Research On Polarization Characteristics And Detection Technology Of Dark Waves On Water Surface

Aiming at the current difficulties in detecting the sea surface wave height field formed by the motion of the vehicle by visible light,combined with the advantages of polarization detection in sea surface detection,the research work on polarization detection and polarization images is carried out to achieve the purpose of identifying the target wake information.The research results of this paper are mainly in the following two aspects:1)The analysis of the change of optical polarization characteristics in the propagation of sunlight is carried out.By analyzing the influence of the atmosphere on the polarization state of sunlight,the atmospheric pass rate formula of the polarization information in the atmospheric zone is obtained.Then,by analyzing the wave spectrum theory and common wave spectrum models,the classical PM wave spectrum and the coupling of the background sea surface are completed.Geometric simulation and;at the same time,for the detection of Kelvin wake,the hydrodynamic composition of the wake is analyzed through the potential flow theory,and the influence of the wake on the speed of the vehicle,the depth of motion and other factors is explored,and theoretical modeling and simulation are carried out;finally;The change of the polarization characteristics of sunlight from entering the atmosphere to the propagation between the detectors is studied.Combined with the characteristics of solar radiation and atmospheric transmission,the Cox-Munk model and the shading effect are introduced to determine the polarization state caused by the reflection of light through the sea surface medium.The sea surface polarization model of the full link between sea and air is established.2)Research work on polarization image processing and wake detection technology is carried out.Firstly,an adaptive polarization detection device is proposed for the unavoidable problem of sea surface flare,which can detect targets in the target area of sea surface flare,and obtain images after the flare is suppressed to a certain extent.Secondly,the polarization images are fused,combined with the polarization characteristic parameters,the polarization images in four directions are fused,which improves the expression of the relative detail information of the image,and enables the observation of the details of the waves more intuitively.Finally,for Kelvin wake,a feature extraction method based on Gabor wavelet transform and dual-tree complex wavelet transform is proposed,which completes the detection of Kelvin wake from the image level.Aiming at the unavoidable problem of sea surface flare,an adaptive polarization detection device is proposed first,which can detect the moving target in the flare target area on the sea surface,and obtain the image after the flare is suppressed to a certain extent.Secondly,the polarization images are fused,combined with the polarization characteristic parameters,the polarization images in four directions are fused,which improves the expression of the relative detail information of the image,and enables the observation of the details of the waves more intuitively.Finally,for Kelvin wake,a feature extraction method based on Gabor wavelet transform and dualtree complex wavelet transform is proposed,which completes the detection of Kelvin wake from the image level.