对数周期天线方向图的矩量法估计

Estimation to the directional pattern of log-periodic antenna by moment methods

在宽带二维波达方向估计系统中 ,天线阵列的方向图估计将直接影响波达方向估计的算法及精度。该文从天线辐射的积分算子方程出发 ,采用矩量法和快速多极算法(FMA) ,计算并分析了对数周期天线的方向图和阻抗矩阵 ,计算机仿真及天线外场实测表明 :理论计算方向图与实测天线方向图数据在 E面有较好的一致性 ,而在 H面 ,仿真方向图和实测方向图数据有一些差别 ,这些差别主要由矩量法的物理模型所引起。对数周期天线方向图矩量法估计的完成 ,为宽带二维空间波达方向 (DOA)

Arithmetic selection and precision of direction of arrival (DOA) estimates based on the integral operator equation of electromagnetic field of wide band antenna radiation are directly affected by the estimate of the antenna array pattern. The directional pattern and impedance of log periodic antenna are estimated using moment method and fast multi pole algorithm (FMA). The simulation agrees well with the experimental results for the E plan, while there were some differences for the H plan due to the physical model in the moment method. These results provide a basis for the engineering design of antenna array of wide band 2D DOA estimation systems.