一种广域稀布雷达低旁瓣波束形成方法

A Beam-forming Method with Low Side-lobe for Widely Sparse Radar

广域稀布雷达具有抗干扰、抗摧毁能力强等优点,但是其方向图会因阵元稀布而存在大量的高旁瓣;提出一种脉组内捷变频联合波束形成方法,通过在雷达的连续脉组内发射不同频率的信号,并将不同频率的信号进行相参合成,在使主瓣电平不变的情况下,得到更低的旁瓣电平;通过与遗传算法相结合,并设定适当的约束和适应度函数,经迭代优化后的布局,可以得到具有更低的旁瓣电平的方向图;仿真结果表明:经该方法优化后,广域稀布线阵旁瓣电平降低至-11.85 dB,广域稀布面阵方位向和俯仰向旁瓣电平分别降低至-14.18 dB及-14.73 dB;该方法可以有效降低广稀疏阵列的旁瓣电平。

Widely sparse radar has the advantages of anti-interference and anti-destruction capability.However,its radiation pattern will contain a large number of high side-lobe due to sparse array elements.A beam-forming method is proposed by combining with intra-pulse frequency agility signals,which can form lower side-lobe level while maintaining the main-lobe level by emitting the signals of different frequencies in pulses group of the radar and coherently synthesizing the signals of different frequencies in the airspace.By combining with the genetic algorithm and setting the appropriate constraints and fitness functions,the radiation pattern with the lower side-lobe flap can be formed after the iterative optimization.The simulation results show that after optimization by this method,the side-lobe level of the widely sparse linear array is reduced by-11.85 dB,and the azimuthal and pitch side-lobe levels of the widely sparse planar array by-14.18 dB and-14.73 dB respectively.The method can effectively reduce the side-lobe level of the widely sparse array.