Research On Time Measurement Accuracy Of Photoelectric Detection System

In the research of directional infrared countermeasure system(DIRCM),jamming effect evaluation is very important.It objectively and accurately evaluates the jamming effect of jamming equipment against infrared guidance system to strengthen the development of photoelectric system and optimize the design of key parameters.Therefore,how to reliably evaluate the jamming effect of the system has always been a research topic of great concern.This paper aims to study a photoelectric detection system to measure various reaction time parameters in the DIRCM interference process as an important basis for evaluation.Firstly,based on the working principle of photoelectric detection system,related technology in hardware circuit is studied and designed to ensure the realization of system functions,including: time identification circuit,detector signal amplification circuit and system time measurement technology.At the same time,in order to improve the time measurement accuracy of the system,the errors of each link are analyzed,including transmission cable delay error,shutter opening delay error,system time measurement error and detector response delay error.By means of formula calculation,experimental testing,time sequence analysis and algorithm processing,the size of each error value is determined to provide data support for data compensation.In terms of the algorithm,a mathematical model is built according to the response mechanism of the detector,and the response error problem of the detector is analyzed.A fusion algorithm is applied according to the calculation principle of the existing genetic algorithm and particle swarm optimization algorithm,and the problem is solved respectively.According to the results of several measurements,the algorithm is evaluated comprehensively from the aspects of algorithm fitting effect,algorithm optimal value,algorithm computing speed and algorithm time complexity,and the high efficiency of the algorithm is verified.Finally,the delay time of the detector is calculated by using this algorithm and the time size is determined.In terms of system platform construction,the opto-mechatronics design is adopted,which can evaluate the interference effect of DIRCM and provide data support for theoretical research.Among them,the simulation target system can simulate the target characteristics.By adjusting the mechanical structure,it can not only dock with the optical axis of the DIRCM system,but also achieve multi-directional testing.The control system can supply power to the simulated target system and control its opening and closing.Meanwhile,the response signal of the DIRCM system is captured and the time is measured.In the aspect of data processing,it analyzes the gross error,systematic error and random error.A method is designed to eliminate the gross error,which can quickly judge the reliability of the current measured value according to the historical measured value,and improve the testing efficiency.According to the calculation results of the error value of each link,the system error compensation is carried out,and on this basis,the correction function is used to modify the data,so that the result is closer to the real value.Reduce the influence of random error by multiple measurements.Finally,the experimental verification method is designed for each time term,and the rationality and reliability of the data processing method are verified from the error value,linearity and stability.