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Research On Atmospheric Lidar Signal Simulation System Based On HITRAN Database

Posted on:2020-02-24Degree:MasterType:Thesis
Country:ChinaCandidate:H L CuiFull Text:PDF
GTID:2428330572982124Subject:Electronic and communication engineering
Abstract/Summary:PDF Full Text Request
Atmospheric lidar can measure the optical parameters of aerosol and cloud,water vapor mixing ratio,carbon dioxide mixing ratio,nitrogen dioxide mixing ratio,ozone mixing ratio,sodium atomic density,potassium atomic density,iron atomic density,and calcium atomic density,atmospheric molecular density,temperature,wind filed.Atmospheric lidar plays an important role in the fields of atmospheric environmental monitoring,meteorological environment prediction and support,atmospheric science research and space physics science.In the design process of atmospheric lidar,it is necessary to use simulation to demonstrate the feasibility of the detection principle and configure reasonable atmospheric lidar parameters and provide reference for the devel-opment of atmospheric lidar.After the preparation of atmospheric lidar,it is still nec-essary to calculate some parameters that are difficult to measure.Therefore,this paper designs a set of atmospheric lidar signal simulation system based on HITRAN database.The implementation of the simulation system includes the following two parts:(1)A signal simulation model based on atmospheric lidar equations is established.The simulation model combines the atmospheric stratification model to simulate the at-tenuation of laser light by atmospheric molecules and aerosols during atmospheric trans-mission:the HITRAN database contains the absorption lines of atmospheric molecules,and the simulation model uses these spectral parameters to calculate the high precision of atmospheric molecules.The simulation model uses Rayleigh scattering to calculate the scattering coefficient of atmospheric molecules to laser.The atmospheric radiation transfer model Lowtran7 simulates the attenuation of aerosols on different wavelengths of laser light,so the simulation model combines the aerosol mode structure in Lowtran7.In addition,the simulation model can analyze the geometric factors in the Lidar system,system parameters such as interference filters,and the signal-to-noise ratio of the echo signals.(2)Based on the simulation model,the software development of the simulation system is mainly realized by using the C++program development language to achieve the atmospheric lidar signal simulation model.In addition,a human-computer inter-action interface of the simulation system was developed to increase the friendliness of human-computer interaction.The atmospheric lidar signal simulation system established in this paper simulates the intensity of echo signals under different system parameter configurations,and com-pares the simulation results with the measured results of NSSC vehicle 532nm Rayleigh scattering doppler laser radar.The error is within 4.5%,which indicates that the simu-lation system can simulate the echo signal well,and calculate the signal-to-noise ratio of the analog signal and the measured signal,and calibrate the optical system efficiency of the vehicle laser radar.
Keywords/Search Tags:Atmospheric detection, Lidar, Absorption spectrum, Simulation calculation
PDF Full Text Request
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