Modeling, Simulation And Experimental Research On Millimeter-wave Radiation Characteristics Of Water Surface Vegetation

Compared with infrared and visible light,millimeter wave(MMW)detection has higher accuracy,stronger penetration,stronger anti-interference ability when detecting targets all-weather and all-day.There are obvious differences between the radiometric characteristics of different surface targets.Therefore,focusing on the application scenarios of surface targets detection and pollution early warning,the main research are as follows:(1)The basic principles of MMW radiometric theory,radiometer system and calibration technology are introduced.According to the transmission characteristics,the radiometric characteristics of sky and water are carried out under different weather conditions,and the multilayer dielectric model of surface targets is explored.The feasibility of using MMW radiometers to detect surface targets is analyzed to lay the foundation for the following.(2)On the basis of considering the background and targets,studies on the radiometric characteristics of surface targets are carried out.With aquatic vegetation as the key point,the radiometric characteristics of aquatic vegetation are studied based on the multilayer dielectric model.The radiometric images of vegetation leaves are simulated for further analysis.(3)The influence of water content on the complex permittivity of vegetation is analyzed,and radiometric characteristics of aquatic vegetation under different conditions are explored,so as to provide reference for subsequent experimental research on aquatic vegetation.For the practical application of real-time monitoring of aquatic vegetation,a simulation method of aquatic vegetation detection system based on MMW radiometer is proposed,which improves the detection efficiency.It also provides another way of thinking for the detection and identification of aquatic vegetation.(4)The field experiments of aquatic vegetation are carried out and the data are combined with established models and measured data of non-vegetation targets,the radiometric characteristics of aquatic vegetation under different conditions are studied.The growth radiometric characteristics of cyanobacteria are explored,so as to provide early warning real-time pollution monitoring.The research on aquatic vegetation provides the correctness of theoretical model and lays foundation for the establishment of early warning mechanism of surface targets pollution.