1 I n t r o d u c t i o n Large space structures such as antennas or space stations will be very flexible, not only because of the high cost of transportation of structures from earth to space, but also because they will be constructed or deployed in orbit and will not need to withstand large launching and gravity loads. However, when a space structure is very flexible, its active control syste...

This paper designs a low-frequency learning adaptive control architecture for a flexible spacecraft. The proposed architecture involves a new and novel controller structure involving a modification term in the update law. In particular, this modification term filters out the high-frequency content contained in the update law while preserving stability of the system error dynamics. This key feat...

In this paper, the problem of attitude control of a 1D non-linear exible spacecraft is investigated. Three controllers are presented. The rst is a non-linear dynamic inversion, the second is a linear -synthesis and the third is a composition of dynamic inversion and a -synthesis controller. It is assumed only one reaction wheel is used. Actuator saturation is considered in the design of control...

Installation dynamics, optimal thruster propulsion, and specific impulse thrust for reignitable fuel motors to regulate pointing error is obtained for geosynchronous (e.g., the Indian National Satellite, INSAT–1B), and sunsynchronous (e.g., the Indian Earth Resource Satellite, IRS–1) satellites parked in transfer orbits. Filter dynamics for slow and fast terrestrial system are obtained. Design ...

Title of thesis: ROBOTIC SIMULATION OF FLEXIBLE-BODY SPACECRAFT DYNAMICS IN A SATELLITE SERVICING TESTBED Justin Cory Brannan Master of Science, 2014 Thesis directed by: Dr. Craig Carignan Department of Aerospace Engineering Satellite failures that once led to end-of-life may eventually be addressed using robotic servicing platforms. The ability to model and simulate the physical interaction be...

This paper considers the problem of attitude synchronization control of a group of flexible spacecraft under an undirected communication graph and in the absence of measurements of both modal variables and spacecraft angular velocities. To solve this problem, a nonlinear observer is introduced to estimate the unmeasurable modal variables and spacecraft angular velocities. Then, the backstepping...