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针对宽带多相干组信号条件下传统的聚焦类算法性能下降的问题,提出一种基于空间斜投影的宽带波达方向(DOA)估计算法。该算法首先利用窄带解相干算法得到初始的DOA估计值,接着通过求解约束最小化问题得到各相干组信号的衰落系数估计值;然后,利用空间斜投影技术将不同的相干组信号分离,并利用聚焦变换将分离的信号聚焦到单一频点处;最后,利用窄带高分辨算法得到最终的DOA估计值。仿真实验表明:与现有的聚焦类算法相比,文中算法具有更好的估计性能,在较低信噪比情况下尤为明显;同时,文中方法对于相关性较低的空间色噪声也有一定适用性。
Aiming at the problem of performance degradation of traditional focusing algorithms in wideband coherent group signals, a DOA estimation algorithm based on spatial oblique projection is proposed. Firstly, the algorithm obtains the initial DOA estimation value by using the narrow-band de-coherence algorithm and then obtains the estimated fading coefficient of each coherent group by solving the constrained minimization problem. Secondly, the signals of different coherent groups are separated by spatial oblique projection technique, Focused transform focuses the separated signal to a single frequency point. Finally, the final DOA estimate is obtained using a narrow-band, high-resolution algorithm. The simulation results show that the proposed algorithm has better estimation performance compared with the existing focus class algorithms, especially at lower signal-to-noise ratio. Meanwhile, the proposed method is also applicable to the spatial color noise with low correlation Sex.