navigation

We present the concept, architecture, and algorithm of a combined UAV control scheme designed for operation under electronic warfare (EW). The core idea is a ‘silent’ ingress to the task area via a fiber- optic link–carrying command-and-control (C2) and video with no RF emissions–and a return over a protected radio link employing anti-jamming techniques (FHSS/DSSS, narrow-beam antennas, adaptive modulation/coding, power control, AES-GCM cryptography).

In densely populated areas or indoors, the accuracy of GPS signals can be significantly reduced. This is because satellite signals can be obscured by buildings and reflected from them, which creates so- called multi-layer reflections. As a result, the system can incorrectly determine the position, which leads to a significant error. This creates serious problems for indoor navigation, especially if high accuracy is required. Alternative indoor navigation technologies are being actively developed to solve this problem.

In 2022, Galileo, the European GNSS, launched the first phase of its HAS (High Accuracy Service) initiative. With free and global corrections for clock delays and satellite orbits, Galileo HAS provides decimeter positioning accuracy without additional ground networks. This research aims to evaluate the advancements in precise positioning technologies, focusing on the Galileo High Accuracy Service (HAS). The study highlights the importance of precision positioning methods, including Standard Point Positioning (SPP), Real-Time Kinematic (RTK), and Precise Point Positioning (PPP).