Image Simulation Technology Of Infrared Warning For Missile Boost Plume

The priority mission of missile warning is to detect incoming missiles timely,and then to identify, track and intercept the observed objects. In the early stage ofmissile launch, the infrared detector of warning satellites can detect the target,according to the different shapes and brightness of missile plume at different heights,and they can determine whether there are missile launchers or not, and what type ofmissiles launched. Then they can measure the trajectory of the missile’s activesegment roughly and send out early warning in time. According to missile’sflameout point position and velocity information, they can calculate the trajectory ofthe missile mid-segment and provide a relatively enough time for ground missileintercept system.The infrared radiation generated by missile plume is the main basis of detectingand identifying by early-warning satellites. In the boost phase the infrared radiationof the missile is mainly from its exhaust plume and its background is mainly flyingclouds. In this paper, starting from studding the characteristics of ballistic missilesplume, and the missile plume properties were studied in detail. This paper describesthe corresponding changes of ballistic missile plume flow structure along with thechanges about ballistic missile velocity, altitude and ambient atmospheric density.Based on the needs of engineering modeling, this paper creates three-dimensionalsimulation images about the missile plume, and simulates the missile plume’sgeometry and temperature field characteristics. Through transforming among spaceand the image plane of the coordinate system conversion, they make thethree-dimensional simulation images projected onto the camera focal plane. Withoutconsidering the impact of atmospheric background and atmospheric transmissionattenuation, they generate ideal simulation images of two-dimensional, whichprepares for the next target identification and detection, etc. The work in this paperprepares preparatory work for the next target identification and detection, etc.After the plume simulation images established, the paper describes variouscoordinate systems and coordinates conversion in detail. With the local coordinatesystem and the global coordinate system to characterize the position and orientationof missile plume and onboard camera. We can obtain the mathematical model of thecoordinate conversion system through calculation. Then this paper achieves thecoordinate transformation process through Matlab software programming. Then thispaper makes three-dimensional simulation images projected onto the focal plane ofthe camera to generate the two-dimensional simulation images in ideal case, andalso researches the simulation images. When missile plume infrared radiation transfers in the atmosphere andcombined with the temperature characteristics of the missile plume, this papercalculated the transmission of energy attenuation caused by infrared radiationtransfers in the atmosphere, and the energy value of the camera entrance pupilfinally from the radiation transfers. By calculating the different observation distancebetween onboard camera and the missile plume, we can get different energy valuesat the entrance pupil. They provide data support for the plume image analysis. In thelast chapter, this paper also analyzes the image chain, the system modulationtransfer function and the detector noise’s effect on imaging quality, which make thewhole simulation process more accurate and realistic.