Low-complexity DOA estimation method for a co-prime linear array

The problem of direction‐of‐arrival (DOA) estimation for a co‐prime linear array is researched. A low‐complexity DOA estimation method is proposed. The co‐prime array is decomposed into two sparse uniform linear sub‐arrays whose inter‐element spacing meets the co‐prime condition. Then the received signals of the two sub‐arrays are processed for statistical signal processing. Although the DOA estimation based on the under‐sampled signal will produce phase ambiguity, the sparse array element spacing that satisfies the co‐prime condition makes the phase ambiguity have certain periodic rules. Finally, the unique solution corresponding to the true DOA can be obtained in the phase ambiguities of the two sub‐arrays through the application of the co‐prime nature. Simulation results validate the effectiveness of the proposed method.

Abstract licence: CC BY-NC-ND

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