| 摘要: |
| 针对船载卫通站使用线极化卫星通信过程中出现的反极化信号干扰问题，根据不同
状态下信号电平变化，发现干扰信号强度与天线跟踪角度有关。结合天线采用的三轴稳定体
制结构特点，建立天线转动几何模型，通过不同跟踪模式下天线角度的比较，对其相互关系
进行了分析，推导出了该体制下极化角计算公式，据此进行极化补偿，有效解决了EC模式下
跟踪线极化卫星出现的极化隔离度下降问题，并对由此引起的极化限位问题采取了应对措施
。应用结果表明，分析正确，方法可行，可为其它卫通站解决类似问题提供参考。 |
| 关键词: 卫星通信站 天线跟踪 反极化 极化角 隔离度 补偿 |
| DOI： |
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| 基金项目: |
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| Solution to the influence of elevation&cross tracking mode on polarization angle |
| LIN Xi-liang,ZHOU Jin-biao,ZHAO Qian-hong,WANG Kai-ya |
| () |
| Abstract: |
| Counterpolarized interference appeared in the communication
through linearly polarized satellite in the shipborne earth station. Difference
of the signal power level in different status indicated that the intensity of i
nterference is related to the tracking angle of antenna. Geometrical model of a
ntenna movement is built according to the characteristics of tripleaxis pedes
tal antenna stabilization system. By comparison of antenna angle in different tr
acking modes, the correlation between them is analysed and the theoretical expre
s
sion for calculating polarization angle in this system is derived. The problem o
f polarization isolation declining in E&C(Elevation & Cross) tracking mode is so
lved by polarizati
on angle compensation during the process of tracking linearly polarized satellit
e. Means to prevent polarization angle from overrunning the angle limit resulted
from compensation is considered. The application proves that the analysis is
proper and the solution is feasible which can help other satellite commun
ication earth stations to solve similar problems. |
| Key words: satellite communication station antenna tracking counter polarization polarization angle isolation compensation |
