lecture11 - ECE2984 Lecture11:ORBITALPARAMETERS...

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ECE 2984 Lecture 11: ORBITAL PARAMETERS Joseph Baker (ECE Dept) Lecture 11: Orbital Parameters ECE 2984:Exploration of Space
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Course Syllabus ECE Department Syllabus for ECE 2984 Topic Percent 1. History of Space Science and the Modern Space Program 10% 2. The near Earth Space Plasma Environment 15% 3. Geomagnetic Activity and Space Weather Hazards 15% 4. Orbital Mechanics 10% 5. Launch, Propulsion, Re Entry 10% 6. Spacecraft Subsystems 10% 7. Remote Sensing and Applications 10% 8. Satellite Communications and Navigation 10% g 9. Space Mission Design and Management 10% TAL: 00% Joseph Baker (ECE Dept) Lecture 11: Orbital Parameters ECE 2984:Exploration of Space TOTAL: 100%
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This Lecture THIS LECTURE: Basic Orbits ewton’s ws d rbital echanics Newton s Laws and Orbital Mechanics Orbital Elements NEXT LECTURE: Orbital Maneuvers Joseph Baker (ECE Dept) Lecture 11: Orbital Parameters ECE 2984:Exploration of Space
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Orbital Considerations Spacecraft orbit selection important for: Power from solar panels Space Weather influences Thermal issues Attitude control Data downlink and ground tracking ropulsion and orbit maintenance Propulsion and orbit maintenance Payload requirements unch site and costs Joseph Baker (ECE Dept) Lecture 11: Orbital Parameters ECE 2984:Exploration of Space Launch site and costs
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Example (max eclipse) Inclined Noon-Midnight (partial eclipse) Eclipse Sun spacecraft relying on solar panels for power requires an orbit Terminator Orbit (no eclipse) - Twilight Joseph Baker (ECE Dept) Lecture 11: Orbital Parameters ECE 2984:Exploration of Space A spacecraft relying on solar panels for power requires an orbit with minimum time in the Earth’s shadow (eclipse)
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Basic Types of Orbits e basic orbit types are LEO (“Low rth”) MEO (“Mid rth”) Joseph Baker (ECE Dept) Lecture 11: Orbital Parameters ECE 2984:Exploration of Space The basic orbit types are LEO (Low Earth ), MEO (M id Earth ), GEO (“Geosynchronous”), and HEO (“Highly Elliptical”) Orbits.
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Geostationary Orbit (GEO) At an altitude of 35,786 km the orbital period exactly matches Earth’s rotation. This means that the spacecraft “hovers” over a fixed point on the Earth surface. Joseph Baker (ECE Dept) Lecture 11: Orbital Parameters ECE 2984:Exploration of Space This is a useful orbit for continuous Earth observation (e.g. weather satellites).
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Low Earth Orbit (LEO) A spacecraft at an altitude less than 2000km is in Low Earth Orbit (LEO). is is useful for closer view of the Earth for imaging and communications Joseph Baker (ECE Dept) Lecture 11: Orbital Parameters ECE 2984:Exploration of Space This is useful for closer view of the Earth for imaging and communications. A disadvantage is that the spacecraft is not in one place for very long.
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Orbital Motion When a baseball player throws a ball gravity ventually ulls e all ward e ound eventually pulls the ball toward the ground A fast throw will travel farther.
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This note was uploaded on 09/19/2011 for the course ENGE 1114 taught by Professor Twknott during the Fall '06 term at Virginia Tech.

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lecture11 - ECE2984 Lecture11:ORBITALPARAMETERS...

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