Optimization Design Of Optical Primary And Secondary Mirror Support Structure Of Laster Communication Large Dimeter Ground Station

With the rapid development of laser communication technology,laser communication,large diameter ground station as the satellite-ground of the laser communication terminal,main effect is to establish communication with the satellite link,realize mutual transmission of data between satellite and ground station.The satellite-ground laser communication has the characteristics of complex communication distance,transmission channel,in order to establish a stable and reliable the satellite-ground laser communication link,achieve the the satelliteground laser communication,therefore,it is necessary to design of large diameter ground station data terminals and optimization.This article main the optical primary and secondary support as the research object of satellite-ground laser communication large-diameter vehicle-mounted mobile earth station in through the finite element simulation analysis and experimental testing,finished primary and secondary mirror supporting structure optimization design.First,make sure the primary and secondary mirror form evaluation method and form fitting method,comparative analysis of the primary and secondary mirror supporting structure,based on the advantages and disadvantages of the structure,determined the primary and secondary mirror general support scheme,the primary mirror axial the mechanical Whiffletree,with mercury belt and core shaft radial support structure composite support structure,secondary mirror using A lever type support structure.Secondly,it optimizes the position of supporting points and supporting points by means of finite element analysis for the axial support of the main mirror.The structure optimization design of support triangle and support base is carried out.The ratio and support position of the radial support mercury in the main mirror are optimized and analyzed.On primary mirror work in 0~90° different perspective,the main lens shape precision are analyzed in the simulation,and the primary mirror under the support structure was hot deformation simulation analysis.Again,in view of the secondary mirror support through finite element analysis to audition to type A four bar and type A three pole support from the natural frequency of structure,the rigid body displacement and torsional Angle of lens has carried on the contrast analysis,finally determined the audition to type A four bar type support;Using topological optimization method,the weight of the submirror components is reduced by the lightweight design of the support bar.In this paper,the secondary mirror adjusting mechanism is designed and the thermal deformation and dynamic simulation analysis are carried out.Finally,the simulation analysis and dynamic simulation analysis of the main secondary mirror support structure are carried out.The surface precision of the main mirror and the wave aberration of the system were detected by the ZYGO interferometer,and the test results verified the correctness of the simulation analysis.