Satellites
Similar to WAAS, EGNOS is mostly designed for aviation users which enjoy unperturbed reception of direct signals from geostationary satellites up to very high latitudes. The use of EGNOS on the ground, especially in urban areas, is limited due to relatively low elevation of geostationary satellites: about 30° above horizon in central Europe and much less in the North of Europe. To address this problem, ESA released in 2002 SISNeT, an Internet service designed for continuous delivery of EGNOS signals to ground users. The first experimental SISNeT receiver was created by the Finnish Geodetic Institute. The commercial SISNeT receivers have been developed by Septentrio.
| Satellite Name & Details | NMEA / PRN | Location |
|---|---|---|
| Inmarsat 3-F2 (Atlantic Ocean Region-East) | NMEA #33 / PRN #120 | 15.5°W |
| ARTEMIS | NMEA #37 / PRN #124 | 21.5°E |
| Inmarsat 4-F2 (Europe Middle East Africa) | NMEA #39 / PRN #126 | 25°E |
| Inmarsat 3-F1 (Indian Ocean) | NMEA #44 / PRN #131 | 64.5°E |
| Astra 4B (a.k.a. Sirius 5 or SES-5) | launch in 2012 | 5.0°E |
| Astra 5B | launch in 2013 | 31.5°E |
Read more about this topic: European Geostationary Navigation Overlay Service
Famous quotes containing the word satellites:
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—Jerome Cady, U.S. screenwriter, and Lewis Milestone. Peter Voroshevski (Howard Clinton?)