地基反射面天线测温系统开发及温度场分析

发布时间：2018-05-29 04:15

本文选题：地基反射面天线 + 温度场　；参考：《西安电子科技大学》2014年硕士论文

【摘要】：随着科学技术的快速发展,大口径地基反射面天线在航空航天和现代通讯等领域使用越来越广泛,随着对天线的性能要求越来越高,其口径也随之越来越大,太阳辐射温度场产生的热变形对天线电性能的影响也与日俱增。故而,对地基天线结构温度分布的研究在工程中是很有价值的。由于太阳辐射温度场是非常复杂的,而且影响因素众多,所以要用实验、仿真及其相结合的方法进行大量的研究。本文便是针对实验天线及实际工程中的天线,搭建温度及环境风速风向测量平台,再结合仿真计算,对测试系统的搭建过程及天线结构温度场进行研究。首先针对某7.3m实验天线,搭建一套能够实时监测天线结构温度的测试系统,并着重对传感器的选择和传感器接线方法以及这套测试系统测量过程中产生误差的原因和对这些误差的修正补偿方法进行研究,提出改进意见和测量误差的修正算法,然后用该测试系统对该天线进行长时间不间断的监测,在一年多的测量数据中找出极端高温、极端低温和最大温度梯度这三种极端工况,并对极端工况的预测方法提出改进意见。其次推广在7.3m实验天线上搭建的测试平台,将其运用到实际工程中,在某35m天线上搭建测试平台,并建立该天线的模型,确定仿真边界条件,对该天线进行多个工况下的仿真与实验分析,根据分析结果进一步分析产生误差的原因。最后借助单片机及Lab VIEW、SQL SERVER等软件工具,开发一套能够实时测量天线所在环境风速风向的测量系统,然后通过长时间不间断的测量,寻求该地区风的规律,并对风速对天线结构温度梯度的影响进行初步研究。
[Abstract]:With the rapid development of science and technology, large-caliber ground-based reflector antenna is more and more widely used in the fields of aerospace and modern communication. The influence of thermal deformation caused by solar radiation temperature field on the electrical properties of antenna is also increasing. Therefore, it is very valuable to study the temperature distribution of the ground antenna structure. Because the temperature field of solar radiation is very complicated and there are many factors affecting it, a lot of research should be done by means of experiment, simulation and its combination. In this paper, the temperature and wind velocity and wind direction measurement platform is built for the experimental antenna and the antenna in the actual engineering. Then, the process of the test system and the temperature field of the antenna structure are studied in combination with the simulation calculation. For a 7.3m experimental antenna, a testing system is built to monitor the temperature of antenna structure in real time. In addition, the selection of sensors, the connection method of sensors, the causes of errors in the measurement process of the test system and the correction and compensation methods of these errors are emphatically studied, and the improved opinions and correction algorithms of measurement errors are put forward. Then the antenna is monitored continuously for a long time by using the test system, and three extreme conditions, namely, extreme high temperature, extreme low temperature and maximum temperature gradient, are found in the measurement data for more than a year. Some suggestions for improving the forecasting method of extreme working conditions are put forward. Secondly, the test platform built on the 7.3m experimental antenna is extended, and applied to the practical engineering, the test platform is built on a 35m antenna, and the model of the antenna is established, and the simulation boundary condition is determined. Simulation and experimental analysis of the antenna are carried out under several operating conditions, and the causes of the errors are further analyzed according to the analysis results. Finally, with the help of single chip computer and Lab VIEWN SQL SERVER, a real-time measuring system is developed to measure the wind speed and direction in the environment where the antenna is located, and then the rule of wind in this area can be found by continuous measurement for a long time. The effect of wind speed on the temperature gradient of antenna structure is studied.
【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN823.27

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