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针对星载多波束天线幅相误差对天线性能影响较大的问题,通过对多波束发射天线的射频通道在不同温度下的幅相特性进行试验测定,得到了通道幅相特性与温度的对应关系,发现不同通道的幅相特性与通道温度的关系曲线在给定温度区间内基本呈线性关系,且斜率基本一致,从而确定了对不同通道的幅相特性进行固定值补偿的校准策略.通过固定值补偿后,各通道的幅相特性曲线基本重合,从而消除了通道间幅相误差.进一步给出了提升温度一致性的措施,并设计了多波束发射天线的校准原理框图和校准流程图.结果表明:新的星载多波束天线幅相误差校准方法是有效的.
Aiming at the problem that the amplitude and phase error of spaceborne multibeam antenna greatly affects the antenna performance, the amplitude and phase characteristics of the RF channel of multibeam transmitting antenna at different temperatures are experimentally determined, and the corresponding relationship between the amplitude and phase characteristics of the channel and the temperature is obtained The results show that the curves of amplitude and phase of different channels have a linear relationship with the channel temperature in a given temperature range and the slopes are basically the same so as to determine the calibration strategy of compensating the amplitude and phase characteristics of different channels with fixed values. After the value is compensated, the amplitude and phase characteristic curve of each channel basically coincide, so as to eliminate the amplitude and phase error among the channels. The measures to improve the temperature consistency are further given and the calibration principle block diagram and calibration flow chart of multi-beam transmitting antenna are designed. The results show that the method of amplitude and phase error calibration of the new spaceborne multibeam antenna is effective.