An Effective Technique for Enhancing Direction Finding Performance of Virtual Arrays

Table 1

Comparison of the two methods.

	Notion of DOA RMSE reduction	Computational complexity of mapping matrix	Additional prior information compared to [8]
Array interpolation of [17]	Rotate the mapping errors and noise subspace into optimal directions relative to a certain gradient of the DOA estimator criterion function		Complex gradient of criterion of the used estimator
Proposed method	Project the transformation matrix on the real array covariance matrix to strengthen thesignal subspace		None