A Novel Wideband DOA Estimation Method via Decorrelation Approach for Coherent Signals.

In this paper, we proposed a new DOA estimation method for wideband coherent signals. First, the signal reaching on the array is broken down into some narrowband signals, and the covariance matrix is calculated at each frequency bin. Then, a Toeplitz matrix reconstruction approach is formed to reduce the correlation between the signals. Based on this matrix, the focusing matrix is calculated and the signal information is transmitted from different narrow-frequency bins to the central frequency. Finally, the DOA estimation is done by solving a cost function in the form of narrowband processing. This method does not require any initial DOA estimation and also does not need any repeating process. The simulation results show the superior performance of the proposed method compared to the other popular methods especially in the cases of coherent scenarios, low signal to noise ratio (SNR), and spatially-closed sources. This method has great potential for practical applications in radar, sonar, and wireless communication systems.

کلیدواژه ها:

Direction of arrival (DOA) ، Singular Value Decomposition (SVD) ، WAVES ، Signal Subspace Focusing (SSF)