|
ChinaSat 12
ChinaSat 12 () communications satellite is wholly owned by China Satellite Communications, with part of its communications payload leased or rented by SupremeSAT, a Sri Lankan company to be marketed to potential users as ''SupremeSAT-I''. Once operational, it will provide communications services for the China, Sri Lanka, East Asia, South Asia, Middle East, Africa, Australia and China sea area, the Indian Ocean region. ChinaSat 12 was also known as Apstar 7B (as a backup of Apstar 7), but acquired by China Satellite Communications from its subsidiary APT Satellite Holdings in 2010. However, APT Satellite Holdings was contracted by its parent company as the operator of ChinaSat 12. Orbit Following launch on 27 November 2012, the satellite was placed into geosynchronous orbit and located at 51.5° East while being tested. The satellite was built by Thales Alenia Space Thales Alenia Space () is a Franco-Italian aerospace manufacturer. A joint venture between the French techno ... [...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 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sri Lanka
Sri Lanka (, ; si, ශ්රී ලංකා, Śrī Laṅkā, translit-std=ISO (); ta, இலங்கை, Ilaṅkai, translit-std=ISO ()), formerly known as Ceylon and officially the Democratic Socialist Republic of Sri Lanka, is an island country in South Asia. It lies in the Indian Ocean, southwest of the Bay of Bengal, and southeast of the Arabian Sea; it is separated from the Indian subcontinent by the Gulf of Mannar and the Palk Strait. Sri Lanka shares a maritime border with India and Maldives. Sri Jayawardenepura Kotte is its legislative capital, and Colombo is its largest city and financial centre. Sri Lanka has a population of around 22 million (2020) and is a multinational state, home to diverse cultures, languages, and ethnicities. The Sinhalese are the majority of the nation's population. The Tamils, who are a large minority group, have also played an influential role in the island's history. Other long established groups include the Moors, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Communications Satellites Of China
Communication (from la, communicare, meaning "to share" or "to be in relation with") is usually defined as the transmission of information. The term may also refer to the message communicated through such transmissions or the field of inquiry studying them. There are many disagreements about its precise definition. John Peters argues that the difficulty of defining communication emerges from the fact that communication is both a universal phenomenon and a specific discipline of institutional academic study. One definitional strategy involves limiting what can be included in the category of communication (for example, requiring a "conscious intent" to persuade). By this logic, one possible definition of communication is the act of developing meaning among entities or groups through the use of sufficiently mutually understood signs, symbols, and semiotic conventions. An important distinction is between verbal communication, which happens through the use of a language, an ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Satellites Of China
A satellite or artificial satellite is an object intentionally placed into orbit in outer space. Except for passive satellites, most satellites have an electricity generation system for equipment on board, such as solar panels or radioisotope thermoelectric generators (RTGs). Most satellites also have a method of communication to ground stations, called transponders. Many satellites use a standardized bus to save cost and work, the most popular of which is small CubeSats. Similar satellites can work together as a group, forming constellations. Because of the high launch cost to space, satellites are designed to be as lightweight and robust as possible. Most communication satellites are radio relay stations in orbit and carry dozens of transponders, each with a bandwidth of tens of megahertz. Satellites are placed from the surface to orbit by launch vehicles, high enough to avoid orbital decay by the atmosphere. Satellites can then change or maintain the orbit by propuls ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Spacecraft Launched In 2012
A spacecraft is a vehicle or machine designed to fly in outer space. A type of artificial satellite, spacecraft are used for a variety of purposes, including communications, Earth observation, meteorology, navigation, space colonization, planetary exploration, and transportation of humans and cargo. All spacecraft except single-stage-to-orbit vehicles cannot get into space on their own, and require a launch vehicle (carrier rocket). On a sub-orbital spaceflight, a space vehicle enters space and then returns to the surface without having gained sufficient energy or velocity to make a full Earth orbit. For orbital spaceflights, spacecraft enter closed orbits around the Earth or around other celestial bodies. Spacecraft used for human spaceflight carry people on board as crew or passengers from start or on orbit (space stations) only, whereas those used for robotic space missions operate either autonomously or telerobotically. Robotic spacecraft used to support scientific re ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Communications Satellites In Geostationary Orbit
Communication (from la, communicare, meaning "to share" or "to be in relation with") is usually defined as the transmission of information. The term may also refer to the message communicated through such transmissions or the field of inquiry studying them. There are many disagreements about its precise definition. John Peters argues that the difficulty of defining communication emerges from the fact that communication is both a universal phenomenon and a specific discipline of institutional academic study. One definitional strategy involves limiting what can be included in the category of communication (for example, requiring a "conscious intent" to persuade). By this logic, one possible definition of communication is the act of developing meaning among entities or groups through the use of sufficiently mutually understood signs, symbols, and semiotic conventions. An important distinction is between verbal communication, which happens through the use of a language, and n ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
APT Satellite Holdings
APT Satellite Holdings Limited is a Bermuda-incorporated holding company. Its Hong Kong-incorporated subsidiary APT Satellite Co., Ltd. is the operator of the Apstar satellite constellation. APT Satellite Holdings and APT Satellite are headquartered in Hong Kong. As at 30 June 2016 the company had a market capitalisation of HK$3.816 billion. It is a red chip company, as it was an overseas incorporated company, but controlled by the Chinese Government indirectly (via China Aerospace Science and Technology Corporation). Fellow Hong Kong-based satellite company AsiaSat was also partially owned by the Chinese Government (via CITIC Group), but belongs to a different department of the State Council. History The establishment of APT Satellite Company Limited was officially approved by the State Council of the People's Republic of China on 26 March 1992, the company's incorporation on 21 January 1992 as Free Union Limited, renaming to Trans-Asia-Pacific Satellite Communications Co., ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Apstar 7
Apstar-7 is a Chinese communications satellite which is operated by APT Satellite as part of the Apstar system. It was launched in 2012 as a replacement for the Apstar 2R satellite launched in 1997. Apstar-7 was constructed by Thales Alenia Space, and is based on the Spacebus-4000C2 satellite bus. The satellite had a mass at launch of , and is expected to operate for at least 15 years. It is positioned in geostationary orbit at a longitude of 76.5 degrees East, and carries 56 transponders with an operating power of 8.4 kilowatts; 28 operating in the C band and providing services to Asia, Africa, eastern and central Europe and Australia and the other 28 operating in the , covering Africa, the Middle East, China, and Taiwan. The satellite's solar arrays generate 11.4 kilowatts of power. Apstar-7 was launched by a Long March 3B/E carrier rocket, flying from Launch Complex 2 at the Xichang Satellite Launch Centre. Liftoff took place at 10:27 UTC on 31 March 2012, with the rocket p ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
SupremeSAT
SupremeSAT (Pvt) Ltd. is the first and only Sri Lankan satellite operator. It has partnership with satellite manufacturing institution China Great Wall Industry Corporation (CGWIC). SupremeSAT deployed the first Sri Lankan satellite, Supreme SAT-I on November 12, 2012, launched on Long March 3B from Xichang, China. Supreme SAT-I is jointly owned by China's CGWIC and SupremeSAT. SupremeSAT becomes the 27th private company in the world to own a satellite. SupremeSAT is planned to invest over US$320 million, and planning to launch Sri Lanka's first ever 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. .... It will be called SupremeSAT-III. The SupremeSAT-III will be providing all types of telecommunications services to Sri Lanka.SupremeSAT has laid foundation ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
China Satellite Communications
China Satellite Communications Co., Ltd. known as China Satcom is a Chinese aerospace company that provides services via satellites. The company was a subsidiary of China Aerospace Science and Technology Corporation (CASC). China Satellite Communications operated the brand ChinaSat. APT Satellite Holdings, a listed company that was jointly controlled by China Satellite Communications and China Great Wall Industry Corporation (another subsidiary of CASC), operated satellites under the brand Apstar. Before re-incorporated as a limited company, the company was known as China Satellite Communications Corporation. History China Satellite Communications Corporation was formed sometime in 2000 by the merger of several satellite companies of the In 2009, China Satellite Communications Corporation, a state-owned enterprise that was supervised by the State-owned Assets Supervision and Administration Commission of the State Council directly, was dismantled and distributed to China Aerospac ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Geostationary Orbit
A geostationary orbit, also referred to as a geosynchronous equatorial orbit''Geostationary orbit'' and ''Geosynchronous (equatorial) orbit'' are used somewhat interchangeably in sources. (GEO), is a circular geosynchronous orbit in altitude above Earth's equator ( in radius from Earth's center) and following the direction of Earth's rotation. An object in such an orbit has an orbital period equal to Earth's rotational period, one sidereal day, and so to ground observers it appears motionless, in a fixed position in the sky. The concept of a geostationary orbit was popularised by the science fiction writer Arthur C. Clarke in the 1940s as a way to revolutionise telecommunications, and the first satellite to be placed in this kind of orbit was launched in 1963. Communications satellites are often placed in a geostationary orbit so that Earth-based satellite antennas do not have to rotate to track them but can be pointed permanently at the position in the sky where the s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Geocentric Orbit
A geocentric orbit or Earth orbit involves any object orbiting Earth, such as the Moon or artificial satellites. In 1997, NASA estimated there were approximately 2,465 artificial satellite payloads orbiting Earth and 6,216 pieces of space debris as tracked by the Goddard Space Flight Center. More than 16,291 objects previously launched have undergone orbital decay and entered Earth's atmosphere. A spacecraft enters orbit when its centripetal acceleration due to gravity is less than or equal to the centrifugal acceleration due to the horizontal component of its velocity. For a low Earth orbit, this velocity is about ; by contrast, the fastest crewed airplane speed ever achieved (excluding speeds achieved by deorbiting spacecraft) was in 1967 by the North American X-15. The energy required to reach Earth orbital velocity at an altitude of is about 36 MJ/kg, which is six times the energy needed merely to climb to the corresponding altitude. Spacecraft with a perigee belo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
