Research On The Design Of Evaporation Duct Wireless Measurement System And Applicability Of The Prediction Models

The electromagnetic wave propagates without media.Therefore,it can be commonly used in the information transmission and detection of the atmosphere and space.The development of electromagnetic wave propagation theory has contributed to the application of electromagnetic wave.The oceanic evaporation duct has a significant impact on the propagation of the electromagnetic wave.Since the marine environmental effects has become a research topic,the study of evaporation duct is crucial for the theoretical research and the engineering.It can be applied to the marine radar,meteorology,communication,navigation,etc.This thesis is primarily focus on the cause of the evaporation duct.By simulating the different evaporation duct models,their parametric sensibility can be compared.Furthermore,the wireless evaporation duct measurement system is designed for analyzing the pros and cons of models.This system is based on the ZigBee technology,facilitating with attitude sensor,THP(temperature,humidity & pressure)sensor,radio and applying Kalman filter for the attitude algorithm,the marine meteorological parameters at different altitudes can be measured and the real-time evaporation duct over the sea can be obtained.It can be an important supplement for the existing measurement methods.By using the experimental result of the measurement system,the air-sea flux algorithm and the optimized model of the dimensionless stability functions under different experimental conditions,the result of different meteorological parameters can be studied.Visualization software makes it possible to receive and process experimental data,simultaneously,output the evaporation duct model.After collecting the sea-air boundary layer data,it compared the measured data profile with dimensionless stability functions summarized by another thesis.Then,it analyzed the dissimilarity of the dimensionless stability functions,the profile of refractive index and the result of the evaporation duct model under different stable condition.Finally,it discussed the applicability of different models and the dimensionless stability functions.The innovations of this paper including:1.Designing a wireless measurement system of evaporation duct which can measure the meteorological parameters' profile and the corrected index of refraction in the real-time.It can provide reliable data for modifying the evaporation duct model and verifying the similarity theory of the air-sea boundary layer.2.Based on the measured data,the pros and cons of the evaporation duct model were verified,which provide method and data for the selection of dimensionless stability functions in accordance with China's offshore sea conditions.3.Comparing the dimensionless stability functions proposed by different scholars.Applying the sensitivity analysis to different models of dimensionless stability functions.Studying the influence of key meteorological and hydrological input parameters of the model.It provides a reference for further optimization of hardware design and error control of input parameters of the model.