A two-dimensional (2D) direction-of-arrival (DOA) estimation method for coherently distributed sources has been proposed in highly real-time situation using only one snapshot. Ulizing two uniform linear arrays (ULAs), the proposed algorithm firstly construct four equivalent matrices with rotational structures using one snapshot, and then a total equivalent covariance is extended by the four matrices..Finally, two rotational invariance matrices can been calculate by ESPRIT-like algorithm, and
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