Research On Sensor Band Optimization Of Ground-based Infrared Observation System

The continuous improvement of the detection target's mobility and camouflage ability has further hindered its detectability,so the detection performance requirements of sensors have also been continuously improved.Terrestrial infrared observation systems play an important role in environmental,military and scientific research.Selecting a reasonable and accurate sensor observation band can accurately improve the detection performance of the ground-based infrared detection system,this thesis starts from the spectral characteristics of the target radiation of the rocket tail,the radiation characteristics of the earth / atmosphere background environment,and the earth observation system.Perform comprehensive evaluation index analysis and select reasonable and accurate sensor observation bands.The main research contents and achievements of the paper are as follows:(1)The scattered radiation characteristics and models of typical underlying surfaces were studied.The scattering model of non-Lambertian underlying surface is studied in detail,and its key parameter "mirror-diffusion ratio" is derived and calculated.Based on statistical analysis of the measured data,a scattered radiation model is established,and scene simulations are performed for different wavelengths of the infrared remote sensing scene containing ice,based on the correlation between atmospheric transmission and the waveband.(2)The infrared radiation characteristics of rocket tail targets were studied,and the tail targets at different heights were simulated.The infrared radiation image of the rocket tail flame is based on the detection angle of view through the overlap of the infrared radiation of the engine flame.The changes in the shape and the brightness of the tail flame target at different altitudes are studied.(3)The physical overlap of the tail flame target and the underlying scene is studied to obtain a more realistic infrared composite scene.The types of underlying scenes include Qinghai Lake with ice,City,Desert,Mountain and Water.(4)The research is carried out on the band around 2.7?m.In the range of 2.5 ~3?m,with 2.75?m as the center of the band,it is gradually widened.The background and target of different bands are physically superimposed to obtain a composite scene.Comprehensive evaluation of statistical features and texture features,and finallyselected a reasonable and accurate sensor detection band range of 2.690-2.810?m.(5)Developed scene simulation and physical overlay software.These include ground-based infrared background simulation software,typical underlying surface physical superposition software,and Qinghai Lake ice scene simulation software.This software can implement scene simulation and physical superposition functions according to the input parameters set by the user.By analyzing and evaluating the composite scene simulation results in different bands,a reasonable and accurate sensor detection band can be obtained in the end.