Study On The Accurate Calibration Techniques Of Plane Equation Of Sky Screens Array

In the weapons range test,the sky screens optical target is the only automatic testing device at home now,which can measure the intensity of the continuous occurrence of the high rate of fire projectiles,and plays an important role in accurately evaluating the combat effectiveness of the weapon system.The measurement accuracy of the device is closely related to the calibration accuracy of plane equation of sky screens array.Accurately calibrating the plane equation of sky screens array is a powerful guarantee for the accuracy and reliability of the data measured by the sky screens optical target.It is one of the indispensable key parts of measuring instruments before go out of the factory.In this paper,the accurate calibration technology of plane equation of sky screens array is studied.The main contents are as follows:Firstly,the development status of sky screens array and related calibration methods at home and abroad are studied,and the advantages and disadvantages of common calibration methods are summarized.The characteristics of the sky screens array are analyzed,and verified by experiments.The key factors that influences the accuracy of measurement of sky screens optical target in actual project are discussed in this paper.Then,the shortcomings of the traditional method that uses double theodolites calibrate the plane equation of the sky screens array are analyzed.Secondly,the optimization program of accurately calibrating the plane equation of sky screens array by double theodolites is proposed.The LED surface light source is designed as light source of the sky screens optical target to avoid the phenomenon of the sky screen off-axis.The simulation and optimization of the measurement layout of double theodolites and the best position and attitude of benchmark are studied,which achieve the best layout station of double theodolites.The technology of thickness center recognition of sky screen are studied,which designs a special sky screen receiver with the functions of translation,rotation,lifting,fine adjustment and image capture and processing,and improved the accuracy of finding and identifying the thickness of sky screen center.Thirdly,the principle experiment platform for the plane equation calibration of the sky screens array are set,and the feasibility of the camera to accurately identify the sky screen center algorithm are verified,and the calibration and drawing of plane equation of the sky screens array are completed.The feasibility and rationality of this scheme are verified through live fire experiments.Compared with the traditional double theodolites calibration method,the coordinate accuracy of the optimized calibration method can be increased by up to 10.6%.Finally,the method of numerical evaluation is used to evaluate the uncertainty of the measurement of plane equation calibration of the sky screens array.In the space of 10m×7m×4m,the expansion uncertainty of plane equation of sky screens was 2.6996 mm.The calibration result was completed.