Abstract:

A new method of unambiguous direction of arrival (DOA) estimation based on compressed sensing(CS) for wideband reconnaissance receiver is proposed. Making use of the characteristic of under sampling of the nonlinear array in spatial domain and the sparsity of spatial spectrum, the CS model of unambiguous DOA estimation is constructed and the basis pursuit de-noising algorithm is adopted to estimate the response of spatial spectrum without ambiguity. DOA can be estimated unambiguously when the minimum element spacing does not meet Nyquist sampling in spatial domain. A method integrating fast Fourier transform pre-processing in frequency domain and CS algorithm is proposed. The proposed method improves the processing ability for simultaneous multi-signals and performs better robustness against noise. Computer simulations show that the proposed method performs better than the direct CS method with higher precision in DOA estimation and better robustness.