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The gps satellites are at roughly half geo height 20 000km vs 40 000km.
Gps satellite orbit speed. View pre launch news release 3. View pre launch news release 2. View space force. If they were higher their antenna gain could be more the beam is narrower and still covers the earth and besides.
In september 2016 the air force awarded lockheed martin a contract option for two more block iiia satellites setting the total number of gps iiia satellites to ten. Relative to the earth gps satellites orbit twice in a sidereal day the length of time the stars instead of the sun take to return to the original position in the sky. The fourth gps iii satellite is scheduled to launch on friday october 2. It is one of the global navigation satellite systems gnss that provides geolocation and time information to a gps receiver anywhere on or near the earth where there is an unobstructed line of sight to.
The transmitted power requirement really isn t an issue. On december 23 2018 the first gps iii satellite was launched aboard a spacex falcon 9. The speed can t vary as long as the satellite has a constant orbital radius that is as long as it s going around in circles. The global positioning system gps originally navstar gps is a satellite based radionavigation system owned by the united states government and operated by the united states space force.
This equation holds for any orbiting object where the attraction is the force of gravity whether it s a human made satellite orbiting the earth or the earth orbiting the sun. The launch window opens at 9 43 p m. Since a sidereal day is about 4 minutes shorter than a solar day a gps satellite orbits once every 11 hours and 58 minutes.
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