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AsiaStar
AsiaStar is an American communications satellite which was operated by 1worldspace. It was constructed by Matra Marconi Space with Alcatel Space based on the Eurostar E2000+ bus design. Launch occurred on 21 March 2000, at 23:29:00 UTC. The launch was contracted by Arianespace, and used an Ariane 5G carrier rocket flying from ELA-3 at the Centre Spatial Guyanais. The INSAT-3B satellite was launched on the same rocket. Following its launch and on-orbit testing, it was placed in geostationary orbit at 105.0° East, from where it provides mobile communications services to Asia. It carries three transponders, and has an expected on-orbit lifespan of 12 years. The satellite had a weight of 2777 kg, and 5.6 kW of power, and three-axis stabilized; has relayed digital radio broadcasts to East Asia. On 31 December 2009, Worldspace ceased broadcasting on the Asiastar satellite in line with its bankruptcy issues. However, as of 30 November 2010, two Free to Air Free-t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1worldspace
1worldspace, known for most of its existence simply as WorldSpace, is a defunct satellite radio network that in its heyday provided service to over 170,000 subscribers in eastern, southern and northern Africa, the Middle East, and much of Asia with 96% coming from India. It was profitable in India, with 450,000 subscribers. The two operational satellites that the company had, AfriStar and AsiaStar, are now being used by their new owner, thYazmi USA, LLCrun by WorldSpace's former CEO Noah A. Samara. The company claims to have built the first satellite-to-tablet content delivery system. The system primarily aims at providing educational services to rural areas in developing countries. The first pilots of the technology are said to be taking place in India (with 30,000 licenses) and the sub-Saharan region in Africa, with the latest trials in two schools in South Africa, in Rietkol, in Mpumalanga Province, and at Heathfield, in Western Cape. Overview The company, founded in 199 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
INSAT-3B
INSAT-3B is an Indian communications satellite which was built by the Indian Space Research Organisation and operated by Indian National Satellite System. Overview INSAT–3B is the first satellite built under INSAT–3 series of satellites to join INSAT system. It is based on the I-2000 satellite bus. This satellite primarily serves to business communication, mobile communication and developmental communication.it provides the first set to transponders for Swaran Jayanti Vidya Vikas Antariksh Upagraha Yojana (Vidya Vahini) for interactive training and developmental communication. It is 3 – axis body stabilized in orbit using momentum and reaction wheels, solar flaps, magnetic torquers and eight 10 N and eight 22 N reaction control thrusters. Its propulsion system consists of 440 N Liquid Apogee Motor MON-3 (Mixed Oxides of Nitrogen) and MMH (MonoMethylHydrazine) for orbit raising. Launch Insat-3B was launched on the 128th flight of European launch vehicle, Ariane of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eurostar (satellite Bus)
Eurostar is a satellite bus made by Airbus Defence and Space (formerly Astrium, and before 1994, British Aerospace, and Matra Marconi Space (the former Marconi Space having been merged with Matra's former "Matra Espace" division) which has been used for a series of spacecraft providing telecommunications services in geosynchronous orbit (GEO). More than 70 Eurostar satellites have been ordered to date, of which more than 55 have been successfully launched since October 1990 and have proven highly reliable in operational service. In December 2013, the Eurostar satellites accumulated 500 years of successful operations in orbit. The Eurostar spacecraft series is designed for a variety of telecommunications needs including fixed services and broadcast, mobile services, broadband and secured communications. Development Eurostar was designed in the mid 1980s jointly by Matra Marconi Space and BAe (now integrated within Airbus Defence and Space) to Inmarsat specifications, for a market whi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Matra Marconi Space
Matra Marconi Space (MMS) was a Franco-British aerospace company. History Matra Marconi Space was established in 1990 as a joint venture between the space and telecommunication divisions of the Lagardère Group ( Matra Espace) and the GEC group ( Marconi Space Systems). The merged company was announced in December 1989 and was owned 51% by Matra and 49% by GEC-Marconi. It would have annual sales of £300 million, with £8.7 million in assets from Marconi Space Systems and £10.7 million in assets from Matra Espace. Claude Goumy, the Managing Director of Matra Espace was the first Managing Director. The first deputy Managing Director was Richard Wignall, the former Managing Director of Marconi Space Systems. The space industry was important to France - almost half the budget of the European Space Agency (ESA) came from the French government. Acquisitions In 1991, British Aerospace was discussing with MMS how to merge their space interests, as well as Robert Bosch GmbH a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ariane 5
Ariane 5 is a European heavy-lift space launch vehicle developed and operated by Arianespace for the European Space Agency (ESA). It is launched from the Centre Spatial Guyanais (CSG) in French Guiana. It has been used to deliver payloads into geostationary transfer orbit (GTO) or low Earth orbit (LEO). The launch vehicle had a streak of 82 consecutive successful launches between 9 April 2003 and 12 December 2017. Since 2014, Ariane 6, a direct successor system, is in development. The system was designed as an expendable launch system by the '' Centre national d'études spatiales'' (CNES), the French government's space agency, in cooperation with various European partners. Despite not being a direct derivative of its predecessor launch vehicle program, it is classified as part of the Ariane rocket family. ArianeGroup is the prime contractor for the manufacturing of the vehicles, leading a multi-country consortium of other European contractors. Ariane 5 was originally inten ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
ELA-3
ELA-3 (french: Ensemble de Lancement Ariane 3, lit=Ariane Launch Complex 3), is a launch pad and associated facilities at the Centre Spatial Guyanais in French Guiana. ELA-3 is operated by Arianespace as part of the expendable launch system for Ariane 5 Ariane 5 is a European heavy-lift space launch vehicle developed and operated by Arianespace for the European Space Agency (ESA). It is launched from the Centre Spatial Guyanais (CSG) in French Guiana. It has been used to deliver payloads in ... launch vehicles. , 114 launches have been carried out from it, the first of which occurred on 4 June 1996. ELA-3 is 21 square kilometres in size. Launch history Scheduled flights References {{Ariane Guiana Space Centre ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Three-axis Stabilization
Spacecraft attitude control is the process of controlling the orientation of a spacecraft (vehicle/satellite) with respect to an inertial frame of reference or another entity such as the celestial sphere, certain fields, and nearby objects, etc. Controlling vehicle attitude requires sensors to measure vehicle orientation, actuators to apply the torques needed to orient the vehicle to a desired attitude, and algorithms to command the actuators based on (1) sensor measurements of the current attitude and (2) specification of a desired attitude. The integrated field that studies the combination of sensors, actuators and algorithms is called guidance, navigation and control (GNC). Overview A spacecraft's attitude must typically be stabilized and controlled for a variety of reasons. It is often needed so that the spacecraft high-gain antenna may be accurately pointed to Earth for communications, so that onboard experiments may accomplish precise pointing for accurate collection ... [...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] |
Jonathan's Space Report
''Jonathan's Space Report'' (JSR) is a newsletter about the Space Age, hosted at Jonathan's Space Page. It is written by Jonathan McDowell, a Center for Astrophysics Harvard & Smithsonian astrophysicist. It is updated as McDowell's schedule permits, but he tries to publish two issues each month. Originally the website was hosted on a Harvard University account, but was moved in late 2003 to a dedicated domain. Started in 1989, the newsletter reports on recent space launches, International Space Station activities and space craft developments. McDowell's report occasionally corrects NASA's official web sites, or provides additional data on classified launches that aren't available elsewhere. Associated projects on the JSR web site are: * A catalog of all known geosynchronous satellites and their current positions * A listing of satellite launch attempts * A cross-reference between catalog number and international designation of artificial satellites McDowell has long campaign ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Radio France International
Radio France Internationale, usually referred to as RFI, is the state-owned international radio broadcaster of France. With 37.2 million listeners in 2014, it is one of the most-listened-to international radio stations in the world, along with Deutsche Welle, the BBC World Service, the Voice of America, Radio Netherlands Worldwide, and China Radio International. RFI broadcasts 24 hours per day around the world in French and in 12 other languages in FM, shortwave, medium wave, satellite and on its website. It is a channel of the state company France Médias Monde. The majority of shortwave transmissions are in French and Hausa but also includes some hours of Swahili, Portuguese, Mandinka, and Russian. RFI broadcasts to over 150 countries on 5 continents. Africa is the largest part of radio listeners, representing 60% of the total audience in 2010. In the Paris region, RFI comprises between 150,000 and 200,000 listeners. In 2007, the audience was of 46.1 million listeners, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
