摘要
以FY-3卫星微波成像仪天线为模型,对反射面天线面形精度对天线主波束效率的影响进行了分析。提出基于数值拟合法的公式,用GRASP软件半物理仿真结果,修正Ruze公式关于面形精度影响因子的表达式,实现了工程中天线主波束效率快速估算。该方法减小了Ruze公式中由于假设口径场等幅同相分布引起的计算误差,采用该方法后计算精度可控制在1%以内。最后针对多馈源共用反射面的辐射计天线提出了分区域分析面形精度的方法。
The beam efficiency deterioration,which comes from parabolic antenna surface error,is studied in this paper for FY-3 space-borne radiometer antenna model.A novel numerical fitting method is proposed to revise the impact factor of Ruze-equation(RE)based on the simulation results from GRASP,where calculation error due to the uniform-excitation assumption in RE is alleviated.The antenna test results confirm that the RE beam-efficiency estimation accuracy of better than 1%is realized by employing the revised impact factor.In the last part,a new method called zone partitioning surface error analysis is also proposed for multi-feed reflector antenna.
作者
苏晟
钱巧元
吕利清
王盛
SU Sheng;QIAN Qiaoyuan;LYU Liqing;WANG Sheng(Shanghai Aerospace Electronic Technology Institute,Shanghai 201109,China;Shanghai Satellite Engineering Institute,Shanghai 201109,China)
出处
《上海航天》
CSCD
2018年第2期121-125,共5页
Aerospace Shanghai
关键词
物理光学
反射面天线
面形精度
主波束效率
微波辐射计
Ruze公式
半物理仿真
数值拟合
physical optics
reflector antenna
surface error
beam efficiency
microwave radiometer
Ruze-equation
hardware-in-the-loop simulation
numerical fitting
