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- Orbits & Trajectories
- Chapter 3-2
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- Orbits are either
elliptical or circular
- Elliptical orbits have
a perigee and
an apogee
- The period is
the time it
takes to make one
complete orbit around
the earth
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- Perigee is the
closest to the
earth that the
satellite comes
- Apogee is the
furthest from the
earth that the
satellite goes
- an orbit 100 NM
from the earth
takes 1 hr 28 min to
complete
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4
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- Geosynchronous - satellite
stays stationed above
a point on
the earth’s surface - its period
is 24 hrs
- Polar - path that crosses the
North & South poles - can
view all of
the Earth’s surface
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- Sun-synchronous - polar orbit
that keeps satellite exposed to
constant sunlight
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- Low Earth Orbit - 90 - 400 NM - manned space flight, high
resolution, low launch
cost, short lived,
small FOV
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- Medium Earth Orbit - 400 - 19,000 NM - navigation
(GPS), lower resolution, higher
launch cost, large
radiation exposure
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- High Earth Orbit - above 19,000 NM -
communication, surveillance, weather, low
resolution, very high launch
cost, large FOV
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