Two-dimensional angles estimation of wide-band signals with spatial-temporal DFT projection

A new method for estimating two-dimensional angles of wide-band arrival signals was presented with spatial-temporal DFT projection. The sensor array consists of three coplanar uniform linear arrays (ULA). For every ULA, the wide-band signals are sampled in spatial and temporal, and 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 preserves the advantages of projection method: it does not require any prior information about sources; it does not use transformation matrices; it has good performance at low SNR, (signal-to-noise ratio); it need not perform 2-D spectrum searching. Simulation results were presented