一种卫星动中通阴影和波束指向偏差估计方法

当目标卫星被遮挡,或天线波束指向偏差较大时,卫星通信质量会变差,甚至导致卫星通信中断。针对卫星动中通阴影和天线波束指向偏差的问题,建立了一种综合考虑地理环境和波束指向偏差的接收信号功率模型,提出了一种基于接收信号强度特征参数的阴影判断和天线波束指向偏差估计方法,方法充分利用了卫星动中通信道特性,适用于接收信号的快变化和慢变化两种情况。当出现个别较大指向偏差值时,模型能够有效降低误差影响。最后给出了实验仿真结果,验证了该方法的有效性。

Evaluation of Blockage and Beam Pointing Errors in the SOTM System

When the satellite is blocked,or the error of the beam pointing to the satellite is large,the quality of satellite communication is likely to be bad, even to be interrupted. In this paper,the model of received signal power is built,which incorporates with the impacts of the local environment and the beam pointing. Various occasions can be recognized by evaluating the parameters of the received signal power model. This method makes full use of the SOTM channel property, it can work whether the received signal power varies fast or slowly. When a few beam pointing error is large than the acceptable value, the model can reduce the influence of the error effectively. Finally, the validity of the method is verified by the results of the simulation and measurements are provided.