Robust mixed-order root-MUSIC

Several typical situations unfavorable for second-order direction-finding m ethods are known to be easily overcome by means of higher-order techniques. In turn, in typical situations unfavorable for higher-order methods, secon d-order algorithms often perform quite well. Therefore, appropriately combi ning covariance- and cumulant-based techniques into one scheme, it is possi ble to obtain an algorithm with an improved robustness. In this paper, we p ropose two modifications of such combined methods, referred to as mixed-ord er root-MUSIC.