Sammendrag
This paper describes how different motion sensors can be integrated and fused to obtain necessary navigational requirements needed for autonomous operations. Both autonomous coastal navigation and automatic docking operations are analysed with respect to trade-offs in position and velocity accuracies, integrity, availability and continuity. By using AIS measurements from typical docking operations for the Norwegian coastal express vessels it is possible to define feasible safe trajectories for the docking operations. Justified requirements can be obtained using closed-loop analysis for the specific vessel and its operation. Both vessel and passenger safety can be related to vessels horizontal velocity and the safe velocity concept has been introduced to derive requirements for integrity, availability, alarm limit and continuity in case of unreported/unhandled errors in the navigation system. The outcome of this study is a design tool, or a generic methodology for selecting the most promising combination of the integrated sensor components to obtain necessary navigation system performance for safe autonomous navigation.
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