DOA Estimation and Mutual Coupling Self-calibration Algorithm for Circular Array

Mutual coupling can make most of high resolution DOA algorithm failure.A DOA estimation and self-calibration algorithm was presented for circular array under the condition of mutual coupling.The proposed algorithm utilized special mutual coupling characteristic of circular array to decouple the signal source information and coupling coefficients of antenna array and constructed cost function to estimate DOA,then took the advantages of DOA to estimate information of mutual coupling,so that two kinds of parameter estimations could be realized without any calibration sources and information of mutual coupling.Theoretical analysis and simulation results demonstrated that the proposed algorithm was of high accuracy and little computation.