基于最优宽带性能的相控阵设计研究

Phased Array Design for Optimum Wideband Performance

针对现阶段对具有宽带信号接收能力相控阵的需求,提出了一种最优宽带性能的阵列设计方法。首先总结出均匀型子阵系统子阵数与阵列宽带特性之间的规律,然后在充分考虑子阵数、延时器及移相器量化精度、旁瓣电平及主瓣偏移和工程实用性的条件下,对粒子群算法(particle swarm optimization,PSO)进行改进并将其应用于阵列不均匀划分的优化中,得到了一种最优宽带性能的子阵划分方式。仿真验证表明,与均匀划分阵列相比,相控阵采用优化后的子阵划分方式并结合子阵级实时延时器技术,可以有效提高阵列瞬时工作带宽。最后总结文章方法和均匀型子阵系统实现阵列宽带扫描方法的优缺点。

Aiming at the current demand of phased array with capability of broadband signal reception,an array design method to achieve optimum broadband performance is proposed. First,laws between the number of subarray in uniform-subarray system and wideband characteristics are summarized. Second,in full consideration to the number of subarray,quantization precision of true time delay,phase shifter,sidelobe level,main lobe offset,and engineering practicality,a subarray division method with optimum broadband performance is achieved by improving particle swarm optimization. Simulation shows that,compared with the evenly divided array,the instantaneous bandwidth performance can be improved when the true time delay at subarray level is used in the optimized divided array. Last,the advantages and disadvantages between the proposed method and the uniformsubarray system method in realizing broadband scan are summarized.