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Full-Text Articles in Astrodynamics
Orbit Determination For A Microsatellite Rendezvous With A Non-Cooperative Target, Brian L. Foster
Orbit Determination For A Microsatellite Rendezvous With A Non-Cooperative Target, Brian L. Foster
Theses and Dissertations
This study investigated the minimum requirements to establish a satellite tracking system architecture for a hostile "parasitic microsatellite" to rendezvous with a larger, non-cooperative target satellite. Four types of tracking systems and their capabilities were reviewed with emphasis on "low-technology" level and/or mobile systems which could be used by technologically unsophisticated state or non-state adversaries. With the tracking system architecture selected, simulated tracking data was processed with a non- linear least squares orbit determination filter to determine and/or update the target satellite's state vector.
Hybrid Control Strategies For Rapid, Large Angle Satellite Slew Maneuvers, David B. French
Hybrid Control Strategies For Rapid, Large Angle Satellite Slew Maneuvers, David B. French
Theses and Dissertations
This research investigated hybrid control strategies for rapid satellite pointing. First, a detailed computer simulation model of AFIT's SIMSAT satellite simulator was constructed. Control strategies were developed to enable the system to perform large-angle, 3-axis slewing maneuvers using a combination of both thrusters and reaction wheels. To handle the non-linear model, a State Dependent Riccati Equation controller was programmed and successfully controlled the computer-modeled satellite for any given slewing maneuver. A simpler PD controller was then programmed and demonstrated on the computer simulation of SIMSAT, using a combination of thruster and reaction wheel control inputs for large-angle single axis maneuvers …