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The problem of vessel collisions or near-collision situations on sea, often caused by human error due to incomplete or overwhelming information, is becoming more and more important with rising maritime traffic. Approaches to supply navigators and Vessel Traffic Services with expert knowledge and suggest trajectories for all vessels to avoid collisions, are often aimed at situations where a single planner guides all vessels with perfect information. In contrast, we suggest a two-part procedure which plans trajectories using a specialised A* and negotiates trajectories until a solution is found, which is acceptable for all vessels. The solution obeys collision avoidance rules, includes a dynamic model of all vessels and negotiates trajectories to optimise globally without a global planner and extensive information disclosure. The procedure combines all components necessary to solve a multi-vessel encounter and is tested currently in simulation and on several test beds. The first results show a fast converging optimisation process which after a few negotiation rounds already produce feasible, collision free trajectories.
Tourist tracking
(2015)
Regarding moral concerns in the business sphere, integrity is often mentioned as one of the core values that guides the behavior of companies. Daimler for instance states: “Acting with integrity is the central requirement for sustainable success and a maxim that Daimler follows in its worldwide business practices.”1 Reference to integrity is mostly supposed to signal that the company acts morally responsibly. Although some companies specify what acting with integrity means for them, it generally remains unclear what the concept of integrity entails – both broadly speaking and referring to business. This conceptual gap shall be filled by developing a concept of integrity that can be transferred to the business context. For this purpose, the main criteria that constitute moral integrity will be discussed before reflecting on how these could be integrated into a practical and comprehensive concept of corporate integrity.
Small vessels or unmanned surface vehicles only have a limited amount of space and energy available. If these vessels require an active sensing collision avoidance system it is often not possible to mount large sensor systems like X-Band radars. Thus, in this paper an energy efficient automotive radar and a laser range sensor are evaluated for tracking surrounding vessels. For these targets, those type of sensors typically generate more than one detection per scan. Therefore, an extended target tracking problem has to be solved to estimate state end extension of the vessels. In this paper, an extended version of the probabilistic data association filter that uses random matrices is applied. The performance of the tracking system using either radar or laser range data is demonstrated in real experiments.