基于FFT和共轭梯度法的近场诊断方法

Near-field Diagnosis of Array Antenna Based on FFT and Method of Conjugate Gradient

介绍了一种相控阵天线口径场诊断方法,本方法基于等效磁流法,通过引入矩量法建立近场测量数据域天线口径场分布的矩阵方程,再应用共轭梯度法求解该矩阵方程以获得相控阵天线的口径场分布,达到对口径场进行诊断的目的。同时引入探头补偿技术,利用探头平方根法,消除了探头对测量数据的影响。选取平面阵列进行数值仿真验证了该方法的正确性,并在微波暗室中对某相控阵天线进行了诊断试验,证明了该方法的有效性与实用性。

A method for diagnosing of aperture of antenna is presented.This method is based on equivalent magnetic current.With the introduction of method of moment,an equation about the distribution of the aperture of the antenna is built up with data collected in the near-field.The method of conjugate gradient is used to solve the equation and obtain the distribution of the aperture of phased array antenna,so as to diagnose the aperture.With the introduction of probe compensation,this method could remove the influence to near-field data caused by probe.What is more,the correctness of this method is demonstrated using the numerical simulation of planar array.A diagnosing experiment is conducted in microwave darkroom to examine the efficiency and practicality of this method.