论文部分内容阅读
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 effectively reduce the sidelobe level of the array antenna in the process of digital beamforming, a low-sidelobe adaptive beamforming method implemented by a quadratic array antenna is proposed. On the basis of subarray division of overlapping arrays, the desired signals and interference signals are adaptively beamformed through subarrays to gain the gain of the desired signals and suppress the depth of the interference signals. On the basis of sub-array digital beamforming, the output of each sub-array is applied to the output of each sub-array by using the method of the second-group array, the beamforming of the pattern of the second-group array is performed under the constraint condition, Elimination of compensation, so as to achieve the purpose of reducing the side lobe. Theoretical analysis and experimental simulation show that compared with the conventional LCMV method, the beamforming method based on the quadratic array array can effectively reduce the sidelobe level in the directional pattern while ensuring the suppression of the interference signal depth and improve the system Anti-jamming performance.