DOA estimation of multiple non-coherent and coherent signals using element transposition of covariance matrix

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Abstract Up to date, investigation of direction of arrival (DOA) gains more effort on multiple signals rather than coherent signals, particularly coherent signals measured by non-uniform and circular arrays — which still remains room for exploration. In this study, a new approach using element transposition of the covariance matrix combined with the MUSIC algorithm was proposed to estimate DOAs of multiple coherent and non-coherent signals by an arbitrary symmetric antenna array. A balanced property of phase differences of the symmetric antenna array was discovered to de-correlate the received signals, and simulation was performed for linear and circular arrays. Here, we established a new method to estimate and distinguish the DOAs of both non-coherent and coherent signals with higher accuracy and resolution than other conventional methods.