桁架式可展开天线精度计算方法  

Error computation method of deployable truss antenna

作　　者：侯国勇[1] 关富玲[1] 赵孟良[1] 

机构地区：[1]浙江大学空间结构研究中心,浙江杭州310058

出　　处：《浙江大学学报（工学版）》2008年第9期1469-1473,共5页Journal of Zhejiang University：Engineering Science

基　　金：国家自然科学基金资助项目(69982009)

摘　　要：为了建立单元尺寸与反射面精度的关系模型来指导天线结构设计,分别用单元上取点、应用于球体及抛物面的浅壳理论推导了3种不同的误差计算方法,并进行了对比.用基于PhotoModeler软件建立的非接触摄像测量系统,对口径为2 m的天线模型进行了反射面精度测试及展开重复精度试验,将试验结果与误差的理论计算方法进行对比,验证了应用于抛物面的浅壳理论推得的公式估算反射面精度更精确,应用于球体的浅壳理论推得的公式使用方便,计算结果与应用于抛物面的线壳理论公式所得结果较接近,单元上取点推得的精度计算公式可以用来估算拟合抛物面的拟合焦距,指导天线调焦机构的设计.In order to establish the mathematical formulas for element size and surface error to guide the antenna design, three methods were presented to calculate the reflector surface error, which were obtained by getting points on element, using shallow theory on paraboloid and sphere, and their results were compared. A non-contact Photogrammetric measure system was built using PhotoModeler software packages to measure the static surface error and the repeated deploying surface error of an antenna model with 2 m caliber. Finally the comparison of the test results with the theoretical solutions shows that the formula deducted from shallow theory used on paraboloid has higher accuracy, but the formula deducted from shallow theory used on sphere is simple and its result is close to the former formula. The formula deducted from getting points on element can obtain the focus and guide the design of focus adjustment system for antenna.

关 键 词：可展开天线 形面偏差 精度测试 

分 类 号：V414[航空宇航科学与技术—航空宇航推进理论与工程]