Abstract: A new method for frequency and direction of arrival (DOA) estimation using snapshots nearby frequency spectrum peaks is proposed for application in the multichannel system in the presence of unknown sensor gains and phase. A modified single snapshot mode for only one source contributing to a frequency spectrum peak and a weighted subspace projection for multiple sources are proposed, respectively. Without the calculation of the spatial covariance matrix and pairing operation of frequency and direction of arrival, the method is effective for both coherent and incoherent sources scenarios and may be applied in the multichannel system due to the high compress ratio of the 3dB signal bandwidth to the sampling rate. The measured data based on a uniform linear array illustrate the effectiveness for coherent sources and the robustness to gains and phases mismatch and the simulated data based on a plane array verify the higher angle resolution in comparison with the MUSIC algorithm.

Key words: direction of arrival, frequency estimation, coherent source, gains and phases error