Research On Radiation Measurement Technology Of Infrared Target Simulator

As an important part of infrared semi-physical simulation system,infrared target simulator is an important tool to test the target identification and anti-jamming capability of infrared guided weapon.The simulation of missile-target distance and approach speed are realized by the irradiance change of infrared target simulator,by which the precision and stability will affect simulation test result,and directly related to the performance evaluation of missile system.Therefore,it is necessary to measure and calibrate the radiation of target simulator regularly.The purpose of this subject is the research of measurement method,calibration and data processing method of measurement device for radiation measurement technology of infrared target simulator,which has important significance of military strategy for the promoting of China's national defense science and technology.Aiming at the problems of unably evaluate of part simulation performance for large military infrared target simulator,to seek a kind of infrared target simulator radiation measurement method is the key problem of the research of this paper,by which effective performance evaluation under all simulation conditions can be realized.Aiming at the adverse effect caused by calibration voltage change resulting from abnormal radiation fluctuation of calibration source for infrared target simulator radiation measurement,to establish a calibration parameter model with strong anti-interference ability is an importment issue of this dissertation.Aiming at the adverse effect for infrared target simulator radiation measurement caused by data processing error resulting from nonlinearity of calibration data,to study a data processing method with good fitting performance is another important issue of this dissertation.Aiming at the above problems,the research of infrared target simulator radiation measurement technology has carried out in this paper.The main research contents are as follows:(1)Aiming at the problems of unably evaluate of simulation performance for large military infrared target simulator when the field stop changes,a kind of infrared target simulator radiation measurement method with detector underfilled measurement mode is proposed.First,aiming at measurement function limited problem of traditional measurement method with detector overfilled measurement mode,the measurement method with detector underfilled measurement mode is proposed,correspondingly,the radiation measurement system based on detector response characteristics of imaging and incident light intensity change is built.Secondly,according to the established quantity-value transfer model,the response voltage deviation problem when imaging state in calibration and measurement is different is theoretically studied,and its effect on radiation measurement is experimentally studied.Thirdly,in order to avoid measurement error caused by above problems,the measurement premise based on imaging consistency in calibration and measurement is proposed.Finally,the background radiation model considering stray radiation of calibration source is studied,aiming at background radiation differences problem in calibration and measurement,the improved background radiation voltage correction process is proposed.(2)Aiming at the adverse effect for infrared target simulator radiation measurement caused by calibration voltage change resulting from abnormal radiation fluctuation of calibration source,a calibration method based on calibration parameter model of equivalent blackbody temperature(EBTB)is established.First,in view of the deficiency of traditional model in anti-interference ability and measurement efficiency,the equivalent blackbody temperature is derived as the new calibration parameter,and the calibration parameter model of EBTB was established.Secondly,in view of the problem that existing calibration process cannot meet the calibration requirements of new measurement mode,the field of aperture changes in combination with blackbody temperature of calibration source,by which the calibration range from 6×10-10W/cm2 to 7×10-4W/cm2 is achieved.Finally,the reasons for different anti-interference ability of different models are studied,and the comparison experiment of anti-interference ability of different models is carried out.The experiment results have shown that,under the influence of 1% calibration voltage change,the absolute value of measurement deviation of EBTB model is less than 4%,the measurement error can be reduced by 15%-64% compared with traditional methods in different comparison conditions,and the effect is more obvious when measured radiation or voltage is low.(3)Aiming at the adverse effect for infrared target simulator radiation measurement caused by data processing error resulting from nonlinearity of calibration data,a data processing method based on particle swarm optimization-adaptive processing support vector regression(PSO-ASVR)algorithm is proposed.In order to overcome the deficiency of traditional methods in fitting performance,The data processing flow based on PSO-ASVR algorithm is constructed.Adaptive processing(AP)process is built for calibration data pretreatment,support vector regression(SVR)algorithm is adopted to calibration data fitting,and the parameters optimization of SVR algorithm is achieved through particle swarm algorithm(PSO)algorithm.The fitting performance comparison experiments of different data processing methods are carried out.The experimental results have shown that,compared with LS method,the fitting error can be reduced by 86% with ALS method using AP process;Compared with traditional methods,the fitting error can be reduced by 40% with PSO-ASVR method.(4)The radiation measurement experiment of large military infrared target simulator is carried out,and the uncertainty of measurement result is analyzed.Firstly,infrared target simulator radiation measurement system based on detector response characteristics of imaging-incident light intensity change is developed,aiming at the problem of measuring range limitation for existing device,high detection rate and multiple energy attenuation plan are put forward,by which the radiation measurement from 6×10-10W/cm2 to 7×10-4W/cm2 when S/N=100 is realized.Secondly,the radiation measurement experiments for collimating radiation source are carried out,the experimental results have shown that,the measurement deviations are better than 0.8% and 1.7% for calibration points and non-calibration point.Thirdly,the radiation measurement experiments of infrared target simulator are carried out,the experimental results have shown that,the system can meet measurement requirements in all simulation state of large military infrared target simulator,the measurement deviations of equivalent blackbody temperature are better than 2.5? compared with thermal infrared imager.Finally,the uncertainty analysis of radiation measurement results are carried out,the relative expanded uncertainty is 2.8%(k=2).