日像仪观测太阳射电信号左右旋圆偏振的方法

发布时间：2018-04-22 17:08

本文选题：超宽带 + 电压驻波比　；参考：《中国科学院大学学报》2016年04期

【摘要】：使用Microwave Office软件,仿真分析MUSER-I(0.4~2 GHz)和MUSER-II(2~15 GHz)3 d B定向耦合器.电桥采用多节耦合器实现,且每节耦合器的长度为中心频率波长的1/4,对电桥进行分析并制作实物.实测结果表明,MUSER-I的3 d B定向耦合器的输出幅度在(-3±0.2)d B,输出端口相位差在91.9°~89°之间;MUSER-II的3 d B定向耦合器的电压驻波比在全频带范围内小于1.31,输出端口相位差在96.05°~85°之间.通过日像仪系统接收太阳左旋和右旋圆偏振射电信号,并计算信号的圆偏振度,得到观测圆偏振度与太阳信号本身圆偏振度之间的误差和太阳信号本身偏振度的关系.当太阳信号本身极化度为10%时,误差最大为9.4%.
[Abstract]:Microwave Office software is used to simulate and analyze MUSER-I(0.4~2 GHz) and MUSER-II(2~15 GHz)3 DB directional coupler. The bridge is realized by multi-section coupler, and the length of each coupler is 1 / 4 of the central frequency wavelength. The bridge is analyzed and made. The measured results show that the output amplitude of 3 dB directional coupler of MUSER-I is in the range of 3 卤0.2 dB, the phase difference of output port is between 91.9 掳and 89 掳, the voltage standing wave ratio of 3dB directional coupler of MUSER-II is less than 1.31 in the full frequency range, and the phase difference of output port is between 96.05 掳and 85 掳. The left and right circularly polarized radio signals of the sun are received by the heliograph system, and the degree of circular polarization of the signal is calculated. The error between the observed degree of circular polarization and the degree of circularity of the solar signal itself and the degree of polarization of the signal itself are obtained. When the polarization of the solar signal itself is 10, the maximum error is 9.4.
【作者单位】：中国科学院国家天文台中国科学院太阳活动重点实验室;
【基金】：国家重大科研装备项目(ZDYZ2009-3) 国家青年基金(11203042) 联合基金(U1231205) 国家自然科学基金面上项目(11573043)资助
【分类号】：P161

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