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Lunar Descent Trajectory. February 5 th , 2009. Descent Trajectory. Goal Determine trajectory, attitude, burn time, range & altitude EOM Derivation Assumptions Moon/spacecraft system, spherical & does not rotate, point masses 2-D problem
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Lunar Descent Trajectory February 5th, 2009 [John Aitchison] [Mission Ops]
Descent Trajectory [John Aitchison] [Mission Ops] • Goal • Determine trajectory, attitude, burn time, range & altitude • EOM Derivation Assumptions • Moon/spacecraft system, spherical & does not rotate, point masses • 2-D problem • T/m varies only with changing propellant mass (no throttling)
Useful Numbers [John Aitchison] [Mission Ops] • Variability with: • Vehicle Mass • Thrust Capability • Lunar Parking Orbit
Code (pg. 1) [John Aitchison] [Mission Ops]
Code (pg. 2) [John Aitchison] [Mission Ops]
Code (pg. 3) [John Aitchison] [Mission Ops]
Code (pg. 4) [John Aitchison] [Mission Ops]
Coordinate System [John Aitchison] [Mission Ops]
Coordinate System Definitions [John Aitchison] [Mission Ops]
Assumptions [John Aitchison] [Mission Ops]
Calculations (pg. 1) [John Aitchison] [Mission Ops]
Calculations (pg. 2) [John Aitchison] [Mission Ops]
Calculations (pg. 3) [John Aitchison] [Mission Ops]
Calculations (pg. 4) [John Aitchison] [Mission Ops]