Analysis of spatial smoothing with uniform circular arrays

In this correspondence, we analyze spatial smoothing with uniform circular arrays (UCA's). In particular, we study the performance of the Root-MUSIC w ith smoothing in the presence of correlated sources, finite data perturbati ons, and errors in transformed steering vector that arise due to some appro ximations made while extending the Root-MUSIC and smoothing to UCA. Express ions are derived for the asymptotic performance of the Root-MUSIC with smoo thing applied to the transformed UCA data. An attempt has been made to brin g out the impact of both the forward and forward-backward smoothing. We con sider UCA's with isotropic as well as directional sensors in our study. Com puter simulations are provided to demonstrate the usefulness of the analysi s.