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In this paper, an improved direction-of-arrival (DOA) estimation algorithmfor circular and non-circular signals is proposed. Most state-of-the-artalgorithms only deal with the DOA estimation problem for the maximalnon-circularity rated and circular signals. However, common non-circularityrated signals are not taken into consideration. The proposed algorithm canestimates not only the maximal non-circularity rated and circular signals, butalso the common non-circularity rated signals. Based on the property of thenon-circularity phase and rate, the incident signals can be divided into threetypes as mentioned above, which can be estimated separately. Theinterrelationship among these signals can be reduced significantly, which meansthe resolution performance among different types of signals is improved.Simulation results illustrate the effectiveness of the proposed method.

An Improved DOA Estimation Algorithm for Circular and Non-Circular Signals with High Resolution