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Full-Text Articles in Navigation, Guidance, Control and Dynamics
Autonomous Attitude Consensus For Nanosatellite Formations In Leo, Laird J. Mendelson
Autonomous Attitude Consensus For Nanosatellite Formations In Leo, Laird J. Mendelson
Master's Theses
Consensus strategies are examined as a possible approach to achieving attitude alignment for a large, close-proximity formation of nanosatellites in low earth orbit (LEO). An attitude-only distributed consensus approach is selected for further consideration due to its comparatively low data transmission requirements. The convergence of a connected network of satellites to the attitude agreement subspace under this control law is shown using a Lyapunov stability approach with a set of idealizing assumptions. A moderate-fidelity simulation demonstrates the performance of the control law under realistic conditions that violate those assumptions. Particular emphasis is placed on the conditions that arise from the …
Attitude Estimation For A Gravity Gradient Momentum Biased Nanosatellite, Arash Mehrparvar
Attitude Estimation For A Gravity Gradient Momentum Biased Nanosatellite, Arash Mehrparvar
Master's Theses
Attitude determination and estimation algorithms are developed and implemented in simulation for the Exocube satellite currently under development by PolySat at Cal Poly. A mission requirement of ±5˚ of attitude knowledge has been flowed down from the NASA Goddard developed payload, and this requirement is to be met with a basic sensor suite and the appropriate algorithms. The algorithms selected in this work are TRIAD and an Extended Kalman Filter, both of which are placed in a simulation structure along with models for orbit propagation, spacecraft kinematics and dynamics, and sensor and reference vector models. Errors inherent from sensors, orbit …