采用幅度响应约束的鲁棒自适应波束形成算法

发布时间：2018-05-21 16:32

本文选题：波束形成 + 鲁棒性　；参考：《西安交通大学学报》2014年04期

【摘要】：针对大导向矢量失配误差造成传统自适应波束形成算法鲁棒性下降的问题,提出采用幅度响应约束的鲁棒自适应波束形成算法。该算法首先对接收数据协方差矩阵失配进行建模优化,然后根据已知的多径相干信号大致来波方向信息对波束主瓣进行幅度响应约束,并利用所提引理将优化问题转化为迭代二阶锥规划问题,最后对权矢量直接进行求解获得最佳值。仿真结果表明:该算法能够针对多径相干信号形成多波束主瓣,自由控制波束主瓣宽度和纹波水平。当期望信号的方向偏差达到3.5°、输入信干噪比在-5~10dB范围内变化时,该算法的阵列输出信干噪比优于不确定集类算法0~6dB,对大导向矢量失配误差鲁棒性更高。
[Abstract]:Aiming at the problem that the robustness of traditional adaptive beamforming algorithm is reduced due to the mismatch error of large steering vector, a robust adaptive beamforming algorithm with amplitude response constraints is proposed. Firstly, the covariance matrix mismatch of received data is modeled and optimized, and then the amplitude response of the main lobe of the beam is constrained according to the known direction information of the multipath coherent signal. The Lemma is used to transform the optimization problem into an iterative second-order cone programming problem, and the optimal value is obtained by solving the weight vector directly. The simulation results show that the algorithm can form multibeam master lobe for multipath coherent signals and freely control the width and ripple level of the main lobe. When the direction deviation of the desired signal reaches 3.5 掳and the input signal-to-noise ratio varies in the range of -5 ~ 10 dB, the array output signal-to-noise ratio of the proposed algorithm is better than that of the uncertain set algorithm of 0 ~ 6 dB, which is more robust to the large steering vector mismatch error.
【作者单位】：第二炮兵工程大学907教研室;中国人民解放军96111部队;第二炮兵工程大学403教研室;电子工程学院博士后流动站;
【基金】：国家自然科学基金资助项目(61179004,61179005) 中国博士后科学基金资助项目(2012M521843)
【分类号】：TN911.7

【参考文献】