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中文摘要：
针对赋形卡氏天线主面变形导致电性能变差的情况,提出了一种通过实时调整副面位置对其进行补偿的方法。根据最小二乘法对赋形主面的母线离散数据进行分段抛物线拟合,用得到的一组标准抛物环面对变形后的主面进行最佳吻合,同时限定各抛物环面满足同焦轴约束。通过优化计算得出主面吻合参数,再根据主副面的匹配关系,计算副面的空间位置调整参数。将各工况下的副面调整参数存入数据库,实时调用以补偿主面变形。对某64m天线进行了案例验证,得到了满意的结果。
英文摘要：
On the degradation of electrical performance of large shaped Cassegrain antennas by the main reflector deformation,a method for compensation by the moving subreflector is presented.A group of best-fit paraboloids are found by least-square fitting the theoretical discrete data.The group of paraboloids are used to fit the deformed main reflector,with the constraint of all these focuses being in line.The best-fit parameters are optimized and the adjustments of subreflector are derived with the ratio of main reflector and subreflector.The adjustments at various attitudes are saved in a look-up table to real-time compensate for main reflector deformation. From the experimental verification on a 64 m reflector antenna,satisfactory results are obtained.
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