基于实时引导修正的大口径天线对星快速校相方法

A method of quickly adjust phase between sum and diff channel in large aperture parabolic antenna by satellite based on real-time guide angle correction

对测控站中快速校准和差通道相位的方法进行了原理分析,以18 m口径天线为例,论证了在X频段下大口径天线的空间波束相对于S频段更窄,利用X频段空间目标进行快速校相时需要天线系统提供更高的指向精度来满足校相时的角度偏置处于主瓣内。通过分析抛物面天线的指向误差源和模型,提出了基于该模型进行目标引导数据误差反向修正的工程应用方法,可显著提高X频段下天线电轴对于空间动态目标的指向精度,从而保证大口径天线对于X频段目标快速校相的成功率,并以18 m测控数传一体化抛物面天线系统作为对象在工程上进行了对星校相验证,效果优良。

This paper analyzed the principle of method which adjusts the phase between sum and diff channel quickly.An antenna with 18 m diameter is discussed as an example,it is proved that the lobe of large aperture antenna is narrower under X band relative to the S band,illustrates a higher pointing accuracy is necessary when using X band space target as the electric signal source to complete quickly phase adjust which can make sure that the target is still in the main beam after offsetting the electric axis.By analyzing the pointing error source and model of the parabolic antenna,a method is put forward based on angle pointing error model and to correct angle using offset which calculated by angle measuring error parameters,can significantly improve the antenna electrical axis pointing accuracy for target,so as to ensure the large aperture antenna for X band target of quickly phase adjust success rate.This method has been verified in engineering effectively.