基于同心圆环的大间距子阵级阵列栅瓣抑制

摘要

适当增加单元间距和应用子阵级阵列有利于降低相控阵的设计成本,但是阵列的稀疏会带来不期望的栅瓣.为解决该问题,设计了一种无栅瓣阵列:子阵在平面内旋转,围绕阵列中心呈同心圆环分布.为保证子阵之间不会交叠,对圆环半径范围进行了分析.利用一种改进的穷举算法,对每一层圆环上的子阵个数以及圆环半径进行了计算机仿真优化.结果表明,以4×4子阵共1 024个单元为例,所提方法可抑制峰值旁瓣电平约-17.48 dB.%Increasing element spacing appropriately and using subarray-based arrays are favorable to reduce the production cost of phased arrays,however,the rarefied array has unexpected grating lobes.To solve the proplems,an array is designed with no grating lobe.The subarrays are rotated in plane,and are distributed in the concentric ring structure around the center of the array.The range of the ring radii are analyzed for ensuring that each subarray will not overlap.Computational simulation is carried out to optimize the number of the subarrays in each ring and the radii of the ring using an improved method of exhaustion.The results show that,taking 4 × 4 subarrays and 1 024 elements as example,the method provides suppression of peak side-lobe level of-17.46dB.