真空低温环境抛物面天线的摄影测量网形研究

摘要

In order to improve measurement accuracy of deformation for large parabolic satellite antenna in vacuum and cryogenic environment, photogrammetry form is studied in this paper, which is one of main factors has effect on accuracy.Theory analysis show that surrounding network has an advantage over strip network in improving accuracy of deformation measurement of parabolic antenna.To verify this analysis, contrast test for different network is designed,moving mechanism is set up,and antenna model with diameter of 5 m is measured.Repeatability of shape error and length error are used as evaluation standard in contrast test.Measuring conclusion is consistent with the aboved analysis.%为了提高真空低温环境下卫星大型抛物面型天线变形测量的精度,对摄影测量技术中影响测量精度的主要因素之一测量网形进行了研究.通过理论分析发现,环拍网形比航带网形更有利于提高抛物面型天线变形测量的精度.为了验证该结论,设计了不同网形的对比试验,搭建了针对实现网形拍摄的移动机构,并以形面偏差的稳定性和长度平均偏差大小作为判断标准,对直径5 m的抛物面天线模型进行了测量,测量结果与理论分析一致.