Research On Detection Ability Of Infrared Early Warning Satellite For Target In Ballistic Midcourse

Infrared early-warning satellite plays an important role in ballistic missile defense system.At the same time,the midcourse phase is the longest period in the entire missile movement.The research of the infrared early-warning satellite's ability to detect targets in midcourse not only provides useful information for the defense of ballistic missiles,but also provides a reference for the design of early-warning satellite.In this paper,through analysis and calculation of the infrared radiation characteristics of the targets in midcourse,the ability of early-warning LEO satellites to detect midcourse targets was studied.The main work completed in the paper are as follows:On the one hand,the infrared radiation characteristics of the midcourse targets that affect their detection capabilities were studied.First,by analyzing the radiation peak wavelengths of radiation sources and the influence of atmospheric transmittance on radiation transmission,the detection band of early-warning LEO satellites for midcourse targets was determined.Then,the self-radiation and reflected radiation characteristics of the target in midcourse were mainly analyzed and calculated.The models of radiation effects on midcourse targets of various radiation sources(such as solar,earth,atmosphere,clouds)in the detection environment of early-warning LEO satellites were established.And the irradiance on the warhead generated by each radiation source was calculated.Besides,a model of the reflected radiation of target in midcourse was established to calculate the radiation intensity that warhead reflected from each radiation source in the detection environment.Furthermore,the models of the self-radiation of warhead target and balloon decoy were established to calculate the targets' own radiation intensity.At last,according to the calculation results of targets' infrared radiation,open scene graph was used to simulate the radiation field of the midcourse target in the deep space background.On the other hand,based on calculation and analysis of the infrared radiation the midcourse target,the ability of early-warning LEO satellite was studied in term of.synthetic signal-tonoise ratio,detecting distance and detection rate.Firstly,based on the diffraction effect of early-warning LEO satellite imaging system,a cumulative distribution function CDF was introduced to modify the integrated signal-to-noise ratio calculation model.And the difference in SSR between before and after correction was compared.Secondly,according to the calculation results of the midcourse target radiation characteristics,combined with the diffraction effects of the early-warning satellite imaging system,the traditional detection distance model was revised.And the variation of the detection distance of the early-warning satellite with the detection angle was analyzed.Thirdly,the threshold noise voltage under different detection conditions was calculated and analyzed.Combined with the detection probability model,the detection probability of the midcourse target by the early-warning LEO satellite at different false alarm rates was calculated.Finally,the scene of early-warning LEO satellite detecting the midcourse target in the deep space background was simulated by the system of the penetration simulation experiment set up by the research group.