This article discusses the basic GPS system complement ground system GBAS (Ground based augmentation system). This next generation instrument landing system is compared with the metric wave instrument landing system (ILS). It is shown that work area of GBAS is larger, ensuring greater accuracy. Aircraft witch use ILS can only approach through linear landing trajectory, but aircraft witch use GBAS can approach through any landing trajectory. In addition, this system is relatively inexpensive, compact, stand-alone and can be installed anywhere in the world, where there are technical possibilities. GBAS is characterized by economy and provides highly accurate navigation information for all airport runways respectfully, as well as the airport approach zone. The installation, maintenance and operating costs are lower. These claims are justified by the author’s collected data comparing it to an ILS. The results reveal that it would be appropriate to install a GBAS system in Vilnius, Kaunas and Šiauliai international airports the coming years. One system ensures not only the landing of aircraft in both directions, but exact approach and the surrounding smaller airports, that do not have an instrument landing system.

Article in Lithuanian