基于最小二乘聚焦矩阵的宽带信号DOA估计

提出基于最小二乘的聚焦矩阵构造方法，首先，对宽带信号的每个频率分量，在所有可能的角度上构造方向向量；其次，在聚焦的频率点上，构造这些方向上的方向向量；最后，根据构造的方向向量，采用最小二乘方法求解聚焦矩阵。该方法不需要对DOA进行预估计，具有较好的稳定性和较高的角度分辨率。经计算机仿真验证，该方法是正确的。

DOA Estimation of Wide-Band Signalwith Frequency Focus Matrix Based on Least Square Method

Frequency focus matrix based on least square method was brought forward. First, directional vectors were constructed for every frequency of the wide-band signal at all possible direction. Then, the directional vectors were constructed for the focus frequency at all the directions. Finally, the least square method was applied to get the focus matrix according to the directional vectors. This method avoided pre-estimation of the DOA of the wide-band signal, and was of high stability and angle resolution. Computer simulation was made to test it finally, and the result was correct.