三元组近场效应的馈电系数修正与各向异性分析

Feeding coefficient correction and anisotropy analysis for the near field effect of triad

对半实物射频仿真中的三元组馈电系数计算公式进行了修正,使之能够克服比相式单脉冲雷达导引头的射频仿真的三元组近场效应问题。通过分析仿真场景与真实场景之间的等效性方程,给出了可以方便使用的馈电系数修正公式。该公式可以仅依赖导引头天线基线长度,而无需依赖基线的方向。还给出了三元组近场误差的解析表达,指出三元组构型是造成近场误差各向异性的原因,并指出三元组近场误差可以分解为与导引头自旋无关的固定误差部分,以及与导引头自旋有关的可变误差部分。

The near field effect of triad in radio frequency simulation system(RFSS)for phase comparison mono-pulse radar is overcomed,with the feeding coefficient of the triad being corrected.An equation is given for calculating the practical corrected feeding coefficient through analyzing the equivalence between the field test and the simulation test in anechoic chamber.The equation only depend on the length of the base line of the receiver,but not on the orientation of the base line.The analytical expression of the triad near field error(NFE)is also given,and it is shown that the configuration of the triad is the cause of the anisotropy of the NFE.It is shown that the triad NFE can be divided into two parts according to the spin of the receiver aperture,one is constant,and the other is variable.