Dynamic Positioning of an ROV with Unknown Dynamics and in the Presence of External Disturbances Using Extended-State Observer Dynamic Positioning of an ROV with Unknown Dynamics and in the Presence of External Disturbances Using Extended-State Observer 20th Marine Industries Conference (MIC 2018) Authors : Hosseinnajad, A., Loueipour, M. writer Alireza Hosseinnajad Mehdi Loueipour