Research On Radiation Characteristics And Target Imaging Simulation Technology Of Infrared Decoy

Infrared decoy is an important device that can effectively deceive and interfere with infrared guided weapons.In modern warfare,infrared decoy interference has high efficiency and low cost.As a kind of induced fraudulent infrared defense equipment,it will produce similar characteristics with the target,which makes the infrared target weapon distinguish between true and false targets difficultly.Therefore,research on the infrared characteristics and infrared images of the infrared decoy interference condition has important significance for anti-interference target recognition.The infrared decoy released by the aircraft will multiply the intensity of the light reflected from the adjacent fuselage skin during the combustion process.The study of infrared characteristics of the reflection,and it provides a new method for target recognition and tracking of infrared precision guidance weapon under the condition of infrared decoy interference.Mainly according to the structural characteristics of infrared decoy and the radiation characteristics of combustion,this thesis has analyzed and established the corresponding mathematic model,and synthesed infrared images after dynamic simulation based on the model of fuselage skin light reflection during the combustion of infrared decoy bomb.The main research contents of this thesis are as follows:(1)According to the geometric structure,movement law and basic working principle of infrared decoy bomb,analyzed its physical and aerodynamic characteristics and influencing factors of performance index,and established aerodynamic mathematical model of infrared decoy bomb.Analyzed the reagent composition,combustion characteristics and combustion mechanism of decoy bomb,accomplished the calculation and simulation of the infrared radiation characteristics of decoy bomb.(2)By analyzing several common lighting models in computer graphics,established the BRDF light reflection model of the decoy bomb on the aircraft skin,and accomplished the simulation of this model by Unity 3D,created three-dimensional dynamic scene of infrared decoy bomb light.(3)Based on the SolidWorks modeling software,established a simplified 3D model of the aircraft,and meshed it with ICEM-CFD,completed calculation and simulation of the temperature field characteristics used Fluent software to set the required boundary conditions.(4)Based on Unity3 D,performed dynamic simulation for the process of dropping the decoy bomb by aircraft,and converted the infrared decoy delivery process into dynamic video frame images in the infrared scene.According to the infrared imaging principle and the crosstalk effect existing in the detector,processed the infrared simulation images that are similar to reality,and compared those with the real infrared images.Through the above theoretical calculations and simulations,this thesis has realized simulation of the F22 infrared sequence images under the conditions of infrared decoy interference preliminarily.The infrared images through simulation and synthesis have features that are easily discernible,and are more consistent with the real infrared video,which provides a good foundation for target recognition in the next step.