Two-Dimensional Angles Estimation of Wide-Band Signals with Spatial-Temporal DFT Projection

A new method of estimation two-dimensional angles of wide-band arrival signals is presented with spatial-temporal DFT projection. The sensor array is consisted of three coplanar uniform linear arrays (ULA). For every ULA, the wide-band signals are sampled in spatial and temporal, then 2-D discrete Fourier transform is carried out. A projection operation on 2-D representation of wide-band signals is applied in the spatial-temporal frequency domain. The direction cosine relative to the ULA axes is estimated by MUSIC algorithm. Using the direction cosines relative to three ULA axes, the correct pair is obtained, then the azimuth and elevation are estimated. The method has the advantages of projection method that does not require any a prior information about sources and does not require transformation matrices and has good performance at low SNR, and does not require 2-D spectrum searching. Simulation experimental results are presented demonstrating the capabilities of the method.