Robust DOA Estimation of Incoherently Distributed Sources Considering Mixed Circular and Noncircular Signals in Impulsive Noise

In this letter, we propose a robust direction of arrival (DOA) estimation method for mixed circular and noncircular incoherently distributed (ID) sources in impulsive noise. This approach incorporates an outlier-robust extended bounded nonlinear covariance to alleviate the impact of impulsive noise, and we demonstrate its applicability for DOA estimation of ID sources. Subsequently, we determine the DOAs and angular spreads of mixed circular and noncircular ID sources in a closed form via array shift invariance. Numerical simulations illustrate that our proposed method outperforms alternatives in terms of both effectiveness and robustness.