A method of being modified 2-D DOA estimation is presented.By reconstructing covariance matrix of the received array data

the correlativity of the incident signals is decreased

and mis-division between signal subspace and noise subspace is controlled

therefore the number of estimated signals would be equal to the number of actual incident signals.This method has good performance not only for DOA estimation of the correlation signals

but for DOA estimation of the non-correlation signals.In addition the computational complexity will not increase obviously.The simulation tests verify the validity of the presented algorithm.