Abstract
Global Navigation Satellite System (GNSS) has become an integral part of air navigation. Delay of the GNSS signal in ionospheric layer is one of the most serious problems in using GNSS. Not only accuracy but also the safety is very important in air navigation, and for that reason the augmentation of basic GNSS is used to meet higher requirements of aviation industry. This paper discusses Satellite-Based Augmentation System (SBAS) avionics with special emphasis on correction of signal delay in ionospheric layer as one of the most significant error fixes and compares it with other GNSS based on-board equipment - with basic GNSS (GPS) in terms of accuracy and with Ground-Based Augmentation System (GBAS) generally. This article should therefore show reader the differences between the methods of calculating ionospheric corrections by SBAS and GBAS and explain the reasons of these methods, taking into account the area of intended use of both systems.
Highlights
Satellite-Based Augmentation System, hereinafter SBAS, is system designed to augment the navigation system constellations by broadcasting additional signals from geostationary (GEO) satellites and thereby provides incomparably more accurate position information basic Global Navigation Satellite System (GNSS)
As a result of the benefits provided by SBAS, it was implemented in other parts of the world, for example European continent is covered by EGNOS service
The basic scheme of ground segment is a set of monitoring stations to receive GPS signals that will be processed in order to obtain some estimations of errors that are applicable to the users
Summary
Satellite-Based Augmentation System, hereinafter SBAS, is system designed to augment the navigation system constellations by broadcasting additional signals from geostationary (GEO) satellites and thereby provides incomparably more accurate position information basic GNSS. SBAS architecture consists of ground segment, space segment and user segment. The basic scheme of ground segment is a set of monitoring stations (at very well-known position) to receive GPS signals that will be processed in order to obtain some estimations of errors that are applicable to the users. Once these estimations have been computed, they are transmitted in the form of differential corrections by means of a GEO satellite - space segment to the user. SBAS receiver, which is the part of aircraft avionics.[1][2]
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