摘要
大型高精度双反射面天线的结构变形严重恶化其电性能,工程中开展天线形面测量与调整工作极为重要。针对目前工程中实现大型天线形面在线调整难的问题,探讨了一种利用激光跟踪仪从天线副面测量主面形面的调整方案。将激光跟踪仪安装在副面的背面,且激光探头可沿着副面背面的边沿导轨移动,则利用激光跟踪仪靶标自动搜索功能,实现从副面测量主面形面而不影响天线正常工作。基于上述测量方案,从最佳拟合反射面的概念出发,推导了双反射面天线副面的位姿调整量和主面的促动器调整量。相比传统方法,该方案能够实现在线自动测量,且因测量系统依附于副面,故无需测量副面的刚体位移即可同时得到主面和副面最佳匹配时各自的调整量。针对某35 m双反射面天线仿真分析了该方案的调整效果,结果表明,仅调整副面时的形面误差范围由±3.5 mm减小到±1 mm,同时调整主副面时的形面误差近似为零,不过在工程应用时还需要考虑测量系统测量精度的影响。该方案可有效改善反射面天线的形面精度和电性能,可为工程中大型高精度双反射面天线形面的闭环调整提供参考。
Objectives:Structural deformation of dual-reflector antenna with large aperture and high surface precision will greatly decrease its electrical performance,and performing surface measurement and adjustment is of great importance.For the problem of online adjustment of structural deformation in engineering,one online adjustment method is presented based on a laser tracker measuring system.Methods:Assumed that a laser tracker is installed on the back frame of sub-reflector and laser probe can move along the guideway on the edge of sub-reflector,with its ability of automatic target search,it will be possible to realize automatic measurement during antenna operation.Based on the above measuring strategy,we derive the pose adjustments of sub-reflector and the panel adjustments of main reflector based on the concept of best-fit reflector using the measured surface information of main reflector.The proposed method can achieve the online measurement,and because the measuring system is fixed on the sub-reflector,there is no need to measure the position and attitude of the sub-reflector again.Results:For a 35 m reflector antenna,the adjustment precision is discussed,and simulation results show that the surface error is reduced to±1 mm from±3.5 mm when only the sub-reflector is adjusted and the surface error is nearly zero when the sub-reflector and main reflector are both adjusted.It should be noted that the measurement accuracy of the whole measuring system should be further considered in engineering.Conclusions:The proposed method can greatly improve reflector’s surface accuracy and electromagnetic performance,and it can provide helpful guidance for automation closed-loop surface adjustment of large dual-reflector antenna.
作者
许谦
连培园
XU Qian;LIAN Peiyuan(Xinjiang Astronomical Observation,Chinese Academy of Sciences,Urumqi 830011,China;Key Laboratory of Radio Astronomy,Chinese Academy of Sciences,Urumqi 830011,China;School of Electromechanical Engineering,Xidian University,Xi'an 710071,China)
出处
《武汉大学学报（信息科学版）》
EI
CAS
CSCD
北大核心
2022年第3期396-404,共9页
Geomatics and Information Science of Wuhan University
基金
新疆维吾尔自治区天山雪松计划(2020XS12)
国家自然科学基金(51805399)
国家重点研发计划(2021YFC2203601)
中国科学院青年创新促进会(Y202019)
中国科学院天文台站设备更新及重大仪器设备运行专项经费。
关键词
反射面天线
变形检测
形面调整
远场方向图
激光跟踪仪
reflector antenna
deformation measurement
surface adjustment
far field pattern
laser tracker
