一种低旁瓣子阵级自适应波束形成方法

摘要

相控阵雷达在军事上的应用日渐广泛,要满足雷达系统性能日益增长的需求,必须采用大孔径天线,以便得到更高的角度和距离分辨率.大型面阵的全自适应波束形成计算量庞大,采用子阵级自适应波束形成可以用较小的代价实现较优的自适应性能.研究了等幅平面阵的子阵级波束形成技术,并针对非均匀划分的子阵结构,采用了子阵级通道噪声功率的归一化处理.该方法不仅能够有效降低子阵级方向图的旁瓣电平,其自适应性能保持良好.仿真验证了该方法的有效性.%Phased array radars have found wide applications in military fields. In order to meet the increasing need of high-resolution measurements in range and angle, large aperture antenna is been used. For large planar arrays, the full adaptive beamforming has huge calculation quantity. Adaptive beamforming at subarray level can reach suboptimum performance at a lower cost. Beamforming technology at subarray level is researched for uniform planar array, and a normalization process of noise power has been adopted at each subarray receiving unit for irregular configuration subarrays. Lower sidelobes and good adaptive performance have achieved of the antenna pattern at subarray level. Simulation results proved the validity of the proposed method.