零点约束的有向阵元圆阵方向图最优综合

圆形阵列由于可实现全空间无模糊的波束扫描而得到广泛应用。给出了基于最小均方误差准则下有向阵元均匀圆阵的最佳方向图综合方法。在无约束和带零点约束两种情况下，分别给出了相应最优权值的求解公式。由于圆形阵列具有较高的近轴旁瓣电平，通过对主波束附近的旁瓣增加零点约束条件来达到降低近轴旁瓣电平的目的。研究表明,不同零点约束会对旁瓣电平有明显的影响，合适的零点位置能明显改善方向图的近轴性能。该方法简单易行，适合在圆形相控阵天线中使用。仿真给出了对近轴旁瓣电平改善最明显的零点位置。

Optimal pattern synthesis with nulls for circular array based on directional elements

Circular array is widely used for its whole space beam scanning without the fuzzy. By using the principle of minimum mean square error, the optimal synthesis method of uniform circular array based on directional elements is given. The relevant optimal weighted vectors are respectively given in the two conditions of non constrained and null constrained. The method of adding null constrained to the area surrounding the main beam is proposed to lower the high side lobe level. The simulation analysis shows that the performance improvement in side lobe level is different when the null constrained is added in different locations, and an obvious performance improvement can be obtained if the null location is suitable. This method is simple and is suitable for circular phased array antenna in application. The null location of the most obvious performance improvement is given.