Research On The Realization Technology Of Infield Trajectory Based On A New Tri-axial Optical Target

The precision testing equipment of photoelectric theodolite is the special testing equipment developed with photoelectric theodolite,which has a relatively single application field and usually be supported technically by the production and development of photoelectric theodolite.On the other hand,this equipment also has formed its own development system.Only the corresponding index performance is higher than the testing items of photoelectric theodolite,can it reflect the true level of photoelectric theodolite.At the same time,with the development of photoelectric theodolites in recent years,higher requirements have been put forward for their detection equipment.The lag in the development of detection equipment will directly limit the development of photoelectric theodolites.As a newly developed detection equipment for photoelectric theodolite,a new tri-axial optical target which can provide complex and changeable motion trajectories of simulated targets and conform to the laws of actual air target motion better,plays an obvious advantage in term of simulating physical trajectories infield.Basing on angular motion characteristics of the target in the spherical coordinate space,in-depth research is mainly carried out from two aspects,which includes the use of the tri-axial optical target to achieve the physical trajectory of the target in the infield environment,as well as the vibration and stability analysis of the target’s light emitted during the trajectory movement.The research focus of the thesis is mainly described as follows:Based on the tri-axial optical target,this article introduces its detection principle from functions,indicators and the structure composition.Then the error source which affects the accuracy of the shaft system is expounded,and the effect of the shaft system error on the static pointing accuracy of the light emitted by the simulated target is analyzed.With photoelectric theodolite as the observation point,the horizontal uniform circular trajectory is used as the typical trajectory to analyze the angle peak characteristics about the peak angular velocity and the peak angular acceleration.Then the trajectory is converted and the angle motion characteristics of various trajectories is determined such as the constant velocity circular trajectory of the inclined plane,the rotation trajectory of the traditional target,the straight and flat flight trajectory,and the climb and dive trajectory.Combining the indicators and characteristics of the tri-axial optical target,the relationship between the simulated target and the actual air target is discussed,and the inequality relationship between the target angular motion peak values at any trajectory is proposed.The angular motion mobility of the horizontal uniform circular trajectory is analyzed and expanded,and the angular motion vacuum zone theory is proposed.Two forms of angular motion sinusoidal trajectory are designed and adopted to realize the physical simulation of the internal field trajectory of the tri-axial optical target,which improve the adaptability of the peak angular acceleration to the peak angular velocity,accommodate the mobility conditions in detecting photoelectric theodolite and increase the accuracy of the tracking performance evaluation of photoelectric theodolite.Aiming at the motion process of the tri-axial optical target trajectory simulation,the stability of the trajectory realization and the vibration of the tri-axial optical target structure are considered.Kinematics and dynamics analysis are performed on the three-axis linkage system as a rigid body,the driving torque or driving force of each axis system,and the coupling effect between axes are determined to complete the trajectory movement.Considering the structural stiffness of the cantilever beam,a dynamic model of the rigid body-elastic beam coupling system is established,and the deformation of the elastic cantilever beam along the y-axis and z-axis are analyzed,as well as flexible beam vibration caused by moving variable load.Then the influence of structural vibration and system instability on the angular positioning and pointing accuracy of the light emitted by the target generator are determined.Based on the analysis of the above-mentioned trajectory simulation and trajectory realization technology,the tracking experiment is carried out practically by photoelectric turntable to realize the internal physical simulation of the trajectory tracking and the tri-axial optical target is utilized to generate the sine angular trajectory of the simulated target.Then the stability test experiment of the tri-axial optical target is conducted by using the staring method.Through different combination tests of single motion,pairwise linkage and three-axis linkage,the influences of different forms of movement on the measurement accuracy and the coupling in three-axis linkage system are analyzed.