NAVIGATIONAL USE OF THE E-LORAN SYSTEM IN MODIFICATION WITH THE SPLINE FUNCTIONS METHOD

The issue of navigational use of E-LORAN as an alternative to GPS is considered. It is noted that when using the spline algorithms, there is a real possibility to automate the accelerated handling of navigation information in the electronic LORAN project on the standard base of onboard computer resources. The proposed approach becomes especially important in case of blocking access to GPS for marine civilian users in local military conflicts or in case of technical problems such as spoofing attacks, satellite signal jamming, or hostile ship control. System protection of the marine consumer from unauthorized simulated interference with GPS signals is an actual problem of cybernetic security of the navigation in the future when assessing the hacker impact on the target task of safely following the planned route for any marine mobile object. Since LORAN/E-LORAN is hyperbolic navigation system, the task of interpolating the classical hyperbola is performed in order to demonstrate the productivity of the developed algorithms. On the basis of a specially organized calculated experiment, the high accuracy of synthesizing the navigation isoline is proved. A sequence of four screenshots demonstrates the reliability of the obtained results of algorithmic functionality. Repurposing the proposed approach to the differential navigation mode allows us to directly use the grid of distorted hyperboles in practical applications, while conceptually ignoring the complexity of mathematical formalization of fictitious isolines. A retrospective algorithm in software implementation based on the least squares method for calculating the most probable coordinates of the ship position as an iterative search for the intersection point of spline hyperbolic isolines with a geometric interpretation of the assigned task solution is used in the paper. When navigational using of E-LORAN in a modification with spline functions, it becomes possible to abandon specialized electronic or traditional paper charts with the hyperbolic family, applying spline algorithmic and onboard software in order to eliminate the navigator participation in traditional interpolation on a hyperbolic grid-chart in order to fix the vessel position. It is concluded that the specific considered aspect of the spline functions method can be a stimulating factor for automated accelerated processing of navigation information.

Spoofing-attack, satellite signal jamming, hostile ship control, cybernetic navigation security, assessment of the hacker impact, fictitious distorted isoline

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