Misplaced Pages

#392607

20-655: The RADARSAT Constellation Mission ( RCM ) is a three-spacecraft fleet of Earth observation satellites operated by the Canadian Space Agency . The RCM's goal is to provide data for climate research and commercial applications including oil exploration, fishing, shipping, etc. With satellites smaller than RADARSAT-2 , the RCM will provide new applications—made possible through the constellation approach —as well as continuing to provide C-band radar data to RADARSAT-2 users. One of its most significant improvements

40-571: A Falcon 9 rocket. Originally booster B1050 was planned to be used for this mission. However, after the failed landing of B1050, B1051 was used in this mission. Working alongside industry partners, the Canadian Space Agency ( CSA ) is in charge of mission planning and operations from their headquarters in Saint-Hubert, Quebec . The project was accepted given these three objectives would be met: deliver C-band data to users within

60-540: A relatively low altitude. Most orbit at altitudes above 500 to 600 kilometers (310 to 370 mi). Lower orbits have significant air-drag , which makes frequent orbit reboost maneuvers necessary. The Earth observation satellites ERS-1, ERS-2 and Envisat of European Space Agency as well as the MetOp spacecraft of EUMETSAT are all operated at altitudes of about 800 km (500 mi). The Proba-1 , Proba-2 and SMOS spacecraft of European Space Agency are observing

80-409: Is also required to have a multi-polarization function to increase flexibility in its function, as well as be able to capture subsidence in terrain using Phase Preserving ScanSAR Processing. The RADARSAT Constellation Mission (RCM) includes three identical Earth observation satellites. The prime contractor on the project is MDA and it was designed for three main uses: RADARSAT collects data mainly from

100-519: Is classified in accordance with ITU Radio Regulations (article 1) as follows: Fixed service (article 1.20) The allocation of radio frequencies is provided according to Article 5 of the ITU Radio Regulations (edition 2012). In order to improve harmonisation in spectrum utilisation, the majority of service-allocations stipulated in this document were incorporated in national Tables of Frequency Allocations and Utilisations which

120-664: Is in its operational use of synthetic-aperture radar (SAR) data. The primary goal of RCM is to provide continuous C-band SAR data to RADARSAT-2 users, as SAR imagery at a high temporal resolution is required by several users in the Canadian government. Other improvements include more frequent area coverage of Canada and reduced risk of a service interruption. The RCM will provide the world's most advanced, comprehensive method of maintaining Arctic sovereignty, conducting coastal surveillance, and ensuring maritime security. The three satellites were launched on 12 June 2019 at 14:17 UTC on board

140-829: Is with-in the responsibility of the appropriate national administration. The allocation might be primary, secondary, exclusive, and shared. However, military usage, in bands where there is civil usage, will be in accordance with the ITU Radio Regulations. Reboost A reboost is the process of boosting the altitude of an artificial satellite in Low Earth Orbit in order to delay its atmospheric re-entry due to orbital decay . See also [ edit ] Orbital station-keeping International Space Station § Orbit Specific orbital energy § Applying thrust References [ edit ] ^ Stewart, Robert W. (1992-05-15). "Rocket Blasts Satellite Toward

160-422: The Canadian government, produce daily coverage for ice, ship, and oil spill detection, and meet financial constraints to minimize cost of the program. The Canadian Government will own the satellites and data and will be responsible for its dissemination. Several requirements were established for the RCM by the Canadian government. RCM is required to be able to access 95% of any point on the globe on an average day. It

180-610: The Earth from an altitude of about 700 km (430 mi). The Earth observation satellites of UAE, DubaiSat-1 & DubaiSat-2 are also placed in Low Earth orbits (LEO) orbits and providing satellite imagery of various parts of the Earth. To get global coverage with a low orbit, a polar orbit is used. A low orbit will have an orbital period of roughly 100 minutes and the Earth will rotate around its polar axis about 25° between successive orbits. The ground track moves towards

200-604: The Soviet Union on October 4, 1957. Sputnik 1 sent back radio signals, which scientists used to study the ionosphere . The United States Army Ballistic Missile Agency launched the first American satellite, Explorer 1 , for NASA's Jet Propulsion Laboratory on January 31, 1958. The information sent back from its radiation detector led to the discovery of the Earth's Van Allen radiation belts . The TIROS-1 spacecraft, launched on April 1, 1960, as part of NASA's Television Infrared Observation Satellite (TIROS) program, sent back

220-647: The current vegetation state to its long term average. For example, the 2002 oil spill off the northwest coast of Spain was watched carefully by the European ENVISAT , which, though not a weather satellite, flies an instrument (ASAR) which can see changes in the sea surface. Anthropogenic emissions can be monitored by evaluating data of tropospheric NO 2 and SO 2 . These types of satellites are almost always in Sun-synchronous and "frozen" orbits. A Sun-synchronous orbit passes over each spot on

SECTION 10

#1732797401393

240-455: The first television footage of weather patterns to be taken from space. In 2008, more than 150 Earth observation satellites were in orbit, recording data with both passive and active sensors and acquiring more than 10 terabits of data daily. By 2021, that total had grown to over 950, with the largest number of satellites operated by US-based company Planet Labs . Most Earth observation satellites carry instruments that should be operated at

260-460: The ground at the same time of day, so that observations from each pass can be more easily compared, since the Sun is in the same spot in each observation. A "frozen" orbit is the closest possible orbit to a circular orbit that is undisturbed by the oblateness of the Earth , gravitational attraction from the Sun and Moon, solar radiation pressure , and air drag . Terrain can be mapped from space with

280-525: The ground using radio, but fell short of the idea of using satellites for mass broadcasting and as telecommunications relays. The onset of the Cold War prompted the rapid development of Satellite launch systems and camera technology capable of sufficient Earth observation to garner intelligence on enemy military infrastructure and evaluate nuclear posture. Following the U-2 incident in 1960, which highlighted

300-408: The land surface of Canada and the oceans around the country. Its synthetic aperture radars (SAR) have a mass of 400 kg each, and a resolution of 1 × 3 m. As secondary payload, it includes Automatic Identification System for ships (AIS). Earth observation satellite The first occurrence of satellite remote sensing can be dated to the launch of the first artificial satellite, Sputnik 1 , by

320-728: The risks of aerial spying, the U.S. accelerated surveillance satellite programs like CORONA . Satellites largely replaced aircraft overflights for surveillance after 1960. A weather satellite is a type of satellite that is primarily used to monitor the weather and climate of the Earth . These meteorological satellites, however, see more than clouds and cloud systems. City lights, fires , effects of pollution , auroras , sand and dust storms , snow cover, ice mapping, boundaries of ocean currents , energy flows, etc., are other types of environmental information collected using weather satellites. Weather satellite images helped in monitoring

340-740: The use of satellites, such as Radarsat-1 and TerraSAR-X . According to the International Telecommunication Union (ITU), Earth exploration-satellite service (also: Earth exploration-satellite radiocommunication service ) is – according to Article 1.51 of the ITU Radio Regulations (RR) – defined as: A radiocommunication service between earth stations and one or more space stations , which may include links between space stations, in which: This service may also include feeder links necessary for its operation. This radiocommunication service

360-478: The volcanic ash cloud from Mount St. Helens and activity from other volcanoes such as Mount Etna . Smoke from fires in the western United States such as Colorado and Utah have also been monitored. Other environmental satellites can assist environmental monitoring by detecting changes in the Earth's vegetation, atmospheric trace gas content, sea state, ocean color, and ice fields. By monitoring vegetation changes over time, droughts can be monitored by comparing

380-445: The west 25° each orbit, allowing a different section of the globe to be scanned with each orbit. Most are in Sun-synchronous orbits . A geostationary orbit , at 36,000 km (22,000 mi), allows a satellite to hover over a constant spot on the earth since the orbital period at this altitude is 24 hours. This allows uninterrupted coverage of more than 1/3 of the Earth per satellite, so three satellites, spaced 120° apart, can cover

400-552: The whole Earth. This type of orbit is mainly used for meteorological satellites . Herman Potočnik explored the idea of using orbiting spacecraft for detailed peaceful and military observation of the ground in his 1928 book, The Problem of Space Travel . He described how the special conditions of space could be useful for scientific experiments. The book described geostationary satellites (first put forward by Konstantin Tsiolkovsky ) and discussed communication between them and

#392607