Research On High-precision Optical Tracking For Precise Beam Pointing

High-precision optical tracking is a method that uses optical imaging to achieve high-precision capture,aiming,and tracking of targets.This dissertation conducts detailed research and analysis on the status on application fields,system design and control algorithms of optical follow-up systems.In order to meet the development needs of the fine-and-coarse tracking and tracking process in the current optical tracking,this dissertation studies the high-precision optical tracking for accurate beam pointing,and mainly studies the following contents: Completed the research of high-precision optical tracking theory and the design of the overall experimental system scheme.The research of high-precision optical tracking control algorithm is completed,including the research on the PID control theory and the optical follow-up algorithm control flow in the optical tracking algorithm.Completed experimental research on high-precision optical tracking method,including high-precision optical tracking coarse-and-fine tracking unit verification experiment,high-precision optical tracking integral experiment,and functional verification experiment for accurate beam pointing.The accuracy study of high-precision optical tracking was completed,including the influence of image localization algorithm on the accuracy of tracking,Analysis of tracking precision of coarse tracking experiment and fine tracking experiment,Finally,the piezoelectric galvanometer is analyzed for error and the beam jitter offset angle is analyzed.Based on the above research,this dissertation has achieved some results.In the aspect of theory and system design,the whole structure of the whole tracking system and the working principle of rough-and-fine tracking are analyzed.According to the principle,the overall experimental optical path of the optical tracking method including the active light source is designed.In the aspect of control algorithm,the control algorithm of coarse-and-fine tracking two-level tracking system is studied.Based on the Labview program,a control algorithm including a coarse tracking control unit,a fine tracking control unit and a threshold determination unit is written.In the experimental aspect,the coarse and fine tracking unit experiment was carried out.The results show that the tracking effect can be achieved when the two parts are operated separately,and the mapping relationship between the PID set value and the output quantity is measured in the fine tracking experiment.Secondly,the overall experiment is carried out,the results show that the experimental optical path and control algorithm we designed can meet the requirements of the indoor tracking verification experiment test.Finally,the feasibility of using the active light source to accurately direct the beam to the target is verified in the experimental optical path.In the aspect of precision analysis,the error analysis of two centroid algorithms by the gray centroid method and the neighborhood curve fitting method shows that the gray scale centroid algorithm is more stable in the indoor tracking experiment.Based on the coarse-and-fine tracking experiment,the tracking precision of two parts is explored.The results show that in the rough tracking process,the tracking precision is in the order of milligram.In the fine tracking process,the tracking accuracy reaches the micro-arc level,that is,the overall tracking accuracy meets the requirements of the tracking accuracy of the indoor follow-up verification experiment.Finally,the calibration analysis of piezoelectric vibrator is done,and the arrival Angle of beam is determined to be 2-3 ?rad.The results of this dissertation show that the tracking and pointing method designed by us can achieve the tracking and pointing effect,and has significant advantages in precision and active laser application.