Matches in DBpedia 2016-04 for { <http://dbpedia.org/resource/Iridium_satellite_constellation> ?p ?o }
- Iridium_satellite_constellation abstract "The Iridium satellite constellation is a satellite constellation providing voice and data coverage to satellite phones, pagers and integrated transceivers over the Earth's entire surface. Iridium Communications owns and operates the constellation and sells equipment and access to its services. It was originally conceived by Bary Bertiger, Dr. Ray Leopold and Ken Peterson in late 1987 (and protected by patents by Motorola in their names in 1988) and then developed by Motorola on a fixed-price contract from July 29, 1993 to November 1, 1998 when the system became operational and commercially available.The constellation consists of 66 active satellites in orbit, and additional spare satellites to serve in case of failure. Satellites are in low Earth orbit at a height of approximately 485 mi (781 km) and inclination of 86.4°. Orbital velocity of the satellites is approximately 17,000 mph (27,000 km/h). Satellites communicate with neighboring satellites via Ka band inter-satellite links. Each satellite can have four inter-satellite links: two to neighbors fore and aft in the same orbital plane, and two to satellites in neighboring planes to either side. The satellites orbit from pole to pole with an orbit of roughly 100 minutes. This design means that there is excellent satellite visibility and service coverage even at the North and South poles. The over-the-pole orbital design produces \"seams\" where satellites in counter-rotating planes next to one another are traveling in opposite directions. Cross-seam inter-satellite link hand-offs would have to happen very rapidly and cope with large Doppler shifts; therefore, Iridium supports inter-satellite links only between satellites orbiting in the same direction. The constellation of 66 active satellites has 6 orbital planes spaced 30 degrees apart, with 11 satellites in each plane (not counting spares). The original concept was to have 77 satellites, which is where the name Iridium came from, being the element with the atomic number 77 and the satellites evoking the Bohr model image of electrons orbiting around the Earth as its nucleus. This reduced set of 6 planes is sufficient to cover the entire Earth's surface at every moment.Because of the shape of the Iridium satellites' reflective antennas, the satellites focus sunlight on a small area of the Earth's surface in an incidental manner. This results in an effect called Iridium flares, where the satellite momentarily appears as one of the brightest objects in the night sky and can even be seen during daylight.".
- Iridium_satellite_constellation thumbnail Iridium_Satellite.jpg?width=300.
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- Iridium_satellite_constellation wikiPageWikiLink Category:Satellite_telephony.
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- Iridium_satellite_constellation wikiPageWikiLinkText "IRIDIUM".
- Iridium_satellite_constellation wikiPageWikiLinkText "Iridium 1".
- Iridium_satellite_constellation wikiPageWikiLinkText "Iridium 10".
- Iridium_satellite_constellation wikiPageWikiLinkText "Iridium 11".
- Iridium_satellite_constellation wikiPageWikiLinkText "Iridium 12".
- Iridium_satellite_constellation wikiPageWikiLinkText "Iridium 13".
- Iridium_satellite_constellation wikiPageWikiLinkText "Iridium 14".
- Iridium_satellite_constellation wikiPageWikiLinkText "Iridium 15".
- Iridium_satellite_constellation wikiPageWikiLinkText "Iridium 16".
- Iridium_satellite_constellation wikiPageWikiLinkText "Iridium 17".
- Iridium_satellite_constellation wikiPageWikiLinkText "Iridium 18".
- Iridium_satellite_constellation wikiPageWikiLinkText "Iridium 19".
- Iridium_satellite_constellation wikiPageWikiLinkText "Iridium 20".
- Iridium_satellite_constellation wikiPageWikiLinkText "Iridium 21".
- Iridium_satellite_constellation wikiPageWikiLinkText "Iridium 22".
- Iridium_satellite_constellation wikiPageWikiLinkText "Iridium 23".
- Iridium_satellite_constellation wikiPageWikiLinkText "Iridium 24".
- Iridium_satellite_constellation wikiPageWikiLinkText "Iridium 25".
- Iridium_satellite_constellation wikiPageWikiLinkText "Iridium 26".
- Iridium_satellite_constellation wikiPageWikiLinkText "Iridium 27".
- Iridium_satellite_constellation wikiPageWikiLinkText "Iridium 28".
- Iridium_satellite_constellation wikiPageWikiLinkText "Iridium 29".
- Iridium_satellite_constellation wikiPageWikiLinkText "Iridium 30".
- Iridium_satellite_constellation wikiPageWikiLinkText "Iridium 31".
- Iridium_satellite_constellation wikiPageWikiLinkText "Iridium 32".
- Iridium_satellite_constellation wikiPageWikiLinkText "Iridium 34".
- Iridium_satellite_constellation wikiPageWikiLinkText "Iridium 35".
- Iridium_satellite_constellation wikiPageWikiLinkText "Iridium 36".
- Iridium_satellite_constellation wikiPageWikiLinkText "Iridium 37".
- Iridium_satellite_constellation wikiPageWikiLinkText "Iridium 38".
- Iridium_satellite_constellation wikiPageWikiLinkText "Iridium 39".
- Iridium_satellite_constellation wikiPageWikiLinkText "Iridium 4".
- Iridium_satellite_constellation wikiPageWikiLinkText "Iridium 40".
- Iridium_satellite_constellation wikiPageWikiLinkText "Iridium 41".
- Iridium_satellite_constellation wikiPageWikiLinkText "Iridium 42".
- Iridium_satellite_constellation wikiPageWikiLinkText "Iridium 43".
- Iridium_satellite_constellation wikiPageWikiLinkText "Iridium 44".
- Iridium_satellite_constellation wikiPageWikiLinkText "Iridium 45".
- Iridium_satellite_constellation wikiPageWikiLinkText "Iridium 46".
- Iridium_satellite_constellation wikiPageWikiLinkText "Iridium 47".