采用FFT-PSO策略的多约束稀疏阵天线方向图综合

采用稀疏布阵的相控阵测控天线,阵元等幅激励时的阵列峰值副瓣电平无法满足指标要求.在考虑天线增益、半功率波束宽度等指标约束时设计了合适的适应度函数,并基于粒子群算法(PSO)对阵元激励幅度进行优化以降低天线副瓣电平.同时,分析了等间距栅格平面阵列天线方向图与离散傅里叶变换的关系,采用快速傅里叶变换(FFT)降低了阵列方向图计算复杂度.仿真结果表明,该方法可有效降低峰值副瓣电平和计算复杂度.

Thinned array antenna pattern synthesis with multiple constraints using FFT-PSO strategy

For the thinned array antenna,the peak sidelobe level ( PSLL) of the array with equal amplitude excitation can not meet the requirements of the designed performances. Considering the constraints of an-tenna gain and the half-power beamwidth,the appropriate fitness function is designed,and the excitation amplitude of the element based on particle swarm optimization ( PSO) is optimized to reduce the antenna sidelobe level. Meanwhile,the relationship between the pattern of planar phased array with rectangular grid and the discrete Fourier transform ( DFT) is analyzed,then the fast Fourier transform ( FFT) is used to re-duce the computational complexity. The simulation results show that the proposed approach can effectively reduce the maximum PSLL and the computational complexity.