Matches in DBpedia 2016-04 for { <http://wikidata.dbpedia.org/resource/Q379544> ?p ?o }
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- Q379544 subject Q15306628.
- Q379544 subject Q5914922.
- Q379544 subject Q6392438.
- Q379544 subject Q6492471.
- Q379544 subject Q8398197.
- Q379544 subject Q8629252.
- Q379544 abstract "Advanced Extremely High Frequency (AEHF) is a series of communications satellites operated by the United States Air Force Space Command. They will be used to relay secure communications for the Armed Forces of the United States, the British Armed Forces, the Canadian Forces and the Royal Netherlands Armed Forces. The system will consist of six satellites in geostationary orbits, three of which have been launched. AEHF will replace the older Milstar system and will operate at 44 GHz Uplink (EHF band) and 20 GHz Downlink (SHF band).AEHF satellites use a large number of narrow spot beams directed towards the Earth to relay communications to and from users. Crosslinks between the satellites allow them to relay communications directly rather than via a ground station. The satellites are designed to provide jam-resistant communications with a low probability of interception. They incorporate frequency-hopping radio technology, as well as phased array antennas that can adapt their radiation patterns in order to block out potential sources of jamming.AEHF incorporates the existing Milstar low data-rate and medium data-rate signals, providing 75–2400 bit/s and 4.8 kbit/sec–1.544 Mbit/s respectively. It also incorporates a new signal, allowing data rates of up to 8.192 Mbit/s. When complete, the space segment of the AEHF system will consist of six satellites, which will provide coverage of the surface of the Earth between latitudes of 65 degrees north and 65 degrees south.The initial contract for the design and development of the AEHF satellites was awarded to Lockheed Martin Space Systems and Northrop Grumman Space Technology in November 2001, and covered the System Development and Demonstration phase of the program. The contract covered the construction and launch of three satellites, and the construction of a mission control segment. The contract was managed by the MILSATCOM Program Office of the United States Air Force Space and Missile Systems Center. Like the Milstar system, AEHF will be operated by the 4th Space Operations Squadron, located at Schriever Air Force Base.".
- Q379544 thumbnail AEHF_1.jpg?width=300.
- Q379544 wikiPageExternalLink nasatechAEHF1.html.
- Q379544 wikiPageExternalLink ntAEHF-2_PAGE.html.
- Q379544 wikiPageExternalLink ntAEHF-3_PAGE.html.
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- Q379544 wikiPageWikiLink Q6392438.
- Q379544 wikiPageWikiLink Q644943.
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- Q379544 wikiPageWikiLink Q6492471.
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- Q379544 wikiPageWikiLink Q7240.
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- Q379544 wikiPageWikiLink Q83481.
- Q379544 wikiPageWikiLink Q8398197.
- Q379544 wikiPageWikiLink Q8629252.
- Q379544 comment "Advanced Extremely High Frequency (AEHF) is a series of communications satellites operated by the United States Air Force Space Command. They will be used to relay secure communications for the Armed Forces of the United States, the British Armed Forces, the Canadian Forces and the Royal Netherlands Armed Forces. The system will consist of six satellites in geostationary orbits, three of which have been launched.".
- Q379544 label "Advanced Extremely High Frequency".
- Q379544 depiction AEHF_1.jpg.