Simulation And Analysis Of Imaging Characteristics Of Space-based Infrared Detection System In Complex Environment

With the rapid development of space-based detection technology,space-based infrared detection system has become one of the strategic weapons for detecting and identifying missile targets.Space-based infrared detection systems usually develop corresponding detection strategies based on the infrared imaging characteristics of missiles in complex detection backgrounds such as earth,cirrus,and starry sky.Therefore,studying the imaging characteristics of space-based infrared detection systems in complex environments and establishing a digital simulation platform for space-based infrared detection system can not only provide theoretical basis for the development of space-based infrared detection systems,but also serve the field of intercontinental missile anti-detection.The main work of this thesis is to establish infrared simulation models that are convenient for real-time rendering based on the infrared imaging characteristics of missile targets and complex detection environments.What's more,this thesis completes dynamic simulation of all elements of the space-based infrared detection scene through the rendering engine and studies the impact of different environmental conditions on the detection of missile targets and countermeasures.The specific work is as follows:(1)Establishing infrared imaging models of missile targets and complex detection environments.This thesis first analyzes the infrared imaging characteristics of the missile target in the space-based infrared detection system based on the space-time relationship between the satellite detector and the missile target and the infrared radiation characteristics of the missile under different motion states.Secondly,the infrared remote sensing image of the earth is reconstructed by relevant algorithm segmentation,and the surface infrared radiation model and high-level cirrus cloud model that are efficient and convenient for real-time rendering calculation are established to complete the simulation work of the detection environment of the missile boost.Finally,combined with the spectral feature classification and star table,the algorithm of fast conversion of stellar coordinates and fast rendering of stellar models are implemented to complete the simulation work of the mid-range detection environment.(2)Establishing a digital simulation platform for space-based infrared detection system and analyzing infrared imaging characteristics of space-based infrared detection system in complex environments.This thesis first establishes a digital simulation platform for space-based infrared detection system through the OSG rendering engine and completes dynamic simulation of all elements of space-based infrared detection scenes in complex environments based on the full link model.Secondly,based on the image contrast and the comprehensive signal-to-noise ratio,the influence of different detection environments on the infrared imaging characteristics of missile boost is analyzed.Meanwhile,the main interference factors and countermeasures for detecting and identifying the missile booster under different detection environments are analyzed too.Finally,based on the infrared imaging characteristics and related simulation diagrams of the missile's middle section,the effects of detection distance and star brightness on the detection and identification of the missile's middle section are analyzed.The digital simulation platform for space-based infrared detection system and the infrared imaging characteristics of targets in complex environments studied in this thesis can provide theoretical basis and simulation analysis tools for space-based infrared detection systems to track and identify missile targets in actual combat.