The subject of this article is to answer the question: how does the value of the pseudorange correction change over time in the EGNOS system. The study performed analyses of the pseudorange correction value trends for individual satellites. EGNOS data for the analyses were downloaded from the EMS (EGNOS Message Server) website, while the observation file was obtained from the ASG-EUPOS reference station in Olsztyn. The EGNOS system was characterized, and the structure of the EMS file was presented. In the next stage, the data were decoded using the RTKLIB software, and comparisons of values for individual satellites were performed. The distribution of the pseudorange correction values over time was characterized.GPS and GLONASS systems are satellite navigation systems. They are part of the global civil navigation system, referred to as the Global Navigation Satellite System (GNSS). The main assumption of the system is to ensure the continuity of satellite signal supply to users by multiplying information sources. The increasing number of navigation systems enables the monitoring of signal quality used during maritime, land, and air navigation. For a system to be considered fully navigational, specific requirements must be met, such as: signal continuity, accuracy, and reliability. The operation of the GNSS navigation system is supported by the launch of Satellite Based Augmentation Systems (SBAS). The idea of navigation is the ability to reach a destination safely. Safety during travel is increased through the use of the EGNOS system, within which the Safety-of-Life service has been open since March 2, 2011. In SBAS satellite systems, corrections for GPS receivers are transmitted via satellites. (…)
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Source: Logistyka Magazine 6/2011