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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 …
Linear Covariance Analysis For Gimbaled Pointing Systems, Randall S. Christensen
Linear Covariance Analysis For Gimbaled Pointing Systems, Randall S. Christensen
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
Linear covariance analysis has been utilized in a wide variety of applications. Historically, the theory has made significant contributions to navigation system design and analysis. More recently, the theory has been extended to capture the combined effect of navigation errors and closed-loop control on the performance of the system. These advancements have made possible rapid analysis and comprehensive trade studies of complicated systems ranging from autonomous rendezvous to vehicle ascent trajectory analysis. Comprehensive trade studies are also needed in the area of gimbaled pointing systems where the information needs are different from previous applications. It is therefore the objective of …