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GIOVE
; ), or Galileo In-Orbit Validation Element, is the name for two satellites built for the European Space Agency (ESA) to test technology in orbit for the Galileo (satellite navigation), Galileo positioning system. The name was chosen as a tribute to Galileo Galilei, who discovered the first four natural satellites of Jupiter, and later discovered that they could be used as a universal clock to obtain the longitude of a point on the Earth's surface. The GIOVE satellites are operated by the GIOVE MissionGIOVE mission core infrastructure ESA press release, 26 February 2007. (GIOVE Mission, GIOVE-M) segment in the frame of the risk mitigation for the In Orbit Validation (IOV) of the Galileo positioning system. Purpose These validation satellites were previously known as the ''Galileo System ...[...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Galileo Positioning System
Galileo is a satellite navigation, global navigation satellite system (GNSS) created by the European Union through the European Space Agency (ESA) and operated by the European Union Agency for the Space Programme (EUSPA). It is headquartered in Prague, Czech Republic, Czechia, with two ground operations centres in Oberpfaffenhofen, Germany (mostly responsible for the control of the satellites), and in Fucine Lake, Fucino, Italy (mostly responsible for providing the navigation data). The €10 billion project began offering limited services in 2016. It is named after the Italian astronomer Galileo Galilei. One of the aims of Galileo is to provide an independent high-precision positioning system so European political and military authorities do not have to rely on the United States Global Positioning System, GPS or the Russian GLONASS systems, which could be disabled or degraded by their operators at any time. The use of basic (lower-precision) Galileo services is free and open ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
European Satellite Navigation Industries
European Satellite Navigation Industries, formerly called Galileo Industries until legal action prompted a name change, was a joint venture of the companies Alcatel Alenia Space and Thales (France), Finmeccanica (Italy), EADS Astrium (UK and Germany) and Galileo Sistemas y Servicios (a consortium of seven Spanish companies). The company was the primary construction company for the Galileo positioning system, tasked with developing and building the satellites and components for the ground segment infrastructure of this satellite navigation system. The partner firms committed to not construct competing products for Galileo. However, some competition came from Surrey Satellite Technology Ltd, which successfully built and launched the first GIOVE-A testbed satellite, and which was then awarded a contract for a followon GIOVE-A2 satellite while the joint venture's GIOVE-B satellite remained on the ground awaiting launch. Since that time, the GIOVE-B satellite successfully launched, a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chilbolton Observatory
The Chilbolton Observatory is a facility for atmospheric and radio research located on the edge of the village of Chilbolton near Stockbridge in Hampshire, England. The facilities are run by the STFC Radio Communications Research Unit of the Rutherford Appleton Laboratory and form part of the Science and Technology Facilities Council. Overview The Chilbolton Observatory operates many pieces of research equipment associated with radar propagation and meteorology. , these include: * An S band Doppler weather radar with its distinctive, fully steerable, parabolic antenna. This equipment can be referred to as CAMRa (Chilbolton Advanced Meteorological Radar). * An L band Clear-air radar * A W band bistatic zenith radar * A UV Raman Lidar * Multiple Ka band radiometers * Multiple rain gauges The observatory also hosts the UK's LOFAR station. Timeline of projects * 1998 - CLARE'98 Cloud Lidar and Radar experiment, which eventually fed into the European Space Agency EarthCA ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Soyuz-FG
The Soyuz-FG was an improved variant of the Soyuz-U launch vehicle from the R-7 (rocket family), R-7 rocket family, developed by the Progress Rocket Space Centre in Samara, Russia. It featured upgraded first and second stage engines, RD-107A and RD-108A, respectively, with enhanced injector heads that improved combustion efficiency and specific impulse. The designation "FG" refers to ''forsunochnaya golovka'' (''injector head'') in Russian. Soyuz-FG made its maiden flight on 20 May 2001, delivering a Progress (spacecraft), Progress cargo spacecraft to the International Space Station (ISS). It became the primary vehicle for launching crewed Soyuz TMA, Soyuz TMA-M, and Soyuz MS spacecraft from 2002 until its retirement in 2019. Launches occurred from the Baikonur Cosmodrome in Kazakhstan: crewed missions from Gagarin's Start (Site 1/5) and satellite launches from Site 31/6. Design Soyuz-FG was introduced in May 2001 as a transitional solution while the more advanced Soyuz-2 was ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fregat
Fregat () is an upper stage developed by NPO Lavochkin for universal compatibility with a wide range of medium- and heavy-lift launch vehicles. Fregat has been used primarily with Soyuz and Zenit rockets, and entered operational service in February 2000. Fregat uses a liquid-propellant engine burning unsymmetrical dimethylhydrazine (UDMH) fuel and dinitrogen tetroxide () oxidizer, a pair of hypergolic propellants that ignite on contact. With a success rate of 97.3%, including two failures and one partial failure, Fregat is among the most reliable upper stages in operation. It has deployed more than 300 payloads into a variety of orbits and is capable of placing three or more spacecraft into distinct orbits during a single mission, owing to its ability to restart up to seven times and operate for a total burn duration of up to 1,350 seconds. Description The Fregat upper stage is a versatile and autonomous vehicle designed to inject large payloads into a range of orbits ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Surrey Satellite Technology Ltd
Surrey Satellite Technology Ltd, or SSTL, is a company involved in the manufacture and operation of small satellites. A spin-off company of the University of Surrey, it is presently wholly owned by Airbus Defence and Space. The company began out of research efforts centred upon amateur radio satellites, known by the UoSAT (University of Surrey Satellite) name or by an OSCAR (Orbital Satellite Carrying Amateur Radio) designation. SSTL was founded in 1985, following successful trials on the use of commercial off-the-shelf (COTS) components on satellites, cumulating in the ''UoSat-1'' test satellite. It funds research projects with the university's Surrey Space Centre, which does research into satellite and space topics. In April 2008, the University of Surrey agreed to sell its majority share in the company to European multinational conglomerate EADS Astrium. In August 2008, SSTL opened a US subsidiary, which included both offices and a production site in Denver, Colorado; [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Medium Earth Orbit
A medium Earth orbit (MEO) is an geocentric orbit, Earth-centered orbit with an altitude above a low Earth orbit (LEO) and below a high Earth orbit (HEO) – between above sea level.''Catalog of Earth Satellite Orbits'' NASA Earth Observatory. 4 September 2009. Accessed 2 May 2021. The boundary between MEO and LEO is an arbitrary altitude chosen by accepted convention, whereas the boundary between MEO and HEO is the particular altitude of a geosynchronous orbit, in which a satellite takes 24 hours to circle the Earth, the same period as the Earth’s own rotation. All satellites in MEO have an orbital period of less than 24 hours, with the minimum period (for a circular orbit at the lowest MEO altitude) about 2 hours. Satellites in MEO or ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Baikonur Cosmodrome
The Baikonur Cosmodrome is a spaceport operated by Russia within Kazakhstan. Located in the Kazakh city of Baikonur, it is the largest operational space launch facility in terms of area. All Russian Human spaceflight, crewed spaceflights are launched from Baikonur. Situated in the Kazakh Steppe, some above sea level, it is to the east of the Aral Sea and north of the Syr Darya. It is close to Töretam, a station on the Trans-Aral Railway. Russia, as the official successor state to the Soviet Union, has retained control over the facility since 1991; it originally assumed this role through the post-Soviet Commonwealth of Independent States (CIS), but ratified an agreement with Kazakhstan in 2005 that allowed it to lease the spaceport until 2050. It is jointly managed by Roscosmos and the Russian Aerospace Forces. In 1955, the Ministry of Defense (Soviet Union), Soviet Ministry of Defense issued a decree and founded the Baikonur Cosmodrome. It was originally built as the chief ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Jupiter
Jupiter is the fifth planet from the Sun and the List of Solar System objects by size, largest in the Solar System. It is a gas giant with a Jupiter mass, mass more than 2.5 times that of all the other planets in the Solar System combined and slightly less than one-thousandth the mass of the Sun. Its diameter is 11 times that of Earth and a tenth that of the Sun. Jupiter orbits the Sun at a distance of , with an orbital period of . It is the List of brightest natural objects in the sky, third-brightest natural object in the Earth's night sky, after the Moon and Venus, and has been observed since prehistoric times. Its name derives from that of Jupiter (god), Jupiter, the chief deity of ancient Roman religion. Jupiter was the first of the Sun's planets to form, and its inward migration during the primordial phase of the Solar System affected much of the formation history of the other planets. Jupiter's atmosphere consists of 76% hydrogen and 24% helium by mass, with a denser ... [...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 orbit, circular geosynchronous orbit in altitude above Earth's equator, in radius from Earth's center, and following the retrograde and prograde motion, direction of Earth's rotation. An object in such an orbit has an orbital period equal to Earth's rotational period, one sidereal time, 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 dish, satellite antennas do not have to rotate to track t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
