基于参数化控制的亚毫米波辐射计天线容差分析

Tolerance analysis of sub-millimeter wave radiometer antenna based on parametric control method

摘要:

基于Matlab参数化控制GRASP9天线仿真模型，通过Matlab程序调用GRASP9仿真界面，批量化计算毫米波、亚毫米波辐射计天线电性能。以FY4系统方案验证样机准光馈电网络椭球镜的安装误差为例，分析椭球镜在球坐标系中的位移和转角偏差对天线电性能影响。当位移和角度偏差分别控制在0.5 mm和0.4°以内，主波束效率可达到指标要求的90%以上。理论计算结果与测试结果吻合良好，验证了参数化控制法对多变量容差分析的有效性，为后续工程装配提供技术基础。

Abstract:

A parametric control method based on Matlab is studied. GRASP9 simulation interface is called by Matlab program, and the antenna electric performances of millimeter and sub-millimeter wave radiometer are batch processed. Taking the installation error of quasi optical feed network in principled sample machine as an example, the main beam efficiency is analyzed by the displacement and angle deviation of ellipsoidal mirror. Under the displacement deviation within 0.5 mm and angular deviation within 0.4°, the main efficiency can meet 90% of the indicators requirements or more. The theoretical calculation results are in good agreement to the test results, which verifies the effectiveness of the parameters control.