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Infrastructure

Satellites


2005 – Satellite Orbits

As geostationary (GSO) satellites remain in an essentially fixed position relative to the ground at all times, they can communicate with fixed ground stations continually. Medium Earth orbit (MEO) and…

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2005 – Satellite Overview

Satellites in use have four basic applications: communications, remote sensing, navigation, positioning and timing, and scientific experimentation (generally using a suite of sensors with variations of some or all of…

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2014 – Satellite Orbits

According to the Union of Concerned Scientists, a total of ## satellites were active at the end of 2014. These satellites are mostly located in low Earth orbit (LEO) between 200 and…

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2012 – Satellite Overview

In 2012, ## satellites were successfully launched on behalf of ## different countries and international organizations. There were ## active satellites in orbit at the end of 2012, according to…

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2013 – Satellite Overview

In 2013, ## satellites were successfully launched on behalf of ## different countries. Of these, ## were “microsatellites,” with a mass of less than 91 kilograms (200 pounds). These satellites…

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Ground Networks

Ground stations serve as the links between Earth and space, tying together terrestrial and space infrastructure. They track satellites and spacecraft, as well as communicate with and control satellites, probes,…

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