基于二次组阵的低旁瓣波束形成方法

A Low-sidelobe Beam Forming Method Based on Secondary Combination of Array

为了有效地降低阵列天线在数字波束形成过程中旁瓣水平,提出了一种通过二次组阵实现的低旁瓣自适应波束形成方法。在阵列相互重叠的子阵划分基础上,通过子阵对期望信号及干扰信号进行自适应波束形成,实现对期望信号的增益接收以及对干扰信号的深度抑制。在子阵数字波束形成的基础上,对各个子阵的输出运用二次组阵的方法,对二次组阵的方向图在约束条件下进行波束合成实现对子阵方向图中旁瓣的对消补偿,从而达到降低旁瓣的目的。通过理论分析和实验仿真表明,与常规LCMV方法相比,基于二次组阵的波束形成方法在保证了对干扰信号深度抑制的同时,有效地降低了方向图中的旁瓣水平,提高了系统的抗干扰性能。

In order to reduce the sidelobe level of the pattern for the array antennas,this paper proposes a low-sidelobe adaptive beam forming method based on secondary combination of the array elements.With partition of the overlapped subarrays,the adaptive beam is achieved by the subarrays for the desired signals and the jamming signals,the desired signals are amplified and the jamming signals are deeply restrained by the beam.Based on the digital beam forming for the subarrays,the outputs of the subarrays are combinated secondarily as the array elements.The pattern of the secondary combination array is synthetised on the constraint condition to oppositely compensate the pattern of the subarray,thus the sidelobe of the pattern is reduced.Theoretic analyses and simulation results show that,as compared with the regular LCMV method,the method based on secondary combination of the array could depress the sidelobe levels of the pattern while ensure the restrained depth for jamming signals,and the performance of the system in the anti-jamming is greatly improved.