平面天线阵快速正交投影波束形成算法

针对大型平面天线阵列下样本数据含有期望信号时，正交投影（OP）波束形成算法不再适用的问题，提出一种新的基于阻塞矩阵的正交投影快速波束形成算法。该算法首先构造阻塞矩阵从样本信号中阻塞掉期望信号，再对阻塞后的样本信号进行施密特（GS）正交化得到重构后的干扰子空间，最后在此基础上实现正交投影波束形成。新算法适用于任意阵型的二维均匀平面阵，在小快拍数下能快速计算出自适应权重。仿真结果表明，无论是弱干扰信号还是强干扰信号，该算法都具有很好的抗干扰性能。

A Fast Orthogonal Projection Beamforming Algorithm for Planar Array

For antenna array with large number of elements, the traditional orthogonal projection (OP) algorithm is no longer applicable in the case that the expected signal is contained in sample data. To solve this problem, a new fast orthogonal projection algorithm based on block matrix is proposed in this paper. First, a block matrix is developed to block the expected signal in sample signal. Secondly, the sample signals after blocking process are employed to reconstruct interference subspace utilizing Gram-Schmidt orthogonalization. Lastly, traditional orthogonal projection algorithm is followed. The new algorithm applies to uniform planar array of arbitrary structure and adaptive weights can be computed rapidly. Simulation results show that the new algorithm provides good performance whether for strong interference signal or weak interference signal with few snapshots.