteorological information of the ocean can be obtained,which can provide help for maritime transportation.However,the accuracy of traditional buoy detection methods is limited,and equipment must be installed at the target location,which is poor in flexibility.The study of new ocean information detection methods has very important significance and value.Striped tube lidar has the characteristics of high imaging accuracy,fast imaging speed,no need to contact the target at close range,and flexible use.Therefore,it can be used for sea surface wave detection to solve the shortcomings of traditional buoy detection;but the sea is extracted from the striped tube lidar echo data.The characteristic parameters of surface waves are more difficult.This thesis will focus on the method of extracting sea surface wave characteristic parameters from the echo data of the striped tube lidar detecting sea surface wave.First,Based on the principle of sea surface wave modeling,various modeling methods are analyzed,and a hybrid superposition model based on Longuet-Higgins linear model and two-dimensional fractal model is proposed and established,and the advantages and disadvantages of each model are compared.The analysis results show that the hybrid superposition model has richer small-scale wave components and greater roughness than the single Longuet-Higgins linear model;compared to the twodimensional fractal model,its large-scale wave components are richer and have a real sea surface Characteristics of waves.Secondly,the working principle of the striped tube lidar is introduced,the echo equation of the striped tube lidar is studied,the interaction between the laser and the sea surface wave is analyzed,and the principle of coupling between the lidar equation and the sea surface wave model is studied.Model coupling method.Thirdly,the data processing method of the striped tube lidar is discussed.The sea surface wave model is coupled with the striped tube lidar equation,and the lidar echo simulation model of the sea surface wave is obtained.A method for extracting the wavelength characteristics and frequency spectrum characteristics of the sea surface wave from the echo data.This method can effectively extract the wavelength characteristics and spectral characteristics of sea surface waves.Finally,an experimental platform was built,and the lidar echo intensity varies with the incident angle under low wind speed and small wind field.The experimental results show that the lidar echo intensity is mainly affected by the incident ang le under low wind speed and small wind field.,Which is consistent with the simulation results.A one-dimensional regular wave imaging experiment was carried out indoors,and the wavelength of the regular wave was extracted from the intensity image.An ou tdoor sea surface experiment was carried out.The range image and intensity image characteristics were extracted from the original experimental data,the wavelength characteristics were extracted from the intensity image,and the wavelength and frequency spectrum characteristics were extracted from the range image.