天线反射面和馈源位置误差对电性能的影响规律研究

Research on the influence of antenna reflector andfeed position errors on electrical performance

提出的基于Zernike多项式描述的反射面误差模型,用以分析反射面和馈源位置误差对电性能的影响规律。利用该模型,以标准卡塞格伦13 m口径天线为研究对象进行建模仿真。研究了反射面位置误差分布、馈源相位中心误差和馈源角度误差对远场方向图的影响规律,结果表明主面X偏移、RY偏移、馈源X偏移,导致了方向图整体偏移,副瓣电平不同程度抬高。主面Y偏移、Z偏移、馈源角度偏移,仅导致副瓣电平不同程度抬高。主面RX偏移对方向图基本无影响,增益损失对Z偏移较为敏感,相同偏移量时,Z偏移对增益损失为X、Y偏移的8倍。

In this paper,a reflector error model based on Zernike polynomial description is proposed to analyze the influence of reflector and feed position error on electrical performance.Using this model,a standard Cassegrain 13 m aperture antenna is utilized as the subject of study for modeling and simulation.The influence of reflector position error distribution,feed phase center error,and feed angle error on the far-field pattern are calculated.The results show that the X offset,RY offset of main-reflector,and X offset of feed have led to overall pattern offset,with varying degrees of sidelobe level degradation.The Y offset,Z offset of main-reflector,and angle offset of feed have only led to varying degrees of sidelobe level degradation.The RX offset of main-reflector has little effect on far-field pattern,and gain loss is more sensitive to Z offset of main-reflector.When the offset is the same,the gain loss caused by Z offset is 8 times that of X and Y offset.