一种均匀激励稀布圆平面阵列的方向图综合算法

Approach for pattern synthesis of uniform-excited sparse circular planar array

针对含有较多单元、均匀激励稀布圆平面阵列的方向图综合,提出了一种基于差分进化(DE)的设计算法。首先按照部分密度锥削的方案来初始化阵列的单元分布,然后对阵列中的圆环设置一组旋转角变量,利用DE算法对其进行优化并保留最佳结果。最后选择前一步所得阵列中同一圆环上间距大于半波长的单元作为优化对象,在最小间距约束条件下,采用DE对这些单元的位置进行优化以进一步降低阵列的旁瓣电平。数值试验结果表明了算法的有效性。

For the pattern synthesis of uniform-excited sparse circular planar array with many elements,a third-order algorithm based on differential evolution(DE)is proposed.First,the element distribution in array is initialized according to the scheme of partial density taper,and then a group of rotation angle variables is set for the rings in array,which is optimized using the DE algorithm and the best result is retained.Finally,for the array obtained in the previous step,elements spaced greater than half wavelength on the same ring are selected as the optimization objects,and their locations are further optimized by DE under the constraint of minimum spacing in order to reduce the sidelobe level of the array.Numerical results have verified the effectiveness of the proposed method.