New 2D-DOA and Angular Spread Estimation method for Coherently Distributed Sources

In many two-dimensional Direction of Arrival estimation approaches for Coherently distributed source, the computational complexity induced by high-dimensional peakfinding searching is normally highly demanding. We propose a low-complexity estimation algorithm by using the approximation to the steering to vector for small angular extensions, which estimates the nominal DOA using the phase information of the estimated invariance structured diagonal matrix. Then angular spread can be estimated form the module of the steering responses with the angular weighting function of CD sources. The proposed algorithm provides a good estimation performance while requiring low complexity and it can be use any array without restrictions. In addition, this algorithm can obtain the nominal DOA without the priori knowledge of the distribution type. The efficiency of the algorithm is validated by computer simulations. Keywords-Coherently distributed source; DOA; Angular spread; Cumulants