一种基于遗传算法的不等间距二维非周期阵面

A genetic algorithm based unequal spacing 2D aperiodic array design

目前大规模地基固态相控阵由于成本原因,普遍采用大单元间距以减少通道数。在这种间距下,可视空间会出现栅瓣效应,天线性能恶化,雷达扫描范围受限。对阵面设计方法进行研究,提出一种不等间距阵面优化方法。仿真结果表明,在λ×λ单元口径下,实现±20°的扫描角度内栅瓣低于-20 dB;由于阵面口径增大,阵面方向性增强,单元数减少18%。

Large spacing is widely used in building large scale ground based solid state phased array due to the cost.Grating lobe will appear under this large spacing,which leads to performance deterioration.The sweep angle can be broadened by using the thinning method.In this paper,the array design methods are studied,and an unequal spacing optimization method is presented.An array with grating lobe lower than-20 dB is implemented in±20°sweep angle by usingλ×λelement.The number of units is reduced by 18%due to the enlarged aperture.