超宽带天线极化特性对相位干涉仪测角精度的影响

The influence of polarization characteristic of the ultra-wideband antenna on the phase interferometer

在超宽带相位干涉仪体制测角系统的使用过程中发现,该体制对天线极化特性敏感,严重影响测角精度,尤其在低频段表现明显.文章对一种超宽带Vivaldi天线的极化特性进行了建模,从理论上分析了天线极化特性对来波信号极化测量的影响,其导致相位干涉仪测角系统精度降低.最后,试验测试证明了天线交叉极化特性对相位干涉仪测角精度的负面影响,并提出一种通过修正接收天线极化特性提高测角精度的途径,试验结果表明其可以显著提高测角精度.

In the application of ultra-wideband antenna phase interferometer system,it is found that the system is sensitive to the polarization characteristic of the antenna,which seriously affects the angle measurement accuracy,especially in the low frequency band.The polarization characteristic of an ultra-wideband antenna were modeled,and the influence of polarization characteristic of the antenna on the polarization characteristic of incoming wave is analyzed,which finally leads to the decrease of the angle measurement system of the phase interferometer.The influence of polarization characteristic of the ultra-wideband antenna on the angle measurement accuracy of the phase interferometer is verified by practical test,and a way to improve the angle measurement accuracy is proposed and the result shows that the way could improve the angle measurement accuracy obviously.