UNIVERSE
SATELLITESICY BODIES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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GPS satellites are closer to Earth and are moving slower than the ISS
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GPS satellites are closer to Earth and are moving faster than the ISS
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GPS satellites are farther from Earth and are moving faster than the ISS
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GPS satellites are farther from Earth and are moving slower than the ISS
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Detailed explanation-1: -GPS satellites fly in circular orbits at an altitude of 10, 900 nautical miles (20, 200 km) and with a period of 12 hours.
Detailed explanation-2: -GPS stands for Global Positioning System. DGPS stands for Differential Global Positioning. GPS and DGPS are used for satellite-based navigation systems. The primary difference between GPS and DGPS is that GPS has a worldwide coverage area for its equipment, yet, the DGPS’s instruments range is local.
Detailed explanation-3: -Medium Earth Orbit The semi-synchronous orbit is a near-circular orbit (low eccentricity) 26, 560 kilometers from the center of the Earth (about 20, 200 kilometers above the surface). A satellite at this height takes 12 hours to complete an orbit.
Detailed explanation-4: -Satellites in geostationary orbit (GEO) circle Earth above the equator from west to east following Earth’s rotation – taking 23 hours 56 minutes and 4 seconds – by travelling at exactly the same rate as Earth.
Detailed explanation-5: -To accomplish this, each of the 31 satellites emits signals that enable receivers through a combination of signals from at least four satellites, to determine their location and time. GPS satellites carry atomic clocks that provide extremely accurate time.