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Summer Seminar Series | Justin Kernot and Bradley Kuiack
June 22, 2017
| Cost: | Free |
Justin Kernot: A consequence of using classical control theory in real systems is that the stability of the closed loop system cannot be guaranteed if there are any uncertainties associated with the mathematical model describing the plant. To address this problem, robust control theory was developed to ensure that the system will remain stable in the presence of such uncertainties. A common method of synthesizing a robust controller is by solving the H-infinity optimization problem; which minimizes the closed loop disturbance sensitivity and control effort while ensuring robust stability. This presentation covers the fundamentals of robust control theory and presents a worked example of generating an H-infinity controller for the SPOT platforms.
Bradley Kuiack: One of the challenges of autonomous guidance and control of formation flying is related to the on-board prediction of the relative motion between both spacecraft, which has to remain accurate over long propagation periods and be valid for large separation distances on highly elliptical orbits. In this context, this presentation addresses the problem of nonlinear analytical guidance for spacecraft formation flying reconfiguration maneuvers. Specifically, a nonlinear analytical solution for predicting the radial, along-track, and cross-track relative motion on J2-perturbed elliptical orbits is presented and the solution is used in a back-propagation scheme for closed-loop guidance purposes.