摘要
在同时存在随机误差和系统误差的情况下,提出了反射面天线平均功率方向图的计算方法.首先,分析面板加工误差以及框架安装误差,得出口径场随机相位误差的平均表达式.然后,考虑馈源的轴向偏焦问题,推导出系统误差存在时锥削照射相关函数的解析形式,进而得出了两种不同性质误差共同作用下的平均功率方向图.最后,以某65m口径天线为对象,研究了随机误差和系统误差对其电性能的影响,并给出了参考建议.
The method for evaluating the average power pattern of reflector antennas is proposed when they are subj ected to random errors and systematic errors.Firstly,the average expression for the random phase error of the aperture field is derived by analyzing the manufacturing errors of the single panel and misaligned errors of panel frames.Subsequently,the closed-form expression for the tapered illumination correlation function is derived by incorporating the axial defocus of the feed caused by systematic deformation.Then a novel mathematical model is developed to evaluate the average power pattern efficiently caused by the random error and systematic error.Finally,detailed parametric simulations are performed based on a reflector antenna with a 65 m diameter to investigate the overall effect of the random error and systematic error on the performance,and reference advices are given finally.
出处
《西安电子科技大学学报》
EI
CAS
CSCD
北大核心
2014年第6期188-194,共7页
Journal of Xidian University
基金
国家自然科学基金资助项目(51035006
51205301)
关键词
反射面天线
随机误差
系统误差
相关距离
平均功率方向图
reflector antennas
random errors
systematic errors
correlation interval
average powerpattern
