An Accurate Reduced-Order Polynomial Solution for Root-MUSIC Source Localization Using Displaced Sensor Arrays

摘要

This paper proposes a modified Root-MUSIC direction finding algorithm for source localization using a displaced sensor array (DSA) configuration which utilizes two parallely-displaced arrays in the vertical plane. It is shown that the proposed configuration utilizes the spatial displacement of array sensors in both the horizontal and azimuth directions together with the symmetry of the two parallel arrays in order to reduce the rank of the spatial covariance matrix. This results in a reduced-order Root-MUSIC polynomial for which the complex roots correspond to the desired directions of the radiating sources to be localized. Simulation results show that the developed algorithm outperforms the standard Root-MUSIC algorithm for conventional uniform linear arrays (ULAs) in terms of computational efficiency, numerical accuracy, and angular resolution.