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Information Seminar Paper

Title

NEW ACCURATE GUIDANCE METHOD FOR A ROCKET IN THE PRESENCE OF TRAJECTORY UNCERTAINTIES BY USING NEURAL NETWORKS

Writers

 MOUSAVIYANFARD DEHKORDI SAYED KAZEM | GHAHRAMANI NEMAT OLLAH

Pages

 Start Page | End Page

Abstract

 THIS PAPER EXAMINES THE PROBLEM OF ROCKET TRAJECTORY UNCERTAINTY DUE TO UNCERTAIN THRUST OF THE ROCKET IN THE SIMPLE FORM. SO FAR, BEEN LESS ATTENTION TO THIS ISSUE.THE GOAL IS TO FIND A WAY TO CORRECT THE ROCKET TRAJECTORY IN THE PRESENCE OF THRUST UNCERTAINTY IN THE LAUNCH PHASE. FIRST, THE SIMULATION OF ROCKET MOTION IN TWO DIMENSIONS IS PERFORMED. THEN THE EFFECTS OF THRUST CHANGES ARE EXAMINED. IT ASSUMED THAT THE ONLY CONTROLLING FACTOR, IS THE PITCH ANGLE OF THE ROCKET. TO COMPUTE THE CORRECT PITCH ANGLES FOR VARIOUS UNCERTAINTIES AT THE START OF MIDCOURSE PHASE, RANGE ERROR FUNCTION IS DEFINED. THE ROOTS OF THIS FUNCTION IS CALCULATED BY USING BISECTION METHOD. AFTER OBTAINING THE CORRECT PITCH ANGLES, A TWO-LAYER FEED FORWARD NEURAL NETWORK IS DESIGNED. THE INPUTS OF THIS NETWORK ARE RANGE, HEIGHT, VELOCITY AND INCORRECT PITCH ANGLE OF THE ROCKET IN THE BEGINNING OF MIDCOURSE PHASE, AND THE OUTPUT IS THE CORRECT PITCH ANGLE. FINALLY, MATHEMATICAL FUNCTION OF DESIGNING NETWORK BE EXTRACTED. SIMULATION RESULTS SHOW THE EFFECTIVENESS OF THE PROPOSED METHOD.

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