雷达吸波结构的FGA优化设计

Design of broad-band radar absorbers using genetic algorithms

本文采用浮点数编码遗传算法对多层涂敷型的吸波结构进行优化设计时,引入分段变参数遗传算法和权值调整技术来解决算法的早熟和吸波结构性能的宽角适应性问题。文中首先建立了适用于吸波结构优化设计的理论模型,然后设计算法使吸波结构在任意给定的频段和入射角度范围,通过对吸波结构的每层材料电磁参数及其厚度的优选使其吸波性能达到最佳,最后给出了吸波结构的点频和宽带的数值仿真结果。

In order to solve the problems of the slow convergent speed and non-global convergence of the canonical genetic algorithm in the optimal procedure for broadband radar absorbing materials with high absorptivity, we represented the chromosome with floating point number; we also utilized a special strategy to avoid trapping in premature convergence. In the end,we fulfilled the algorithm to determine the optimal material choice for each layer and its thickness. The optimal choice results in absorbers which maximally absorbs incident plane waves for a prescribed range of frequency and incident angles. The algorithm was successfully applied to the design of radar absorbers at a single frequency point and in the frequency ranges of 2-18GHz.