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Intelsat 907
Intelsat 907 (or IS-907) was a communications satellite operated by Intelsat. Launch Intelsat 907 was launched by an Ariane 4 rocket from Guiana Space Centre, French Guiana, at 06:44 UTC on February 15, 2003. Capacity and coverage The 4.7 tonne spacecraft provided data-relay among installations in North America, South America, Western Europe and Africa through its array of C band and Ku band transponders after parking over 27.5 degrees west longitude. It replaced the aging Intelsat 605. Replacement On 2 April 2020, the Intelsat 907 was replaced by the Intelsat 901 satellite. Before this, Intelsat 901 had been taken out of operation (having operated for about 18 years in another orbital slot) and moved into graveyard orbit where it docked with Mission Extension Vehicle-1 (MEV-1), a satellite service craft. MEV-1 then took responsibility of propulsion and attitude control of the satellite pair. The satellites then descended back to geostationary arc, where Intelsat 901 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Communications Satellite
A communications satellite is an artificial satellite that relays and amplifies radio telecommunication signals via a transponder; it creates a communication channel between a source transmitter and a receiver at different locations on Earth. Communications satellites are used for television, telephone, radio, internet, and military applications. Many communications satellites are in geostationary orbit above the equator, so that the satellite appears stationary at the same point in the sky; therefore the satellite dish antennas of ground stations can be aimed permanently at that spot and do not have to move to track the satellite. Others form satellite constellations in low Earth orbit, where antennas on the ground have to follow the position of the satellites and switch between satellites frequently. The high frequency radio waves used for telecommunications links travel by line of sight and so are obstructed by the curve of the Earth. The purpose of communications sate ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
C Band (IEEE)
The C band is a designation by the Institute of Electrical and Electronics Engineers (IEEE) for a portion of the electromagnetic spectrum in the microwave range of frequencies ranging from 4.0 to 8.0 gigahertz (GHz). However, the U.S. Federal Communications Commission C band proceeding and auction, designated 3.7–4.2 GHz as C band. The C band is used for many satellite communications transmissions, some Wi-Fi devices, some cordless telephones, as well as some Radar and weather radar systems. Use in satellite communication The communications C band was the first frequency band that was allocated for commercial telecommunications via satellites. The same frequencies were already in use for terrestrial microwave radio relay chains. Nearly all C-band communication satellites use the band of frequencies from 3.7 to 4.2 GHz for their downlinks, and the band of frequencies from 5.925 to 6.425 GHz for their uplinks. Note that by using the band from ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mission Extension Vehicle
A Mission Extension Vehicle (MEV) is a type of spacecraft designed to extend the functional lifetime of another spacecraft through on-orbit satellite servicing. They are 2010s-design small-scale in-space satellite-refueling spacecraft first launched in 2019. The MEV spacecraft grew out of a concept proposed in 2011 by ViviSat, a 50/50 joint venture of aerospace firms US Space and Alliant Techsystems (ATK). The joint venture was created in 2010 for the purpose of designing, producing and operating the MEV program. Since the original conception of the MEV program by the ViviSat company, the Vivisat venture was shut down for a time, and the company was dissolved by Orbital ATK in April 2016. The MEV program continued on as a solo-project of Orbital ATK, which was subsequently purchased by Northrop Grumman in 2018. The MEV program continued under Northrop Grumman and in 2019, launched ''MEV-1'' to dock and reposition Intelsat 901, an objective reached in April 2020. Servicing an o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Intelsat 901
Intelsat 901 (IS-901) was the first of nine new Intelsat satellites launched in June 2001 at 18° West, providing Ku-band spot beam coverage for Europe and C-band coverage for the Atlantic Ocean region. It is capable of selectable split uplink for Satellite news gathering (SNG), tailored for increased communications demands such as DTH and Internet. Satellite Intelsat 901 was launched by an Ariane 4 from the Centre Spatial Guyanais in French Guiana on 9 June 2001 at 06:45 UTC. * Increased power – Intelsat 901 is designed to provide up to 5 dB for downlink EIRP, and up to 1.8 dB for G/T over the Intelsat 7 series satellites. * Increased Capacity – with over 72 C-band, 36 MHz equivalent unit transponders, Intelsat 901 provides a significant increase in capacity over the previous satellite at 18° West. * Improved Coverage – Intelsat 901 provides significantly expanded zone coverage. The Ku-band spot beams also include more areas within each zone. Encounter with Ru ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Intelsat 605
Intelsat 605, previously named Intelsat VI F-5, was a communications satellite operated by Intelsat. Launched in 1991, it was the fourth of five Intelsat VI satellites to be launched. The Intelsat VI series was constructed by Hughes Aircraft, based on the HS-389 satellite bus. Intelsat 605 was launched at 23:15:13 UTC on 14 August 1991, atop an Ariane 4 44L carrier rocket, flight number V45. The launch took place from ELA-2 at Kourou, and placed Intelsat 605 into a geosynchronous transfer orbit. The satellite raised itself into its final geostationary orbit using two liquid-fuelled R-4D-12 engines, with the satellite arriving in geostationary orbit on 20 August 1991. Intelsat 605 initially operated in a geostationary orbit with a perigee of , an apogee of , and 0 degrees of inclination. The satellite carried 38 IEEE C band and ten IEEE transponders, and had a design life of 13 years and a mass of . During late 1991, Intelsat 605 was operated at a longitude of 21.5 degrees west ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Transponder
In telecommunications, a transponder is a device that, upon receiving a signal, emits a different signal in response. The term is a blend word, blend of ''transmitter'' and ''responder''. In air navigation or radio frequency identification, a Transponder (aeronautics), flight transponder is an automated transceiver in an aircraft that emits a coded identifying signal in response to an interrogating received signal. In a communications satellite, a Transponder (satellite communications), satellite transponder receives signals over a range of uplink frequencies, usually from a satellite ground station; the transponder amplifies them, and re-transmits them on a different set of downlink frequencies to receivers on Earth, often without changing the content of the received signal or signals. Satellite/broadcast communications A communications satellite’s Communication channel, channels are called transponders because each is a separate transceiver or repeater. With digital video d ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ku Band
The Ku band () is the portion of the electromagnetic spectrum in the microwave range of frequencies from 12 to 18 gigahertz (GHz). The symbol is short for "K-under" (originally german: Kurz-unten), because it is the lower part of the original NATO K band, which was split into three bands (Ku, K, and Ka) because of the presence of the atmospheric water vapor resonance peak at 22.24 GHz, (1.35 cm) which made the center unusable for long range transmission. In radar applications, it ranges from 12 to 18 GHz according to the formal definition of radar frequency band nomenclature in IEEE Standard 521–2002. Ku band is primarily used for satellite communications, most notably the downlink used by direct broadcast satellites to broadcast satellite television, and for specific applications such as NASA's Tracking Data Relay Satellite used for International Space Station (ISS) communications and SpaceX Starlink satellites. Ku band satellites are also used for ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Communications Satellite
A communications satellite is an artificial satellite that relays and amplifies radio telecommunication signals via a transponder; it creates a communication channel between a source transmitter and a receiver at different locations on Earth. Communications satellites are used for television, telephone, radio, internet, and military applications. Many communications satellites are in geostationary orbit above the equator, so that the satellite appears stationary at the same point in the sky; therefore the satellite dish antennas of ground stations can be aimed permanently at that spot and do not have to move to track the satellite. Others form satellite constellations in low Earth orbit, where antennas on the ground have to follow the position of the satellites and switch between satellites frequently. The high frequency radio waves used for telecommunications links travel by line of sight and so are obstructed by the curve of the Earth. The purpose of communications sate ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Intelsat 10-02
Intelsat 10-02 (or IS 10-02, Intelsat 1002, IS-1002, Intelsat Alpha-2, Intelsat X-02 and Thor 10-02 ) is a communications satellite operated by Intelsat. Intelsat 10-02 is the first operational communications satellite to have its service life extended by Mission Extension Vehicle-2, while still in service, in 2021. Launch Intelsat 10-02 was launched by a Proton-M launch vehicle from Baikonur Cosmodrome, Kazakhstan, at 22:27:00 UTC on 16 June 2004. Capacity and coverage The satellite provides digital broadcasting, telephone, and broadband internet access to users in Europe, South America, Africa and the Middle East through its 36 Ku-band, and 70 C-band transponders after parking over 1° West longitude. Thor 10-02 Telenor uses half of the Ku-band capacity of the satellite, which is marketed as Thor 10-02. Docking to MEV-2 On 12 April 2021, Northrop Grumman's MEV-2 satellite successfully rendezvoused and docked to Intelsat 10-02. MEV-2 will extend IS 10-02's se ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Intelsat 906
Intelsat 906 (or IS-906) is a communications satellite operated by Intelsat. Launch Intelsat 906 was launched by an Ariane 4 rocket from Guiana Space Centre, French Guiana, at 06:44 UTC on September 6, 2002. Capacity and coverage It will broadcasting, business services, direct-to-home TV broadcasting, telecommunications and VSAT networks to Europe, Asia, and Australia through its 72 C band 22 Ku band transponders after parking over 64 degrees east longitude. It displaces Intelsat 804 which will then be moved to 176 degrees east to handle the increased cross-Atlantic demand. See also * 2002 in spaceflight External links * . Intelsat Intelsat S.A. (formerly INTEL-SAT, INTELSAT, Intelsat) is a multinational satellite services provider with corporate headquarters in Luxembourg and administrative headquarters in Tysons Corner, Virginia, United States. Originally formed as In ... References Intelsat satellites {{US-spacecraft-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Megahertz
The hertz (symbol: Hz) is the unit of frequency in the International System of Units (SI), equivalent to one event (or Cycle per second, cycle) per second. The hertz is an SI derived unit whose expression in terms of SI base units is s−1, meaning that one hertz is the reciprocal of one second. It is named after Heinrich Hertz, Heinrich Rudolf Hertz (1857–1894), the first person to provide conclusive proof of the existence of electromagnetic waves. Hertz are commonly expressed in metric prefix, multiples: kilohertz (kHz), megahertz (MHz), gigahertz (GHz), terahertz (THz). Some of the unit's most common uses are in the description of periodic waveforms and musical tones, particularly those used in radio- and audio-related applications. It is also used to describe the clock speeds at which computers and other electronics are driven. The units are sometimes also used as a representation of the photon energy, energy of a photon, via the Planck relation ''E'' = ''hν'', ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
27th Meridian East
The meridian 27° east of Greenwich is a line of longitude that extends from the North Pole across the Arctic Ocean, Europe, Asia, Africa, the Indian Ocean, the Southern Ocean, and Antarctica to the South Pole. The 27th meridian east forms a great circle with the 153rd meridian west. From Pole to Pole Starting at the North Pole and heading south to the South Pole The South Pole, also known as the Geographic South Pole, Terrestrial South Pole or 90th Parallel South, is one of the two points where Earth's axis of rotation intersects its surface. It is the southernmost point on Earth and lies antipod ..., the 27th meridian east passes through: : See also * 26th meridian east * 28th meridian east {{geographical coordinates, state=collapsed e027 meridian east ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
