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I-4 Satellite
The Inmarsat-4 satellites, or I-4 satellites are a satellite constellation operated by Inmarsat. They provide the Inmarsat BGAN, FleetBroadband, and SwiftBroadband communications networks. They operate on the L band everywhere on Earth Earth is the third planet from the Sun and the only astronomical object known to Planetary habitability, harbor life. This is enabled by Earth being an ocean world, the only one in the Solar System sustaining liquid surface water. Almost all ..., except in polar regions. According to Inmarsat, their launch created the first global 3G mobile network. The first three were launched between 2005 and 2008. They had a mass (at launch) of 5.96 tonnes, and were intended to last 13 years The dimensions of the main body comparable to a double-decker bus at 7m x 2.9m x 2.3m. Including the solar arrays, however, the wingspan is 45 meters, closer to the size of a soccer pitch. The reflectors are 9 meters wide. Data services Both streaming and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Satellite Constellation
A satellite constellation is a group of artificial satellites working together as a system. Unlike a single satellite, a constellation can provide permanent global or near-global pass (spaceflight), coverage, such that at any time everywhere on Earth at least one satellite is visible. Satellites are typically placed in sets of complementary orbital plane (astronomy), orbital planes and connect to globally distributed ground stations. They may also use Inter-satellite service, inter-satellite communication. Other satellite groups Satellite constellations should not be confused with: * ''satellite clusters'', which are groups of satellites moving very close together in almost identical orbits (see satellite formation flying); * '':Satellite series, satellite series'' or ''satellite programs'' (such as Landsat program, Landsat), which are generations of satellites launched in succession; * ''satellite fleets'', which are groups of satellites from the same manufacturer or operator tha ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Inmarsat
Inmarsat is a British communications satellite, satellite telecommunications company, offering global mobile services. It provides telephone and data services to users worldwide, via portable or mobile terminals which communicate with ground stations through fifteen geostationary telecommunications satellites. Inmarsat's network provides communications services to a range of governments, aid agency, aid agencies, media outlets and businesses (especially in the shipping, airline and mining industries) with a need to communicate in remote regions or where there is no reliable Earth, terrestrial network. The company was listed on the London Stock Exchange until it was acquired by Connect Bidco, a consortium consisting of Apax Partners, Warburg Pincus, the CPP Investment Board and the Ontario Teachers' Pension Plan, in December 2019. On 8 November 2021, Inmarsat's owners and Viasat (American company), Viasat announced the purchase of Inmarsat by Viasat. The acquisition was comp ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Broadband Global Area Network
The Broadband Global Area Network (BGAN) is a global satellite network with telephony owned by Inmarsat using portable terminals. The terminals are normally used to connect a laptop computer to broadband Internet in remote locations, although as long as line-of-sight to the satellite exists, the terminal can be used anywhere. The value of BGAN terminals is that, unlike other satellite Internet services, which require bulky and heavy satellite dishes to connect, a BGAN terminal is about the size of a laptop and thus can be carried easily. The network is provided by Inmarsat and uses three geostationary satellites called I-4 to provide almost global coverage. Details Downlink speeds of high-end BGAN terminals are up to 492 kbit/s, and upload speeds are up to 492 kbit/s - Best Effort as BGAN Background IP (BIP) is a contended (shared) channel. As with all geosynchronous satellite connections, latency is an issue. Typical latency is 0.6–1.5 seconds round trip for t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
FleetBroadband
FleetBroadband is maritime satellite internet, telephony, SMS, SMS texting, and ISDN network for Ocean-going vessel, ocean-going vessels using portable domed terminal Antenna (radio), antennas. These antennas and corresponding indoor controllers are used to connect phones and laptop computers from sailing vessels to the Internet. All antennas require Line-of-sight propagation, line-of-sight (LOS) to one of three geosynchronous orbit satellites, thus allowing the terminal to be used on land as well. Details The FleetBroadband network was developed by Inmarsat and is composed of three geosynchronous orbiting satellites known as I-4 satellite, I-4s that allow contiguous global coverage, except for the poles. FleetBroadband systems installed on vessels may travel from ocean to ocean without human interaction. Line-of-sight to the ''I-4'' satellites is required for connectivity, which can be achieved even in rough rolling seas. Since the FleetBroadband network uses the L band, it is m ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
SwiftBroadband
SwiftBroadband is an IP-based packet-switched communications network that provides a symmetric ‘always-on’ data connection of up to 650 kbit/s per channel for aircraft globally except for the polar regions, using the Inmarsat satellite constellation. Details Designed to compete in the business aviation communications market, it has been studied as an approach for Air Traffic Management by Eurocontrol (the pan-European air traffic management organization). In Standard IP mode, the service is shared with other concurrent users of the system, providing a ‘best effort’ service. SwiftBroadband can also provide a pre-determined quality of service through Streaming mode. There are 200 spot beams per satellite with each beam supporting up to 90 channels of 432 kbit/sThree satellitescover the entire globe with the exception of the polar regions. For Standard IP service, the throughput that an end-user experiences depends on the load on the channel as well as other factors ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Telecommunications Network
A telecommunications network is a group of Node (networking), nodes interconnected by telecommunications links that are used to exchange messages between the nodes. The links may use a variety of technologies based on the methodologies of circuit switching, message switching, or packet switching, to pass messages and signals. Multiple nodes may cooperate to pass the message from an originating node to the destination node, via multiple network hops. For this routing function, each node in the network is assigned a network address for identification and locating it on the network. The collection of addresses in the network is called the address space of the network. Examples of telecommunications networks include computer networks, the Internet, the public switched telephone network (PSTN), the global Telex network, the aeronautical ACARS network, and the wireless radio networks of cell phone telecommunication providers. Network structure this is the structure of network genera ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
L Band
The L band is the Institute of Electrical and Electronics Engineers (IEEE) designation for the range of frequencies in the radio spectrum from 1 to 2 gigahertz (GHz). This is at the top end of the ultra high frequency (UHF) band, at the lower end of the microwave range. Applications Mobile service In Europe, the Electronic Communications Committee (ECC) of the European Conference of Postal and Telecommunications Administrations (CEPT) has harmonized part of the L band (1452–1492 MHz), allowing individual countries to adopt this spectrum for terrestrial mobile/fixed communications networks supplemental downlink (MFCN SDL). By means of carrier aggregation, an LTE-Advanced or UMTS/HSDPA base station could use this spectrum to provide additional bandwidth for communications from the base station to the mobile device; i.e., in the downlink direction. In the Americas, mobile services are operated between the 1.7 GHz to 2.1 GHz range in the PCS and AWS bands. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Earth
Earth is the third planet from the Sun and the only astronomical object known to Planetary habitability, harbor life. This is enabled by Earth being an ocean world, the only one in the Solar System sustaining liquid surface water. Almost all of Earth's water is contained in its global ocean, covering Water distribution on Earth, 70.8% of Earth's crust. The remaining 29.2% of Earth's crust is land, most of which is located in the form of continental landmasses within Earth's land hemisphere. Most of Earth's land is at least somewhat humid and covered by vegetation, while large Ice sheet, sheets of ice at Polar regions of Earth, Earth's polar polar desert, deserts retain more water than Earth's groundwater, lakes, rivers, and Water vapor#In Earth's atmosphere, atmospheric water combined. Earth's crust consists of slowly moving tectonic plates, which interact to produce mountain ranges, volcanoes, and earthquakes. Earth's outer core, Earth has a liquid outer core that generates a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Polar Regions Of Earth
The polar regions, also called the frigid zones or polar zones, of Earth are Earth's polar ice caps, the regions of the planet that surround its geographical poles (the North and South Poles), lying within the polar circles. These high latitudes are dominated by floating sea ice covering much of the Arctic Ocean in the north, and by the Antarctic ice sheet on the continent of Antarctica and the Southern Ocean in the south. Definitions The Arctic has various definitions, including the region north of the Arctic Circle (currently Epoch 2010 at 66°33'44" N), or just the region north of 60° north latitude, or the region from the North Pole south to the timberline. The Antarctic is usually defined simply as south of 60° south latitude, or the continent of Antarctica. The 1959 Antarctic Treaty uses the former definition. The two polar regions are distinguished from the other two climatic and biometric belts of Earth, a tropics belt near the equator, and two middle latitude ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Inmarsat-4 F1
Inmarsat-4 F1 is a communications I-4 satellite operated by the British satellite operator Inmarsat. It was launched into a geosynchronous orbit at 21:42 GMT on 11 March 2005 from Space Launch Complex 41 at Cape Canaveral, Florida. By an Atlas V in the 431 configuration. It is currently located at 143.5 degrees East. Inmarsat-4 F1 was constructed by EADS Astrium, using a Eurostar E3000 The Eurostar E3000 is a generic satellite model most commonly used for commercial and military communications satellites manufactured by Airbus Defence and Space (formerly Astrium). It is a member of Airbus Defence and Space's Eurostar family. I ... bus. It has a mass of 5959 kg and is expected to operate for 13 years On 17 February 2018 Inmarsat-4 F1 experienced outage due to loss of attitude control. On 17 April 2023 Inmarsat-4 F1 suffered a partial loss of power from one of its solar arrays, resulting in an "extended outage" which affected all services provided by the satellite. I-4 F1's ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Inmarsat-4 F3
Inmarsat-4 F3 is a communications I-4 satellite operated by the British satellite operator Inmarsat. It was launched into a geosynchronous orbit at 22:43 GMT on 18 August 2008, by a Proton-M/Briz-M Enhanced carrier rocket. It is currently located at 97.65° West longitude, providing coverage of the Americas. It entered service on 7 January 2009. Like the earlier Inmarsat-4 F1 and F2 satellites, Inmarsat-4 F3 was constructed by EADS Astrium, using a Eurostar E3000 bus. It has a mass of 5,960 kilograms, and is expected to operate for 13 years. It was originally slated for launch using an Atlas V Atlas V is an expendable launch system and the fifth major version in the Atlas (rocket family), Atlas launch vehicle family. It was developed by Lockheed Martin and has been operated by United Launch Alliance (ULA) since 2006. Primarily used to ... 531, but was transferred to Proton due to a large backlog of Atlas launches. In the United States, Inmarsat ground stations are licensed to ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Inmarsat-4A F4
Inmarsat-4A F4, also known as Alphasat and Inmarsat-XL, is a large geostationary communications I-4 satellite operated by United Kingdom-based Inmarsat in partnership with the European Space Agency. Launched in 2013, it is used to provide mobile communications to Africa and parts of Europe and Asia. Inmarsat-4A F4 has been constructed by EADS Astrium and Thales Alenia Space based on the Alphabus satellite bus. It was the first Alphabus spacecraft to be launched, and as such it carries several experimental communications systems in addition to its commercial payload. The spacecraft had a launch mass of , and is expected to operate for at least fifteen years. Arianespace had been contracted to launch Inmarsat-4A F4, with an Ariane 5ECA rocket, flight number VA-214, delivering it and INSAT-3D into geosynchronous transfer orbit. The rocket lifted off from ELA-3 at Kourou at 19:54:07 UTC on 25 July 2013, with Inmarsat-4A F4 separating from the rocket around 27 minutes later. The sp ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
