The multiple signal classification (MUSIC) method for
direction-of-arrival (DOA) estimation is widely applied in practical
scenarios. However, the MUSIC method with planar array requires
two-dimensional (2D) on-grid spectrum searches, which would lead to the
grid mismatch and high computational complexity. Therefore, a high
precision fast DOA estimation method for planar array is proposed. In
the proposed method, a two-stage grid search approach over the 2D
spectrum is firstly applied to obtain a quick coarse estimation of DOA.
Then the estimation of higher precision is achieved via a quadratic
surface fitting method. Simulation results verified the effectiveness of
the proposed method.