Dynamic Test Calibration And Compensation In Light Screen Array Measurement System

In the weapons range test,light screen array test system(LSA for short)plays a very important role.In order to further improve the measurement accuracy of the LSA,it is necessary to calibrate this system effectively.Generally,the traditional calibration of the LSA mainly focuses on its key structural parameters.However this thesis focuses on the calibration of its time-domain signal based on the theory of a dynamic test.The main researches are as follows:The generation process of the signal in the LSA and the necessity of its calibration are analyzed,respectively.The development of the LSA and its related dynamic test at home and abroad are investigated.Besides,some advantages and disadvantages of the current calibration methods of the LSA are summarized.Next,the physical process that a projectile passed through light screens is analyzed.Accordingly,due to the inconsistency of the measurement channels,this brings about a problem that the time of the triggering point at the signal of the LSA is delayed.Unfortunately,this has some serious influence on the measurement results of the LSA.Some characteristics of light screen sensor and its signal are studied,respectively.Next,a calibration method is developed.Through analysis of characteristics of the signal in the time and frequency domain,it is found that the most important factor is the low-pass filter,and it leads to the distortion of the signal.Further,the dynamic characteristics of the sensor are analyzed,and its deterioration reasons are also probed.Based on actual circuit,the first-order and second-order low-pass filters are analyzed,and the advantages and disadvantages of the existing extraction algorithms for the feature time parameters are discussed.A scheme using the calibration principle with pulse is designed,and a simulation experiment platform is built to ensure the same transfer function among the light screens through calibration with the appropriate calibration signal.Finally,simulation shows the proposed method is feasible.To obtain the original change curve of luminous flux,the light-screens sensor is compensated using the inverse system identification principle,and this is performed based on the particle swarm algorithm;specially,the method is introduced in detail.Through simulation,the result shows the compensation is valid.In this thesis,contributions can improve the measurement accuracy of the feature time parameters in the LSA;in addition,the measurement accuracy of the flight parameter of external ballistics can be improved using the LSA.Most importantly,the application field of the LSA is expanded in shooting range test,and the level of weapon test can be also advanced.