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S8 Engenharia Aeroespacial |
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Title:
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ORBITAL MANEUVERS FOR THE CHINA-BRAZIL SATELLITE USING CONTINUOS THRUST
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Summary :
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THE OBJECTIVE OF THIS PAPER IS TO STUDY THE ORBITAL MANEUVERS THAT WILL HAVE TO BE PERFORMED BY THE CBERS (CHINA-BRAZIL EARTH RESOURCES SATELLITE) SATELLITE. THE CBERS IS A REMOTE SENSING SATELLITE THAT IS UNDER DEVELOPMENT BY CHINA AND BRAZIL. THIS SATELLITE IS PLANNED TO STAY IN A POLAR FROZEN ORBIT AND ORBITAL MANEUVERS WILL HAVE TO BE PERFORMED TO ACHIEVE AND KEEP ITS ORBITAL ELEMENTS IN A SPECIFIED RANGE. THIS PAPER WILL BE DEVOTED TO STUDY THE MANEUVERS REQUIRED BY THIS SATELLITE. AFTER A SEARCH IN THE LITERATURE AND ANALYSIS OF THE RESULTS AVAILABLE, ONE SELECTS A SCHEME OF SOLUTION TO THE PROBLEM, WHERE A HYBRID APPROACH IS USED AND THE DETERMINATION OF THE INITIAL VALUES OF THE LAGRANGE MULTIPLIERS (TO SOLVE THE EQUATIONS GIVEN BY THE FIRST ORDER NECESSARY CONDITIONS FOR A LOCAL MINIMUM) IS TRANSFORMED IN A DIRECT SEARCH PROBLEM. THE NUMERICAL SOLUTION OF THE PROBLEM IN EACH ITERATION IS REDUCED TO ONE OF NONLINEAR PROGRAMMING, WHICH IS THEN SOLVED WITH THE GRADIENT PROJECTION METHOD. THE SPACECRAFT IS SUPPOSED TO BE IN KEPLERIAN MOTION CONTROLLED BY THE THRUSTS, THAT ARE ASSUMED TO BE OF FIXED MAGNITUDE (EITHER LOW OR HIGH) AND OPERATING IN AN ON-OFF MODE. RESULTS OF SIMULATIONS ARE PRESENTED FOR SEVERAL CASE STUDIES. |
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Author :
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Prado, Antonio Bertachini
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Paper View :
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