Engineering
Satellite-enabled drones have accelerated the provision of life-saving medical supplies at NHS hospitals in Scotland, boosting the country's efforts to combat COVID-19.
Jul 13, 2021
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6
Telecom
Valuable data is flowing rapidly from Earth observing satellites back to the planet, thanks to the most sophisticated laser communication network ever built.
Jun 24, 2021
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3
Telecom
Protected Satellite Communications (SatComs) exhibit specific characteristics such as security, intelligence, anti-jamming, and nuclear disaster survivability. They constitute one of the key research topics in modern communications. ...
Jun 22, 2021
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4
Internet
In recent months, people have reported seeing a parade of star-like points passing across the night sky. The formation is not extraterrestrial, or even astrophysical in origin, but is in fact a line of satellites, recently ...
Jun 11, 2021
1
516
Internet
When your Netflix stream drops out in the middle of a rainstorm, can you blame the wild weather?
Jun 10, 2021
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8
Machine learning & AI
Can you trust the map on your smartphone, or the satellite image on your computer screen?
Jun 2, 2021
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4
Engineering
An intelligent antenna developed by researchers at Waterloo Engineering has been successfully tested, a major milestone in a multi-year, multi-million-dollar project.
May 17, 2021
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8
Machine learning & AI
Skoltech scientists have created a new monitoring system for agricultural applications that performs real-time image segmentation aboard drones to identify hogweed. The research was published in a high-profile journal, IEEE ...
May 11, 2021
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21
Machine learning & AI
A fire in Central Park seems to appear as a smoke plume and a line of flames in a satellite image. Colorful lights on Diwali night in India, seen from space, seem to show widespread fireworks activity.
Apr 21, 2021
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84
Computer Sciences
Like superheroes capable of seeing through obstacles, environmental regulators may soon wield the power of all-seeing eyes that can identify violators anywhere at any time, according to a new Stanford University-led study. ...
Apr 19, 2021
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42
In the context of spaceflight, a satellite is an object which has been placed into orbit by human endeavor. Such objects are sometimes called artificial satellites to distinguish them from natural satellites such as the Moon.
The first artificial satellite, Sputnik 1, was launched by the Soviet Union in 1957. By 2009 thousands of satellites have been launched into orbit around the Earth. These originate from more than 50 countries and have used the satellite launching capabilities of ten nations. A few hundred satellites are currently operational, whereas thousands of unused satellites and satellite fragments orbit the Earth as space debris. A few space probes have been placed into orbit around other bodies and become artificial satellites to the Moon, Venus, Mars, Jupiter and Saturn.
Satellites are used for a large number of purposes. Common types include military (spy) and civilian Earth observation satellites, communication satellites, navigation satellites, weather satellites, and research satellites. Space stations and human spacecraft in orbit are also satellites. Satellite orbits vary greatly, depending on the purpose of the satellite, and are classified in a number of ways. Well-known (overlapping) classes include low Earth orbit, polar orbit, and geostationary orbit.
Satellites are usually semi-independent computer controlled systems. Satellite subsystems attend many tasks, such as power generation, thermal control, telemetry, attitude control and orbit control.
This text uses material from Wikipedia, licensed under CC BY-SA
