A comparative study of mode-space transform and array interpolation for DOA estimation of coherent signals in fourth-order cumulant domain

摘要

This paper focuses on the Direction of Arrival (DOA) estimation of coherent signals based on a Uniform Circular Array (UCA) in the fourth-order cumulant Domain. The mode-space transform and array interpolation transform, which both can transform the raw data received by a UCA into a virtual Uniform Linear Array (ULA) model, are used as a preprocessing technique in a comparative way. Using two virtual ULA models given by these two preprocessing methods, we construct a fourth-order cumulant matrix, together with the well-known spatial smoothing, to obtain two DOA estimators for coherent signals. The performance comparison of the two DOA estimators are done by some theoretical analysis and simulations.