Detection of self navigational aids on radar image using ideas from immune systems
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The problem of continuous position availability is one of the most important issues connected with human activity at sea. Because the availability of satellite navigational systems can be limited in some cases, for example during military operations, we should consider additional methods of acquiring information about ship's position. One of the solutions, which can serve to this purpose, is the method consisting in approximating a position based on a vector of bearings and distances to a set of previously selected navigational aids (superbuoys). Navigational radar is used to fix bearing and distance to every superbuoy, which constitutes an element of the positioning system. The problem is only to distinguish radar echoes of self superbuoys i.e. superbuoys that belong to the system from echoes of other objects. The method proposed in the article can be a solution of this problem. It is an adaptation of r-contiguous-bits scheme borrowed from immune systems. It compares coastlines visible on the radar image from every point suspected to be an echo of the element of the system and pattern coastlines generated from a chart and corresponding to actual components of the system.
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