地理位置对卫通天线跟踪的影响

Effect of Geographical Location on Tracking of Satellite Communication Earth Station

根据某型船载卫通站在B极化跟踪问题中的实践经验,分析归纳出地理位置对卫通天线的和差通道极化状态造成的影响,从而造成跟踪失败的原因,并给出解决方法。随着地理位置的变化,不同极化状态的和差信号的初始相位差ΔΦ会发生改变,导致跟踪接收机的交叉耦合特性发生改变,天线无法进行自跟踪。对于移动地球站而言,保证跟踪信号和差通道的极化状态一致是十分必要的。针对A、B极化2种不同的通信模式,提出一种简单的跟踪接收机校相方式。

According to the practical experience of maritime satellite station tracking with B polarization, we analyze and summarize the effect that different geographical locations bring to polarization of sum/difference channels, as weU as the reason of tracking fault, and then put forward the solution. With the change of geographical location, the polarization of sum/difference channels is different, the phase difference △Φ between sum and difference signals will change and the cross-coupled feature of tracking receiver will change, so the antenna can not keep tracking automatically. Foe the mobile earth station, it is very necessary to keep the polarization state of sum/difference channels of the tracking signal be same. For the different communication modes of A and B, we propose a simple method of phase calibration for tracking receiver.