Research On The Technology Of Outdoor Visible Light Target Simulato

Visible target simulator is a system that uses simulated scenery to test the performance of optoelectronic imaging equipment.The system uses visual simulation technology to provide feature targets,which can effectively improve the efficiency of optoelectronic imaging system and reduce the testing cost.It plays an important role in the field of military equipment testing in various countries.In this paper,we design and develop a visible target simulator based on LED display according to the current requirements for performance testing of optoelectronic imaging systems in the field,and analyze the influence of the transmission characteristics of the feature target in the field environment on the minimum resolvable contrast(MRC)and the action distance of the visible imaging system.Firstly,we clarify the formation scheme of the target simulator system with LED display as the background light source,and generate USAF 1951 resolution test targets for outfield experiments according to the performance test standard of optoelectronic imaging system.The energy attenuation and MRC detection principle of visible light radiation energy in the field environment is analyzed theoretically.Based on the degraded resolution pattern simulated by the external field transmission environment and atmospheric modulation transfer function(MTF),the MRC value of visible light imaging system in a specific atmospheric environment is obtained,and the action range of photoelectric imaging system is predicted.Theoretical and simulation studies show that water vapor,carbon dioxide,and aerosol particles are the main factors that cause the attenuation of visible light radiation energy;and the atmospheric transmittance increases with the increase of observation altitude and decreases with the increase of zenith angle.The modulation transfer function calculated according to the specific atmospheric components,observation altitude and zenith angle can well simulate the degradation of the resolution target image in the atmosphere,and the MRC test curve can be established according to the simulation results to estimate the action distance of the optoelectronic imaging system.