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Satellite navigation systems are widely used in navigation for precise trajectory determination of transport equipment. In this article mathematical models and algorithms have been developed to solve the problems of satellite navigation safety. One of the problems is spoofing (substitution) — a situation in which a system (hardware, software, etc.) successfully masquerades as another by falsifying data system and performs illegal actions. What is considered in the paper is the spoofing detection algorithm based on the analysis of a civil satellite signal generated by the mobile GNSS-singleantenna receivers or dual-antenna. The article also serves to refine the civilian spoofing threat assessment by demonstrating the challenges involved in mounting a spoofing attack. The widespread deployment of GNSS is pushing the current receiver technology to its limits due to the stringent demands for providing seamless, ubiquitous and secure/reliable positioning. This fact is further aggravated by the advent of new applications where the miniaturized size, low power consumption and limited computational capabilities of user terminals pose serious concerns to the implementation of even the most basic GNSS signal processing tasks. This article presents the advantage of Cloud-Based GNSS Navigation, which facilitates the possibility of developing innovative applications where their particularities (e. g. massive processing of data, cooperation among users, security-related applications, etc.) make them suitable for implementation using a cloud-based infrastructure.

Global Navigation Satellite Systems Attacks and a Cloud-based Spoofing Detection for Unmanned Ships