A Computationally Efficient Algorithm for DOA Estimation with Unfolded Coprime Linear Array

Algorithm 1

The details of the proposed ISF algorithm.

	Step 1: compute the covariance matrix according to equation (2)
	Step 2: operate the EVD of and get the signal subspace by equation (3)
	Step 3: via propagator method, obtain the initial angle estimation and recover all the DOA estimates by equations (33) and (34)
	Step 4: ambiguity problem is solved via the coprime property and initial estimates are achieved
	Step 5: compute fine DOA estimates according to equation (52)