Research On Visible Light-Infrared Radiation Characteristics Of Real Land And Sea Environment Background

The visible light-infrared radiation characteristics of the actual land and sea environment background have important application and theoretical guiding value in the field of civilian and military remote sensing.In the military field,providing environmental background thermal radiation characteristic parameters provides basic data support for target recognition and detection.In the civil field,it can be applied to special ecological environment abnormal monitoring,forest protection and other scenarios.This paper mainly analyzes and studies the visible light-infrared background radiation characteristics of the real South China Sea marine environment,the typical land environment of China’s land and the regional natural geographic environment(East China and Northern Tibet),combined with Digital Elevation Model(DEM)data The theoretical value and experimental measurement of infrared radiation in Dachaidan area are verified.The main results of this paper are summarized as follows:1.Research on background radiation characteristics of real marine environment.The actual marine environment is complex and changeable,and a large amount of real data is needed to support research.This paper uses the European mesoscale reanalysis data set to obtain the actual marine environmental data(wind speed,wind direction,temperature,atmospheric profile)of the South China Sea from 2016 to 2019,and establishes a multi-physical temporal and spatial distribution database of real marine environmental elements in different seasons and specific moments.Based on this,the emissivity and Bidirectional Reflectance Distribution(BRDF)models that conform to the actual environment of the South China Sea are obtained.In addition,the influence of seawater spectral refractive index and foam environment on the actual sea surface emissivity and BRDF under high sea conditions is considered.Finally,combined with the above research,the actual marine environment background of the South China Sea is calculated and analyzed in the visible light-infrared band radiation characteristics in different seasons and specific moments.2.Research on background radiation characteristics of typical surface environment.First,use MODIS(MODerate Resolution Imaging Spectroradiometer,MODIS)satellite data to analyze the distribution of land surface types in my country,select grassland,cultivated land,mixed forest land,wasteland,savanna,and permanent ice and snow six typical land surfaces,and their directions Emissivity and BRDF temporal and spatial distribution characteristics are analyzed.Secondly,the atmospheric radiation software is used to calculate and analyze the radiation characteristics of the atmospheric environment on different surfaces.Finally,based on the above research,the visible light-infrared spectrum radiation characteristics of the typical surface environment in different seasons are calculated and analyzed.3.Research on the radiation characteristics of regional natural geographical environment.This paper makes a statistical analysis of the temporal and spatial distribution characteristics of the BRDF,directional emissivity and surface temperature of the actual natural geographical environment in East China and North Tibet in different seasons and at different times.A local atmospheric environment model was constructed,considering the influence of atmospheric environmental radiation,the theoretical calculation of the background infrared radiation characteristics of the actual natural geographic environment in East China and Northern Tibet was carried out,and the four seasons and day and night characteristics were analyzed.4.Field experiment verification of infrared radiation characteristic model.First,use MODIS data and DEM elevation data to study the physical geographic information of the Dachaidan experimental study area.Secondly,the experimental plan of Dachaidan area is described,and the experimental data is processed and analyzed.Finally,based on the elevation data,the theoretical calculation and analysis of the terrain parameters(slope,aspect)of the area are carried out,and a surface radiation calculation model considering the influence of terrain undulation factors is proposed,and the environmental background radiation characteristics of Dachaidan are calculated and analyzed.The experimental measurement data and the theoretical calculation results under the same test conditions are mutually verified,and the two are in good agreement.The above-mentioned research results,the visible light-infrared radiation characteristic data of the actual sea and land environment in different time and space,can provide reference and supplement for remote sensing test,fixed ground station test,and external field surface test.