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提出了一种基于空时DFT投影的宽带信号二维角估计算法 .该方法采用 3个共面的均匀线阵 ,每一均匀线阵对宽带信号空间采样 ,然后进行空时二维DFT变换 ,在空时频率域对宽带信号进行投影变换 ,用MUSIC算法实现宽带来波信号方向余弦的估计 .利用 3个方向余弦估值进行配对 ,然后求得来波的方位角和仰角估计 .该方法既保留了投影算法的优点 ,即不需要源的先验知识 ;不需变换矩阵和在低信噪比有好的性能 ,又避免二维谱峰搜索 .仿真实验表明了算法是有效的 .
A two-dimensional wide-angle signal estimation algorithm based on space-time DFT projection is proposed.The method uses three coplanar uniform linear arrays, each uniform linear array samples the wideband signal space, and then performs two-dimensional space-time DFT transform, The broadband signal is transformed by using the MUSIC algorithm in the space-time frequency domain, and the direction cosine of the broadband signal is estimated by using the MUSIC algorithm.The three-direction cosine estimation is used for pairing, and then the azimuth and elevation estimation of the wave are obtained.This method The advantages of the projection algorithm are retained, that is, no prior knowledge of the source is needed, no transformation matrix is required and good performance at low signal-to-noise ratio is achieved, and two-dimensional peak search is avoided. Simulation results show that the algorithm is effective.