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Yamal 102
Yamal-102 (Russian language, Russian: ) was a geostationary orbit, geostationary communications satellite operated by Gazprom Space Systems, Gazkom and built by Energia (corporation), RSC Energia. It was, along with Yamal-101 the first communications satellite of the Yamal (satellite constellation), Yamal programme and the first iteration of the USP (satellite bus), USP Bus. It was a satellite with 2200 watts of power (1300 watts available for the payload) on an unpressurized bus. It had eight SPT-100, SPT-70 Electrically powered spacecraft propulsion, electric thrusters by OKB Fakel for Orbital station-keeping, station keeping. Its payload was 12 C band (IEEE), C-band equivalent Transponder (satellite communications), transponders supplied by SSL (company), Space Systems/Loral. History It was launched along Yamal-101 on 6 September 1999 at 16:36:00 Coordinated Universal Time, UTC from Baikonur Cosmodrome, Baikonur Baikonur Cosmodrome Site 81, Site 81/23 by a Proton-K / Blok ... [...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] |
Yamal-101
Yamal-101 (Russian: ) was a geostationary communications satellite operated by Gazprom Space Systems and built by RSC Energia. It was, along with Yamal-102 the first communications satellite of the Yamal programme and the first iteration of the USP Bus. It was a satellite with 2200 watts of power (1300 watts available for the payload) on an unpressurized bus. It had eight SPT-70 electric thrusters by OKB Fakel for station keeping. Its payload was 12 C-band equivalent transponders supplied by Space Systems/Loral. History It was launched along Yamal-102, on 6 September 1999 at 16:36:00 UTC from Baikonur Site 81/23 by a Proton-K / Blok DM-2M directly to geostationary orbit. But a failure in the electrical system at solar panel deployment meant that it was lost right after the successful launch. Rename of Yamal-102 After Yamal-101 failure, Gazprom Space Systems registered Yamal-102 as Yamal-101. This has caused significant confusion but the records are clear that the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gazprom
PJSC Gazprom ( rus, Газпром, , ɡɐzˈprom) is a Russian majority state-owned multinational energy corporation headquartered in the Lakhta Center in Saint Petersburg. As of 2019, with sales over $120 billion, it was ranked as the largest publicly listed natural gas company in the world and the largest company in Russia by revenue. In the 2020 ''Forbes'' Global 2000, Gazprom was ranked as the 32nd largest public company in the world. The Gazprom name is a contraction of the Russian words ''gazovaya promyshlennost'' (, gas industry). In January 2022, Gazprom displaced Sberbank from the first place in the list of the largest companies in Russia by market capitalization. Gazprom is vertically integrated and is active in every area of the gas industry, including exploration and production, refining, transport, distribution and marketing, and power generation. In 2018, Gazprom produced twelve percent of the global output of natural gas, producing 497.6 billion cubic meters ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Yamal 101
Yamal-101 (Russian language, Russian: ) was a geostationary orbit, geostationary communications satellite operated by Gazprom Space Systems and built by Energia (corporation), RSC Energia. It was, along with Yamal-102 the first communications satellite of the Yamal (satellite constellation), Yamal programme and the first iteration of the USP (satellite bus), USP Bus. It was a satellite with 2200 watts of power (1300 watts available for the payload) on an unpressurized bus. It had eight SPT-100, SPT-70 Electrically powered spacecraft propulsion, electric thrusters by OKB Fakel for Orbital station-keeping, station keeping. Its payload was 12 C band (IEEE), C-band equivalent Transponder (satellite communications), transponders supplied by SSL (company), Space Systems/Loral. History It was launched along Yamal-102, on 6 September 1999 at 16:36:00 Coordinated Universal Time, UTC from Baikonur Cosmodrome, Baikonur Baikonur Cosmodrome Site 81, Site 81/23 by a Proton-K / Blok D , Blo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Solar Panels On Spacecraft
Spacecraft operating in the inner Solar System usually rely on the use of power electronics-managed photovoltaic solar panels to derive electricity from sunlight. Outside the orbit of Jupiter, solar radiation is too weak to produce sufficient power within current solar technology and spacecraft mass limitations, so radioisotope thermoelectric generators (RTGs) are instead used as a power source.NASA JPL Publication: Basics of Space Flight, Chapter 11. Typical Onboard Systems, Electrical Power Supply and Distribution Subsystems, History The first practical silicon-based solar cells were introduced by Bell Labs in April 1954. They were initially about 6% efficient, but improvements began to raise this number almost immediately. Bell had been interested in the idea as a system to provide power at remote telephone repeater stations, but the cost of the devices was far too high to be practical in this role. Aside from small experimental kits and uses, the cells remained largely unus ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Graveyard Orbit
A graveyard orbit, also called a junk orbit or disposal orbit, is an orbit that lies away from common operational orbits. One significant graveyard orbit is a supersynchronous orbit well beyond geosynchronous orbit. Some satellites are moved into such orbits at the end of their operational life to reduce the probability of colliding with operational spacecraft and generating space debris. Overview A graveyard orbit is used when the change in velocity required to perform a de-orbit maneuver is too large. De-orbiting a geostationary satellite requires a delta-v of about , whereas re-orbiting it to a graveyard orbit only requires about . For satellites in geostationary orbit and geosynchronous orbits, the graveyard orbit is a few hundred kilometers beyond the operational orbit. The transfer to a graveyard orbit beyond geostationary orbit requires the same amount of fuel as a satellite needs for about three months of stationkeeping. It also requires a reliable attitude control d ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Transponder (satellite Communications)
A communications satellite's transponder is the series of interconnected units that form a communications channel between the receiving and the transmitting antennas. It is mainly used in satellite communication to transfer the received signals. A transponder is typically composed of: * an input band-limiting device (an input band-pass filter), * an input low-noise amplifier (LNA), designed to amplify the signals received from the Earth station (normally very weak, because of the large distances involved), * a frequency translator (normally composed of an oscillator and a frequency mixer) used to convert the frequency of the received signal to the frequency required for the transmitted signal, * an output band-pass filter, * a power amplifier (this can be a traveling-wave tube or a solid-state amplifier). Most communication satellites are radio relay stations in orbit and carry dozens of transponders, each with a bandwidth of tens of megahertz. Most transponders operate on a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Orbital Station-keeping
In astrodynamics, orbital station-keeping is keeping a spacecraft at a fixed distance from another spacecraft or celestial body. It requires a series of orbital maneuvers made with thruster burns to keep the active craft in the same orbit as its target. For many low Earth orbit satellites, the effects of non-Keplerian forces, i.e. the deviations of the gravitational force of the Earth from that of a homogeneous sphere, gravitational forces from Sun/Moon, solar radiation pressure and air drag, must be counteracted. The deviation of Earth's gravity field from that of a homogeneous sphere and gravitational forces from the Sun and Moon will in general perturb the orbital plane. For a sun-synchronous orbit, the precession of the orbital plane caused by the oblateness of the Earth is a desirable feature that is part of mission design but the inclination change caused by the gravitational forces of the Sun and Moon is undesirable. For geostationary spacecraft, the inclination change ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
OKB Fakel
EDB Fakel (Russian ''ОКБ "Факел"'') is a Russian electric propulsion system development company. It is located in Kaliningrad in Kaliningrad Oblast. It was founded in 1955 as a ''Propulsion laboratory'' of the Soviet Academy of Sciences; in 1962 it obtained status of Design Bureau, OKB.Roskosmosbr>information/ref> Overview Fakel specializes in spacecraft attitude control thrusters, ion engines and plasma sources. It is a world leader in the field of Hall thruster development and a leading Russian developer and manufacturer of electric propulsion systems. The company's third-generation electric propulsion system SPT-100 has been certified in accordance with western standards and the company is actively marketing the system to foreign customers. The company has 960 employees. Flight missions Many companies have used Fakel electrically powered spacecraft propulsion systems on their hardware flown in space. Company's hardware were used on SESAT 1, Alphasat, SMART-1, L ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Electrically Powered Spacecraft Propulsion
Spacecraft electric propulsion (or just electric propulsion) is a type of spacecraft propulsion technique that uses electrostatic or electromagnetic fields to accelerate mass to high speed and thus generate thrust to modify the velocity of a spacecraft in orbit. The propulsion system is controlled by power electronics. Electric thrusters typically use much less propellant than chemical rockets because they have a higher exhaust speed (operate at a higher specific impulse) than chemical rockets.Choueiri, Edgar Y. (2009New dawn of electric rocket''Scientific American'' 300, 58–65 Due to limited electric power the thrust is much weaker compared to chemical rockets, but electric propulsion can provide thrust for a longer time. Electric propulsion was first successfully demonstrated by NASA and is now a mature and widely used technology on spacecraft. American and Russian satellites have used electric propulsion for decades. , over 500 spacecraft operated throughout the Sola ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
SPT-100
SPT-100 is a Hall-effect ion thruster, part of the SPT-family of thrusters. SPT stands for ''Stationary Plasma Thruster''. It creates a stream of electrically charged xenon ions accelerated by an electric field and confined by a magnetic field. The thruster is manufactured by Russian OKB Fakel, and was first launched onboard Gals-1 satellite in 1994. In 2003 Fakel debuted a second generation of the thruster, called SPT-100B, and in 2011 it presented further upgrades in SPT-100M prototypes. As of 2011 SPT-100 thrusters were used in 18 Russian and 14 foreign spacecraft, including IPSTAR-II, Telstar-8 and Ekspress A and AM constellations. Specifications See also * PPS-1350 PPS-1350 is a Hall-effect thruster, a kind of ion propulsion system for spacecraft. It was used in the SMART-1 mission to the moon and one geostationary satellites: Inmarsat-4A F4. It creates a stream of electrically charged xenon ions acceler ... Stationary plasma thrustersPDF) References {{Reflist ... [...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] |
