New DOA Estimation Method for Wideband Coherent Signals in the Presence of Correlated Noise

Abstract

With a uniform linear antenna array, a new direction-of-arrival (DOA) estimation method is proposed for wideband coherent signals in the presence of unknown correlated noise but with structured covariance matrix. Based on this proposed structure, i.e. Hermitian Toeplitz, a spatial differencing operation that exploits this symmetry is applied to remove the effect of the unknown noise and a new matrix is constructed accordingly at each frequency bin. Following this step, a focusing operation is performed to give the corresponding aligned covariance matrix. Finally, an eigenstructure-based DOA estimation method is applied. The validity of the method is supported by numerical simulation under various conditions.

DOA-Estimation Method Based on Improved Spatial-Smoothing Technique

“…The SNR = 0 dB and the number of snapshots N = 400. The FSS algorithm, FBSS algorithm, IRNSMUSIC [23] algorithm, and the proposed method were used to search the spectral peaks and the spatial spectrum shown in Figure 2 and Figure 3, respectively.…”