The influence of antenna direction on TWSTFT

2016 IEEE International Frequency Control Symposium (IFCS) Pub Date : 2016-09-12 DOI:10.1109/FCS.2016.7546831

Yuejuan Jing, Wei Guang, Huijie Song, S. Dong, Hong Zhang, Huanxin Li, Haibo Yuan, Z. Shuhong, Jihai Zhang

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Abstract

The two-way satellite time and frequency transfer (TWSTFT) is the most accurate time synchronization method currently. Antenna is an indispensable element and plays an important role in the earth station of TWSTFT, its direction has a definite effect on the signal quality and performance in TWSTFT. In this paper, some preliminary test results are introduced by using the new TWSTFT system of Ku band with a 2.4 meters tracking antenna in National Time Service Center (NTSC). Through the experiment, we have obtained some data according to different antenna direction, by the analysis we can know: the change of azimuth angle is more sensitive than elevation angle during receiving the signal; in theory, the biggest deviation of azimuth angle should be symmetrical in both sides and asymmetric actually, the deviation of elevation angle is also. The deviation is the angle apart from the pointing of antenna at which receiving signal is the best. It can offer a powerful reference for antenna pointing deviation in earth station of TWSTFT and provide theoretical foundation for the antenna direction and high precision time transfer and synchronization.

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天线方向对TWSTFT的影响

卫星时频双向传输(TWSTFT)是目前精度最高的时间同步方法。天线是TWSTFT地面站中不可缺少的元件，在TWSTFT地面站中起着重要的作用，其方向对TWSTFT地面站的信号质量和性能有一定的影响。本文介绍了在国家授时中心(NTSC)使用2.4 m跟踪天线的Ku波段新TWSTFT系统的一些初步测试结果。通过实验，我们根据不同的天线方向得到了一些数据，通过分析可知:在接收信号时，方位角的变化比仰角的变化更敏感;理论上，方位角的最大偏差应该是两边对称的，实际上是不对称的，仰角的偏差也是不对称的。偏差是指在天线指向之外接收信号最佳的角度。可以为TWSTFT地面站天线指向偏差提供有力参考，为天线方向和高精度时间传输与同步提供理论依据。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2016 IEEE International Frequency Control Symposium (IFCS)

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