非均匀广义对角加载稳健波束形成算法

A Robust Beamforming Algorithm Based on Non-Uniform Generalized Diagonal Loading Method

为解决阵列天线在信号接收过程中利用一般对角加载算法在抑制噪声影响的同时降低干噪比、使零陷变浅的问题,提出了一种非均匀广义对角加载稳健波束形成算法。该算法首先根据接收数据协方差矩阵的特征值,对不同的信号自适应地选择不同加载因子,并利用选择的加载因子通过矩阵重构构造广义对角加载矩阵对接收数据进行加载处理,最后通过Capon算法得到波束形成向量。仿真结果表明:该算法在消除噪声影响的同时,可以有效展宽零陷并使零陷深度达到-50dB,而且通过非均匀加载降低输入信号的信噪比,在期望信号波达方向误差为2°时,比一般对角加载算法输出信号的干噪比高10dB,具有较好的稳健性。

A new non-uniform diagonal loading beamforming algorithm is proposed to solve the problem that the general diagonal loading method, which is utilized in array antenna receiving signal process to suppress the influence of noise, loads all kinds of signals with the same loading factor and shallows the null. The proposed method chooses different loading factors for different signals according to eigenvalues of the received signal covariance matrix, and then a generalized loadinq matrix with the selected loading factors is reconstructed to deal with the received signal. The boauaforming vector is finally obtained through the Capon algorithm. Simulation results show that the proposed algorithm eliminates the influence of noise and broaden the null to a depth of 7.0 dB. Moreover, the ratio of the desired signal to noise of the input signal is decreased through the non-uniform loading. When the DOA error of the desired signal is 2°, the output SINR of the proposed method is 10 dB bigger than that of the general diagonal loading method. Therefore, the proposed method has a better robust performance.