Extended Aperture DOA Matrix Method for High Accurate 2D Direction Estimation
基于扩展孔径波达方向矩阵法的高精度二维DOA估计

This paper proposes a new high accurate azimuth and elevation angle estimation algorithm using DOA matrix method to avoid the ambiguous of extended aperture. The algorithm uses 4array elements to form two-parallel-shape array geometry, high-variance unambiguous direction cosine estimates and low-variance cyclically ambiguous direction cosine estimates are obtained from the different sensors space. The key idea underlying of this algorithm is to use the high-variance unambiguous direction cosine estimates to resolve the low-variance cyclically ambiguous direction cosine estimates to extract azimuth-elevation angle estimates. The proposed algorithm requires no pair matching procedure and 2D iterative searching, and thereby, offering high estimation precision with low computational complexity. The simulation results indicate the performance of proposed algorithm.