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Space Domain Awareness
Space domain awareness is the study and monitoring of satellites orbiting the Earth. It involves the detection, tracking, cataloging and identification of artificial objects, i.e. active/inactive satellites, spent rocket bodies, or fragmentation debris. Aims Space domain awareness accomplishes the following: * Predicting when and where a decaying space object will re-enter the Earth's atmosphere; * Preventing a returning space object, which to radar looks like a missile, from triggering a false alarm in missile-attack warning sensors; * Charting the present position of space objects and plot their anticipated orbital paths; * Detecting new man-made objects in space; * Producing a running catalogue of man-made space objects; * Determining which country owns a re-entering space object; * Informing countries whether or not objects may interfere with satellites and International Space Station orbits; * Providing data for future anti-satellite weapons systems. Systems Systems i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Orbit
In celestial mechanics, an orbit is the curved trajectory of an object such as the trajectory of a planet around a star, or of a natural satellite around a planet, or of an artificial satellite around an object or position in space such as a planet, moon, asteroid, or Lagrange point. Normally, orbit refers to a regularly repeating trajectory, although it may also refer to a non-repeating trajectory. To a close approximation, planets and satellites follow elliptic orbits, with the center of mass being orbited at a focal point of the ellipse, as described by Kepler's laws of planetary motion. For most situations, orbital motion is adequately approximated by Newtonian mechanics, which explains gravity as a force obeying an inverse-square law. However, Albert Einstein's general theory of relativity, which accounts for gravity as due to curvature of spacetime, with orbits following geodesics, provides a more accurate calculation and understanding of the exact mechanics o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Space Surveillance Telescope
The Space Surveillance Telescope (SST) is a military telescope for detecting, tracking and cataloguing satellites, near-Earth objects and space debris. SST achieved first light in 2011 at the White Sands Missile Range, New Mexico, United States. In 2017, SST was dismantled and moved to the Harold E. Holt Naval Communication Station, Exmouth, Western Australia. From there it will observe the Southern Celestial Hemisphere and collect data for the US Space Surveillance Network. SST achieved first light in Australia on March 5, 2020. SST entered initial operational capability on October 4th, 2022 and is operated by the Royal Australian Air Force, 1 Remote Sensor Unit under the command and control (C2) of the U.S. Space Force. Purpose SST enables the military to better track and identify objects and threats in space including space debris, as well as predict and avoid potential collisions. Whether it is space traffic management or the protection of critical space-based capab ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Space Technology
Space technology is technology for use in outer space, in travel (''astronautics'') or other activities beyond Earth's atmosphere, for purposes such as spaceflight, space exploration, and Earth observation. Space technology includes space vehicles such as spacecraft, satellites, space stations and orbital launch vehicles; deep-space communication; in-space propulsion; and a wide variety of other technologies including support infrastructure equipment, and procedures. The space environment is a sufficiently novel environment that attempting to work in it often requires new tools and techniques. Many common everyday services for terrestrial use such as weather forecasting, remote sensing, satellite navigation systems, satellite television, and some long-distance communications systems critically rely on space infrastructure. Of the sciences, astronomy and Earth science benefit from space technology. New technologies originating with or accelerated by space-related endeavors are ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Silentium Defence Passive Radar For SDA - Low Resolution 2
Silentium is a Finnish gothic metal band. The band was formed in 1995 and it originates from Jämsänkoski, Finland. Keyboardist Sami Boman and original vocalist Matti Aikio created Silentium by adding violin player Jani Laaksonen, guitar players Toni Lahtinen and Juha Lehtioksa and drummer Jari Ojala into the line-up of their previous band Funeral. Silentium's first demos and EPs were released in tape format, and their albums have only been released in Europe and some Asian countries, although Silentium's last single "Dead Silent" has been uploaded to some legal Finnish music websites for worldwide download. The addition of singer Riina Rinkinen to the band in 2006 was welcomed by Canadian and German reviewers. Members Current members * Juha Lehtioksa - guitars (1995–present) * Sami Boman - keyboards, add. brass samples, backing vocals (1995–present) * Riina Rinkinen - female vocals (2004–present) * Janne Ojala - drums (1999–2004, 2014–present) * Aapeli Kivimäk ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
National Reconnaissance Office
The National Reconnaissance Office (NRO) is a member of the United States Intelligence Community and an agency of the United States Department of Defense which designs, builds, launches, and operates the reconnaissance satellites of the U.S. federal government, and provides satellite intelligence to several government agencies, particularly signals intelligence (SIGINT) to the NSA, imagery intelligence (IMINT) to the NGA, and measurement and signature intelligence (MASINT) to the DIA. NRO is considered, along with the Central Intelligence Agency (CIA), National Security Agency (NSA), Defense Intelligence Agency (DIA), and National Geospatial-Intelligence Agency (NGA), to be one of the "big five" U.S. intelligence agencies. The NRO is headquartered in Chantilly, Virginia, south of the Washington Dulles International Airport. The Director of the NRO reports to both the Director of National Intelligence and the Secretary of Defense. The NRO's federal workforce is a hybrid orga ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Swan Reach, South Australia
Swan Reach is a river port in South Australia 127 km north-east of Adelaide on the Murray River between Blanchetown and Mannum in South Australia. It is on the left bank of the river. The Swan Reach Ferry is a cable ferry crossing operated by the state government as part of the state's road network. Swan Reach, with all parts below Lock #1, is also one of the lowest parts of the river. It is currently (2009–2010) about 1.5 metres below its normal level. At the , Swan Reach had a population of 283. History Swan Reach was first settled in the 1850s and was originally the largest of five sheep and cattle stations in the area. It soon became one of the first riverboat ports in South Australia and was a loading port for grain and wool. Swan Reach Mission was established by the United Aborigines Mission (UAM) in 1926 to provide a Christian education to Aboriginal children. It was closed in 1946 due to frequent flooding of the area, and the UAM opened the Gerard Mission ne ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Passive Radar
Passive radar systems (also referred to as passive coherent location, passive surveillance systems, and passive covert radar) encompass a class of radar systems that detect and track objects by processing reflections from non-cooperative sources of illumination in the environment, such as commercial broadcast and communications signals. It is a specific case of bistatic radar, the latter also including the exploitation of cooperative and non-cooperative radar transmitters. Introduction Conventional radar systems comprise a colocated transmitter and receiver, which usually share a common antenna to transmit and receive. A pulsed signal is transmitted and the time taken for the pulse to travel to the object and back allows the range of the object to be determined. In a passive radar system, there is no dedicated transmitter. Instead, the receiver uses third-party transmitters in the environment and measures the time difference of arrival between the signal arriving directly from ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Silentium Defence
Silentium is a Finnish gothic metal band. The band was formed in 1995 and it originates from Jämsänkoski, Finland. Keyboardist Sami Boman and original vocalist Matti Aikio created Silentium by adding violin player Jani Laaksonen, guitar players Toni Lahtinen and Juha Lehtioksa and drummer Jari Ojala into the line-up of their previous band Funeral. Silentium's first demos and EPs were released in tape format, and their albums have only been released in Europe and some Asian countries, although Silentium's last single "Dead Silent" has been uploaded to some legal Finnish music websites for worldwide download. The addition of singer Riina Rinkinen to the band in 2006 was welcomed by Canadian and German reviewers. Members Current members * Juha Lehtioksa - guitars (1995–present) * Sami Boman - keyboards, add. brass samples, backing vocals (1995–present) * Riina Rinkinen - female vocals (2004–present) * Janne Ojala - drums (1999–2004, 2014–present) * Aapeli Kivimäk ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Space Situational Awareness Programme
The Space Safety Programme, formerly the Space Situational Awareness (SSA) programme, is the European Space Agency's (ESA) initiative to monitor hazards from space, determine their risk, make this data available to the appropriate authorities and where possible, mitigate the threat. The SSA Programme was designed to support Europe's independent space access and utilization through the timely and accurate information delivery regarding the space environment, particularly hazards to both in-orbit and ground infrastructure. In 2019 it evolved into the present Space Safety Programme with an expanded focus, also including missions and activities to mitigate and prevent dangers from space. The programme is split into four main segments: * Space weather: monitoring the Sun, the solar wind, and in Earth's magnetosphere, ionosphere and thermosphere, that can affect spaceborne and ground-based infrastructure or endanger human life or health. This data is processed by thSpace Weather Servi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bi-static Radar
Bistatic radar is a radar system comprising a transmitter and receiver that are separated by a distance comparable to the expected target distance. Conversely, a conventional radar in which the transmitter and receiver are co-located is called a monostatic radar. A system containing multiple spatially diverse monostatic or bistatic radar components with a shared area of coverage is called '' multistatic radar''. Many long-range air-to-air and surface-to-air missile systems use semi-active radar homing, which is a form of bistatic radar. Types Pseudo-monostatic radars Some radar systems may have separate transmit and receive antennas, but if the angle subtended between transmitter, target and receiver (the bistatic angle) is close to zero, then they would still be regarded as monostatic or pseudo-monostatic. For example, some very long range HF radar systems may have a transmitter and receiver which are separated by a few tens of kilometres for electrical isolation, but ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Graves (system)
GRAVES (french: Grand Réseau Adapté à la Veille Spatiale) is a French radar-based space surveillance system, akin to the American Air Force Space Surveillance System. Using radar measurements, the French Air Force is able to spot satellites orbiting the Earth and determine their orbit. The GRAVES system took 15 years to develop, and became operational in November, 2005. GRAVES is also a contributing system to the European Space Agency's Space Situational Awareness Programme (SSA). GRAVES is a bistatic radar system using Doppler and directional information to derive the orbits of the detected satellites. Its operating frequency is 143.050 MHz, with the transmitter being located on a decommissioned airfield near Broye-lès-Pesmes at and the receiver at a former missile site near Revest du Bion on the Plateau d'Albion at . Data processing and generation of satellite orbital elements is performed at the Balard Air Complex in Paris, . See also * Space Situational Awareness ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Krona Space Object Recognition Station
Krona space object recognition station ( rus, Радиооптический комплекс распознавания космических объектов «Крона», Radiooptichesky Kompleks raspoznavaniya kosmicheskikh obektov "Krona") is a Russian military complex which is used to identify objects (artificial satellites) in outer space using telescopes and radar. It is part of the Centre for Outer Space Monitoring of the Russian Space Forces. The first Krona is near the village of Zelenchukskaya in Karachay-Cherkessia, North Caucasus. There is another under construction in the Russian Far East called Krona-N, near Nakhodka in Primorsky Krai. In 2007, the then commander of the Russian Space Forces Vladimir Popovkin said that the Nakhodka Krona would start in 2008, however there were no subsequent announcements. The Caucasian Krona consists of two complexes - an optical one located on Chapal mountain () above 2,000 metres and a radar installation 30 km away at ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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