Have you ever wondered what is the meaning of the term LEO which is so popular recently and why? There are three most common satellite orbit distances used in satellite communication. They are named after the orbital distances from Eath’s surface:
An object in such an orbit has an orbital period equal to the Earth's rotational period, making it appear immobile to ground observers. It is 35,786 kilometers (22,236 miles) above the equator (42,164 kilometers in radius from Earth's center) and rotates in the same direction as the Earth.
TV Broadcasting, Internet, and Data Transfer are the most typical applications. However, it is confined to the coverage area of the satellite's transponder projection on Earth.
A Geocentric orbits range in altitude from 2,000 kilometers (1,200 miles) to 35,786 kilometers, slightly below geosynchronous orbit (22,236 mi). With an orbital period of roughly 12 hours, GPS satellites orbit at a height of 20,200 kilometers (12,600 miles).
These are used for spacecraft that are part of the Global Navigation Satellite System, such as GPS, GLONASS, Galileo, and BeiDou.But it is limited to orbital period; you need at least 3 satellite in order to keep communication.
The phrase LEO region also refers to the area of space below 2,000 km (1,200 mi) in altitude (about one-third of Earth's radius). Objects in orbit that pass through this zone are carefully tracked, even if their apogee is further out or they are sub-orbital, because they pose a collision danger to the many LEO satellites.
Most popular examples of use are The ISS (International Space Station), Iridium Satellite Phone services, Hubble Space Telescope, and the most famous of all SpaceX’s Starlink Project.
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