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- Advanced_Extremely_High_Frequency abstract "Advanced Extremely High Frequency (AEHF) is a series of communications satellites operated by the United States Air Force Air Force Space Command. The spacecraft 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 spacecraft in geostationary orbits, of which three 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 spacecraft use a large number of narrow spot beams directed towards the Earth to relay communications to and from users. Crosslinks between the satellites will allow them to relay communications directly without the need to relay them to a ground station first. The satellites are designed to provide jam-resistant communications with a low probability of interception, and incorporate frequency-hopping. The spacecraft are equipped with 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[citation needed] 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.".
- Advanced_Extremely_High_Frequency thumbnail AEHF_1.jpg?width=300.
- Advanced_Extremely_High_Frequency wikiPageExternalLink nasatechAEHF1.html.
- Advanced_Extremely_High_Frequency wikiPageExternalLink ntAEHF-2_PAGE.html.
- Advanced_Extremely_High_Frequency wikiPageExternalLink ntAEHF-3_PAGE.html.
- Advanced_Extremely_High_Frequency wikiPageID "13236983".
- Advanced_Extremely_High_Frequency wikiPageRevisionID "585867068".
- Advanced_Extremely_High_Frequency applications "Military communications".
- Advanced_Extremely_High_Frequency built "3".
- Advanced_Extremely_High_Frequency bus Lockheed_Martin_A2100.
- Advanced_Extremely_High_Frequency caption "Artist's impression of an AEHF spacecraft".
- Advanced_Extremely_High_Frequency country United_States.
- Advanced_Extremely_High_Frequency first "USA-214, 2010-08-14".
- Advanced_Extremely_High_Frequency hasPhotoCollection Advanced_Extremely_High_Frequency.
- Advanced_Extremely_High_Frequency launched "3".
- Advanced_Extremely_High_Frequency lifetime "4.418064E8".
- Advanced_Extremely_High_Frequency manufacturer Lockheed_Martin.
- Advanced_Extremely_High_Frequency manufacturer Northrop_Grumman.
- Advanced_Extremely_High_Frequency mass "6168".
- Advanced_Extremely_High_Frequency name "Advanced Extremely High Frequency".
- Advanced_Extremely_High_Frequency operational "0".
- Advanced_Extremely_High_Frequency operator United_States_Air_Force.
- Advanced_Extremely_High_Frequency orbits Geosynchronous_orbit.
- Advanced_Extremely_High_Frequency orders "3".
- Advanced_Extremely_High_Frequency status "Active".
- Advanced_Extremely_High_Frequency status "In production".
- Advanced_Extremely_High_Frequency subject Category:Communications_satellites.
- Advanced_Extremely_High_Frequency subject Category:Military_communications.
- Advanced_Extremely_High_Frequency comment "Advanced Extremely High Frequency (AEHF) is a series of communications satellites operated by the United States Air Force Air Force Space Command. The spacecraft 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 spacecraft in geostationary orbits, of which three have been launched.".
- Advanced_Extremely_High_Frequency label "Advanced Extremely High Frequency".
- Advanced_Extremely_High_Frequency label "Advanced Extremely High Frequency".
- Advanced_Extremely_High_Frequency label "Advanced Extremely High Frequency".
- Advanced_Extremely_High_Frequency label "先進EHF通信衛星".
- Advanced_Extremely_High_Frequency sameAs Advanced_Extremely_High_Frequency.
- Advanced_Extremely_High_Frequency sameAs Advanced_Extremely_High_Frequency.
- Advanced_Extremely_High_Frequency sameAs 先進EHF通信衛星.
- Advanced_Extremely_High_Frequency sameAs m.03bztw5.
- Advanced_Extremely_High_Frequency sameAs Q379544.
- Advanced_Extremely_High_Frequency sameAs Q379544.
- Advanced_Extremely_High_Frequency wasDerivedFrom Advanced_Extremely_High_Frequency?oldid=585867068.
- Advanced_Extremely_High_Frequency depiction AEHF_1.jpg.
- Advanced_Extremely_High_Frequency isPrimaryTopicOf Advanced_Extremely_High_Frequency.
