What is Geosynchronous Earth Orbit (GEO)?

What is Geosynchronous Earth Orbit (GEO)?

• A. High orbit providing continuous coverage over one area.
• B. Low altitude orbit with rapid passes around the globe.
• C. Medium altitude orbit with partial global coverage.
• D. Deep-space orbit used for astronomy.

Answer: (A)

Geosynchronous orbit means the satellite’s orbital period matches Earth’s 24-hour rotation, so it stays over roughly the same region of the ground. At about 35,786 km above the equator, this high orbit provides a large, essentially fixed footprint, and if the orbit is equatorial (zero inclination) it appears stationary above that spot, which is ideal for constant communications links with a fixed ground antenna. The other descriptions describe fast passes from a low Earth orbit, partial or regional coverage from medium orbits, or a deep-space path used for astronomy, none of which capture the characteristic that GEO’s period matches Earth's rotation and offers steady coverage of a single area.

Geosynchronous orbit means the satellite’s orbital period matches Earth’s 24-hour rotation, so it stays over roughly the same region of the ground. At about 35,786 km above the equator, this high orbit provides a large, essentially fixed footprint, and if the orbit is equatorial (zero inclination) it appears stationary above that spot, which is ideal for constant communications links with a fixed ground antenna. The other descriptions describe fast passes from a low Earth orbit, partial or regional coverage from medium orbits, or a deep-space path used for astronomy, none of which capture the characteristic that GEO’s period matches Earth's rotation and offers steady coverage of a single area.