Satellites communicate by using radio waves to send signals to the antennas on the Earth. Navigational satellites help ships and planes navigate.

What do they do?

Others might fit … October 15, 2019. Some of these man-made objects, such as the International Space Station, are massive. Rescue satellites respond to radio distress signals (read this page for details).

The most famous are the Landsat series. The most obvious questions that come to mind are: Why are these satellites in totally different orbits?

Since Sputnik, several nations, led predominantly by the United States, Russia and China, have sent some 2,500 satellites into space [source: National Geographic]. Earth observation satellites check the planet for changes in everything from temperature to forestation to ice-sheet coverage. Uplinks and downlinks.

Communications satellites are "space mirrors" that can help us bounce radio, TV, Internet data, and other kinds of information from one side of Earth to the other. How do Satellites work? You might be surprised to know that there are almost 4,900 satellites orbiting the earth. The most famous are the GPS NAVSTAR satellites.

How satellites work A satellite is basically a self-contained communications system with the ability to receive signals from Earth and to retransmit those signals back with the use of a transponder —an integrated receiver and transmitter of radio signals.

We live our lives knowing that many satellites orbit our planet everyday, and that they are helping us in several ways. If you want to send something like a TV broadcast from one side of Earth to the other, there are three stages involved. How do communications satellites work?

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