中文摘要：

针对反射面天线多工况及太阳位置时变而导致温度场无规律分布问题,根据反射面天线轴对称的特性,将温度场描述为太阳光线与口径面夹角的函数,提出一种实时预估天线温度场的方法。建立天线热分析模型,在垂直口径面的某个平面内,计算太阳光线与口径面不同夹角时天线温度分布规律并建立温度数据表;根据当前工况查表获得相应温度分布并对其进行旋转变换,由实测数据对其进行修正,从而获得当前时刻天线温度场的估计值。以某7.3 m口径Ka波段轴对称反射面天线为工程案例,对仿真温度和实测温度分别进行预估,预估温度与仿真、实测温度均吻合较好。结果表明该方法简单、快速、有效,可用于轴对称反射面天线热变形的实时补偿,对天线结构设计亦有一定参考价值。

英文摘要：

For the irregular temperature field caused by the multiple conditions of reflector antenna and the change of solar directon, temperature field can be described as a function of the angle between sunlight and aperture plane, based on which, a method of estimating temperature field in real-time is presented. A thermal analysis model is founded and a temperature data sheet is built by calculating the temperature fields under different angles between sunlight and antenna aperture plane. According to current working condition, corresponding temperature field can be obtained by looking-up the temperature data sheet, performing rotation, and being corrected by the measuring temperature values. For this engineering problem, one 7.3 m reflector antenna operated in Ka band is considered as a research object, and the simulation temperature and the measuring temperature are estimated both with good agreement with the estimated temperatures. The analysis results show that the proposed method is simple, fast and effective, and can be used for the real-time compensation for the thermal distortion. There is also reference value for the antenna structure design.