l13_ff_3_orbits

l13_ff_3_orbits - Trajectory Design For A Visible...

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Trajectory Design For A Visible Trajectory Design For A Visible Geosynchronous Earth Imager Geosynchronous Earth Imager Edmund M. C. Kong SSL Graduate Research Assistant Prof David W. Miller Director, MIT Space Systems Lab Dr. Raymond J. Sedwick Postdoctoral Associate, MIT Space Systems Lab AIAA Space Technology Conference & Exposition Albuquerque, New Mexico 30 September, 1999
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Space Systems Laboratory Massachusetts Institute of Technology Introduction Introduction Objective : To compare the different imaging configurations for a To compare the different imaging configurations for a Separated Spacecraft Interferometer operating from an Separated Spacecraft Interferometer operating from an Earth’s orbit Earth’s orbit Outline : Interferometric requirements & Orbit Selection Equations of Motions (Hill’s Equations) Steered Planar Array Propellant Free Array: Collector S/C Results Summary
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Space Systems Laboratory Massachusetts Institute of Technology Interferometric Interferometric Requirements & Orbit Selection Requirements & Orbit Selection Interferometric Requirements: Reqt 1. Equal science light pathlength for visible imaging Reqt 2. Axi-symmetric angular resolution about LOS Far-field assumption Array sees planar wavefronts from targets y x z Orbit Selection: Geosynchronous Higher altitude, lower perturbative effects (eg. J 2 )
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Space Systems Laboratory Massachusetts Institute of Technology Equations of Motions Equations of Motions Assumption : First order perturbation about natural circular Keplerian orbit ( c r o s - a n g e ) z x N y ze i t h d v l y S z n z a x n y a y n x n x a z y x 2 2 2 2 3 + = + = = & & & & & & & & dt a a a life T z y x + + = 0 2 2 2 V Hill’s Equations : Total Spacecraft Velocity Increment : Example : V required to hold a spacecraft stationary at (x,y,z) 2 2 2 9 n V z x T life + = V required : Spacecraft instantaneous acceleration : 0 = y a z n a z 2 = x n a x 2 3 =
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Space Systems Laboratory Massachusetts Institute of Technology DSS Architecture 1 DSS Architecture 1
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This note was uploaded on 11/08/2011 for the course AERO 16.851 taught by Professor Ldavidmiller during the Fall '03 term at MIT.

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l13_ff_3_orbits - Trajectory Design For A Visible...

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