Research On Infrared Characteristics And Detection Technology Of Stealth Aircraft

At present,the stealth of stealth aircraft in developed countries is getting better and better,which poses a great military threat to China,and stealth aircraft detection methods need to be further improved and enhanced.It is very important to study the infrared characteristics of stealth aircraft and infrared target detection technology.This article has carried on the digital simulation research to the stealth aircraft's infrared characteristic and the detection technology.First,using the data provided by the HITEMP spectrum database for theoretical extrapolation to obtain more accurate parameters,the flow field modeling simulation of the main radiation tail flame part of the stealth aircraft was completed,and the infrared short and medium wave tail flame radiation calculations were improved,and the calculation method of long-wave tail flame radiation is proposed.Then,the atmospheric environment and atmospheric infrared characteristics are discussed,and the simulation software is used to calculate the atmospheric transmittance in the range of 1 ? 20?m,and the detection distances in the short,medium and long bands are calculated.The parameters of the detection system were also reasonably designed according to the engineering requirement that the altitude of the detector is ×× ? × × km and the target flying height is 10 km.Finally,this article uses Unity3 D to construct a three-dimensional flight scene in the infrared view of the stealth aircraft,and records the infrared simulation data set of the stealth aircraft.The improved YOLOv3 is used to detect the stealth aircraft.The main work of this article can be divided into the following parts:1.Calculation of multi-band tail flame radiation.First,starting from the standard state data in the HITEMP database,the theoretical extrapolation method is used to calculate the band model parameters with higher accuracy and a wider wavelength and temperature range.Then,focus on the infrared radiation of the tail flame,geometric modeling and simulation of the tail flame flow field to obtain the relevant parameters of the tail flame flow field.Finally,the Curtis-Godson(C-G)approximation method is used to calculate the multi-band zero-line-of-sight infrared radiation.2.The detection distance and parameter design of the detection system.Considering the influence of the atmosphere on the radiation transmission,the atmospheric composition and atmospheric environment are introduced,the atmospheric stratification phenomenon and general laws are summarized,the atmospheric absorption mechanism of infrared radiation is introduced,and the atmospheric transmittance is calculated by calling PcModWin3.7 software.Starting from the general formula of detection distance,the average atmospheric transmittance in the formula is corrected,and the multi-band detection distance is calculated.According to the general formula inverse solution,reasonable values of important parameters of the detection system are obtained,and the false alarm probability and detection probability are briefly introduced.3.Infrared data set simulation and infrared target detection.Using Unity3 D,a 3D flight scene of a stealth aircraft in infrared view was established,and a simulation data set for target detection was collected through video recording.Use YOLOv3 algorithm for training and improvement to detect stealth aircraft targets.In summary,in this paper,in terms of the infrared radiation characteristics of the tail flame,the parameters of the band model are calculated in detail,the flow field of the tail flame is simulated,and the radiation intensity of the tail flame is comprehensively calculated.In terms of the research of detection system,the calculation of the influence of atmospheric transmittance on radiation transmission is emphasized,and the detectable distance of the system is calculated and analyzed.The system parameters are reasonably analyzed and designed.In terms of stealth aircraft detection,an infrared data set has been produced,and the YOLOv3 algorithm has been used to detect stealth aircraft infrared targets,and the algorithm has been analyzed and improved.This paper has sufficient workload,has some innovations,and has achieved the expected goal.