Computationally efficient DOA estimation using sparse arrays with I/Q mismatch and D.C. offsets

Abstract

Computationally efficient methods for accurate, bias free DOA estimation from a source signal impinging on a sparse array are presented. In particular, the presence of I/Q mismatch and D.C. offsets are discussed. Since the methods meet Cramer-Rao bounds and able to cope array imperfections such as nonuniform gains, element failure, they are useful in short sparse array implementations with simplified processing hardware.