| 辐射计反射面天线面形精度对其主波束效率影响研究 |
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| 引用本文： | 苏晟,钱巧元,吕利清,王盛.辐射计反射面天线面形精度对其主波束效率影响研究[J].上海航天,2018(2):121-125. |
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| 作者姓名： | 苏晟 钱巧元 吕利清 王盛 |
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| 作者单位： | 上海航天电子技术研究所;上海卫星工程研究所 |
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| 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。
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| 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 |
| 收稿时间： | 2017/10/16 0:00:00 |
| 修稿时间： | 2018/1/5 0:00:00 |
Study on Effects of Surface Error on Beam Efficiency for Radiometer Reflector Antenna |
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| SU Sheng,QIAN Qiaoyuan,LYU Liqing and WANG Sheng.Study on Effects of Surface Error on Beam Efficiency for Radiometer Reflector Antenna[J].Aerospace Shanghai,2018(2):121-125. |
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| Authors: | SU Sheng QIAN Qiaoyuan LYU Liqing and WANG Sheng |
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| Affiliation: | Shanghai Aerospace Electronic Technology Institute, Shanghai 201109, China,Shanghai Aerospace Electronic Technology Institute, Shanghai 201109, China,Shanghai Satellite Engineering Institute, Shanghai 201109, China and Shanghai Aerospace Electronic Technology Institute, Shanghai 201109, China |
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| Abstract: | 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. |
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| Keywords: | physical optics reflector antenna surface error beam efficiency microwave radiometer Ruze-equation hardware-in-the-loop simulation numerical fitting |
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