本文闸明了地球站天线产生极化夹角的原理；
This paper described the principle of creating a polarization dihedial angle.
通过分析工作门限对不同天线口径地球站的影响，给出了一种新的工作门限设计方法。
Based on the analysis of the influence of working threshold on earth stations which are equipped with antennas of different apertures, a new design method of working threshold is proposed.
该天线采用了双万向接头结构，以便航太器在月球轨道跟踪地球站基站。
The antenna employs a dual gimbal mechanism to track the earth station when the spacecraft is in lunar orbit.
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