改进的辅助变换相干干扰抑制波束形成技术

摘要

提出一种相干干扰下自适应波束形成方法.该方法同时约束非相干干扰与相干干扰,更好地实现对此两类干扰方向的自适应零陷滤波.采用变换预处理,避免抑制期望信号；恢复噪声特性并采用对角加载技术,增强算法稳健性；采用拉格朗日乘子法得到最优波束形成算法.理论分析与仿真结果表明,保持阵列孔径不变时,该算法提高了输出信干噪比和稳健性.%A method of adaptive beamforming in the presence of coherent interference is proposed. Meanwhile restraining noncoherent interference and coherent interference, nulls of these types of interference directions are formed. Using transform preprocessing, suppression of the desired signals is avoided. Recovering characteristics of the noise and using diagonal loading techniques, the robustness of algorithm is improved. And then applying Lagrange multiplier, the optimal beamforming algorithm is presented. Simulation results show that output signal-to-interference-plus-noise (SINR) and robustness are increased when keeping the array aperture invariable.