快速正交投影波束形成新方法

新算法利用阵列快拍数据直接构造噪声子空间,然后将约束导向矢量向噪声子空间投影得到波束形成的权矢量。新算法的性能与正交投影算法相同,但不需要进行矩阵特征分解,运算量大大减小,易于工程实现。就算法不损失系统自由度,克服了差分快速投影法在空间干扰与目标方向呈对称分布时具有明显信号对消的缺点。计算机仿真结果说明了新方法的有效性。

Fast beamformer via orthogonal projection

The novel algorithm directly constructs the noise subspace by means of array data snapshots, and then obtains the weight vector, which is the orthogonal projection of the constrained steering vector onto the estimated noise subspace. The perfomance of the presented method is the same as that of the orthogonal projection algorithm. The new method significantly reduces the computational load, and is implemented easily in engineering because it does not require eigen-decomposition. compared with the fast orthogonal projection algorithm using the difference covariance matrix computation in the literature, the new technique does not lose the system freedoms, and overcomes its drawback of the signal cancellation when the direction of interference is symmetric with that of target. The computer simulations demonstrate the effectiveness of the proposed method.