DOA Estimation of Quasi-Stationary Signals Based on a Separated Generalized Nested Array

This paper proposes a sparse array consisting of two separate generalized nested arrays. The unit element -spacing of each generalized nested array can be adjusted to multiple half -wavelengths of the incident signal. By adjusting the element -spacing, the mutual coupling effect can be greatly reduced. For this array, a direction of arrival (DOA) estimation method of quasi -stationary signals has also been proposed. By using the received signals of the separated generalized nested array, a signal subspace is obtained. Then, this subspace is filled into a higher -order signal subspace to avoid angle ambiguity. Using the higher -order signal subspace, DOAs of all signals can be estimated by spectral peak search. Simulation results show that the proposed separated generalized nested array has better performance than the conventional nested array in DOA estimation.