Direction finding with uniform circular arrays via phase mode excitation and beamspace root-MUSIC

Beamspace root-MUSIC is a computationally efficient, beamspace implementation of root-MUSIC developed recently for use in conjunction with a uniform linear array. Using B real-valued beams having all but B-1 nulls in common, the major computations in beamspace root-MUSIC are a B×B real-valued eigenvalue decomposition and the rooting of a polynomial of order B -1. Recently, beamspace root-MUSIC was adapted for use in conjunction with a uniform circular array (UCA) using the interpolated array concept of Friedlander. An alternative means of using beamspace root-MUSIC with a UCA based on the concept of phase mode excitation is developed