摘要
针对雷达观测目标近场电磁散射的天线相关问题,发展了基于偶极子模型的天线辐射场建模方法。偶极子模型包括电偶极子与磁偶极子,其位置均匀分布于天线辐射口面,通过偶极子辐射场坐标变换和天线辐射场球面波展开(spherical wave expansion,SWE),建立了偶极子参数与天线辐射场SWE系数之间的线性矩阵方程,并采用奇异值分解(singular value decomposition, SVD)方法实现了偶极子参数的最小二乘估计。对喇叭天线、波导缝隙天线和微带贴片阵天线进行偶极子建模实验,建立了这三种天线辐射场建模误差小于1%的等效偶极子模型,通过对等效偶极子模型预测任意观测距离天线辐射场精度的评估,验证了基于均匀分布偶极子建模天线辐射场的有效性。
Target electromagnetic scattering is related to radar observed antenna in the near field,and a modeling method for antenna radiation field is developed based on dipole models.The dipole models include electric and magnetic dipoles whose position is uniformly distributed on the antenna radiation aperture.Through coordinate transformation of dipole radiation field and spherical wave expansion(SWE)of antenna radiation field,a linear matrix equation is found between the dipole parameters and the SWE coefficients of antenna radiation field.The least square estimation for dipole parameters is obtained based on an algorithm of singular value decomposition.The experiments for three types of antennas,including an horn,slotted wave guide,and patch array,are executed to verify the modeling accuracy of dipoles.The equivalent dipole models with a modeling error less than 1%for the three antennas is achieved,respectively.Also,the accuracy of predicting the radiation field of antennas at any observation distance using the equivalent dipole models is evaluated.The results demonstrate that the effectiveness of modeling antenna radiation field based on uniformly distributed dipoles.
作者
李永晨
林嘉轩
廖意
王晓冰
LI Yongchen;LIN Jiaxuan;LIAO Yi;WANG Xiaobing(National Key Laboratory of Scattering and Radiation,Shanghai 200433,China)
出处
《电波科学学报》
CSCD
北大核心
2024年第3期484-491,共8页
Chinese Journal of Radio Science
基金
国家自然科学基金(62001296)。
关键词
天线辐射场
建模
偶极子
球面波展开
奇异值分解(SVD)
antenna radiation field
modeling
dipole
spherical wave expansion
singular value decomposition
