脉冲天线阵列时域辐射场快速计算的简化方法

采用有源单元方向图思想，在考虑互耦情况下，将大型脉冲阵列天线各单元的时域方向图用相似环境下小型阵列的有源单元方向图来等效，进而叠加计算辐射总场。以此为基础，结合时域辐射原理改进了上述方法。通过公式推导得出:一个大型线阵或大型平面阵的时域辐射场可分别通过两个小型线阵或四个小型平面阵的时域辐射总场计算得到，避免了传统方法中小阵有源单元方向图逐元提取的繁琐操作。采用上述方法分别计算了一个13元线阵和一个1113元平面阵列，计算结果与软件仿真结果吻合良好，与传统的小阵外推方法相比，直线阵列和平面阵列的计算量分别减少了56.8%和81.17%。

Simplified method for fast calculating time-domain radiation field of pulsed antenna arrays

In consideration of the mutual coupling, the active element pattern (AEP) theory is adopted to calculate the time-domain radiation field of large pulsed antenna arrays. The AEPs of a large array can be transformed into those of a small array under similar mutual coupling condition, and the radiation field of the large array is obtained by superposing AEPs of all the elements. On this basis, an improved method is proposed combined with time-domain radiation theory. By formula deriving, the analysis of a large linear array or a large planar array can be respectively converted into that of two small linear arrays or four small planar arrays. In comparison with the original method, calculating all AEPs of subarray is avoided. A 13 linear array and an 1113 planar array are calculated for verification, the results agree well with software simulation results. Compared with the original method, the calculation is reduced by 56.8% for the linear array and 81.17% for the planar array.