1. Miroslava Trojanovičová

2.  The European Geostationary Navigation Overlay Service  The official start of operations- on 1 October 2009  3 satellites- AOR-E (PRN120), IOR-W (PRN 126) and (PRN 124)  signal-in-space is broadcast by Geostationary Earth Orbit (GEO) satellites in the L1 frequency, centered at 1575.42 MHz.  More than 40 ground stations

3.  The Wide Area Augmentation System  Space segments- multiple geosynchronous communication satellites(Inmarsat-4 F3, Telesat's Anik F1R, and Intelsat's Galaxy 15)  Ground segments- 38 Wide-area Reference Stations (WRS), 3 WAAS Master Station (WMS), 6 Ground Uplink Stations (GUS), 2 Operational Control Centers (OCC)  The user segment is the GPS and WAAS receiver  Provides ranging signals transmitted by GEO satellites

4.  Multi-functional Satellite Augmentation System  Space segment contain two satellites: MTSAT-1R and MTSAT-2  The MSAS Ground Segment is composed of four Ground Monitor Station (GMS) that collect information on the GPS and MTSAT signals  The MSAS user segment is the GPS and SBAS- enabled receiver

5.  VHF omnidirectional radio range  short-range radio navigation system for aircraft, enabling aircraft to determine their position  VOR stations broadcast a VHF radio composite signal  A VOR ground station sends out a master signal, and a highly directional second signal that varies in phase 30 times a second compared to the master.  The identifier is typically a two- or three- letter string in Morse code.

6.  Distance measuring equipment  Aircraft use DME to determine their distance from a land-based transponder by sending and receiving pulse pairs  The ground stations are typically co-located with VORs