A New Method for Estimating 2-D DOA in Coherent Source Environment Using Single Snapshot

In order to estimate two-dimensional direction-of-arrival(DOA) of coherent signal sources fast in complex electromagnetic interference environment, the paper reconstructs three data matrixes which use the observed data vector directly and can realize decorrelation in three different dimensions according to the characteristic of three orthogonal linear arrays. Combined with ESPRIT algorithm, the 2-D DOA can be estimated fast. Using one single snapshot, the proposed algorithm doesn't need to calculate covariance matrix. The problem of estimating 2-D DOA can be transformed to three 1-D DOA estimations which can be carried out synchronously, so the algorithm reduces calculation amount and this is helpful to project implementation. The proposed algorithm exists the problem of aperture loss and estimation error caused by one single snapshot. Using the characteristic of noncircular signals and the accumulation of the same phase data, the method can improve the degree of freedom of array and estimation performance. The simulation results show the effectiveness of the proposed algorithm and the countermeasures.