相位恢复全息法天线面形测量技术研究

发布时间：2018-01-17 22:24

本文关键词：相位恢复全息法天线面形测量技术研究　出处：《新疆大学》2017年硕士论文　论文类型：学位论文

【摘要】：大口径反射面天线是未来深空探测和前沿射电天文观测的关键设备之一,天线的表面精度是影响天线效率和性能的重要因素。表面精度不仅受到面板制造和装配精度的影响,在天线运行过程中也会受到自身重力、温度、风载等准实时性因素的影响。这些因素将直接导致天线增益降低、天线方向图发生变化等问题,因此表面精度成为评价大口径反射面天线性能的重要指标。针对天线表面精度的测量方法,本文做了一系列研究工作。首先,根据国内外在面形检测技术上的发展趋势,研究了基于相位恢复全息法的面形测量方法,在详细推理相位恢复全息测量原理的基础上,分析多种相位恢复算法,并编写了Misell算法仿真程序。然后,建立了Misell算法所需要的远场模型,利用仿真模型生成的远场数据对预置表面形变进行恢复。通过仿真Misell算法,分析算法的恢复精度和误差来源,为实际工程应用配置测量参数提供参考依据。最后,在仿真了Misell相位恢复算法的基础上,研究了基于主动反射面主动变形的相位恢复全息方法。此方法借助主动反射面快速、精准、便捷的特点,通过调整主动面获取远场幅值,即可检测面形误差。文中通过采用高斯函数和泽尼克多项式建立仿真模型,计算任意表面形变的恢复误差,并研究了在多种连续主动面变化下的表面形变恢复效果。结果表明此方法可以稳定精准地检测面板形变,从而有效提高射电望远镜的观测效率。
[Abstract]:Large aperture reflector antenna is one of the key equipment for deep space exploration and frontier radio observations in the future, the surface precision is an important factor affecting the efficiency and performance of the antenna. The surface accuracy is not only affected by the accuracy of the panel manufacturing and assembly, in the antenna operation process will have its own gravity, temperature, wind load effects etc. real time factors. These factors will directly lead to the gain of the antenna is reduced, the problem of antenna pattern changes, so the surface accuracy has become an important index to evaluate the performance of large aperture reflector antenna. The antenna surface precision measurement method, this paper has done a series of research work at home and abroad. Firstly, according to the development trend of surface shape detection technically, the study of shape measurement method based on phase holographic method, basic principle of holographic measurement in the recovery phase of the detailed reasoning, analysis of a variety of phase. The complex algorithm, and the preparation of the Misell algorithm simulation program. Then, Misell algorithm was established to model the far field, far field data generated by the simulation model of preset surface deformation recovery. Through simulation analysis algorithm Misell algorithm, the recovery accuracy and error sources, provides the reference for the application of the configuration measurement parameter of the actual project. Finally, based on the simulation of the Misell phase retrieval algorithm, the method of holographic recovery based on refelector phase active deformation. With this method the active reflector of rapid, accurate, convenient features, access to the far field amplitude by adjusting the active surface, can detect the surface error. By using Gauss function and Zernike polynomials simulation model is established in this paper, error recovery calculation of arbitrary surface deformation, and to study the surface deformation in a variety of continuous active surface changes under the effect. The results show that the recovery The method can detect the deformation of the panel steadily and accurately, thus effectively improving the observation efficiency of the radio telescope.

【学位授予单位】：新疆大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P161

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