Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 39 for “"Space telescopes"”.
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Embedded Computing for Wavefront Control on Future Space Telescopes
Future space telescopes will use adaptive optics to suppress starlight to directly image and characterize exoplanets. A measurement using this technique may be the first to detect extraterrestrial life in the universe. However, the real-time execution of adaptive optics control algorithms places …
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Integrated modeling to facilitate control architecture design for lightweight space telescopes
… and systematic requirements of future space telescopes. New telescope systems are moving toward tighter optical performance requirements with lower mass and cost, creating an implicit conflict for currently designed systems. Therefore, new technology and telescope types must be …
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Reconfiguration methods for on-orbit servicing, assembly, and operations with application to space telescopes
… of tests (in simulation and on the International Space Station) to assess the control performance improvement after reconfiguration. Four applications were considered in this work, two hardware applications and two systems applications modeled through simulation. The objective of the SWARM …
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Ultrafast Laser Micromachining for Correction of Thin Optics for Next Generation X-ray Space Telescopes
… mirrors for future high performance X-ray space telescopes. The existing fabrication methods cannot achieve the required accuracy for individual mirror segments, and the high reflective coatings could distort the mirror figures beyond acceptable tolerance. As mirrors become thinner and more …
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Image collection optimization in the design and operation of lightweight, low areal-density space telescopes
Demand for space imagery has increased dramatically over the past several decades. Scientific and government agencies rely on Earth-observing space assets for a variety of functions, including mapping, agriculture, and intelligence. In recent years, online interactive mapping services have created …
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A decision-making framework to determine the value of on-orbit servicing compared to replacement of space telescopes
The Hubble Space Telescope has demonstrated that on-orbit servicing can provide significant benefits for scientific space programs. Specifically, servicing missions can replace failed components to keep spacecraft operational, and can upgrade onboard components to improve spacecraft performance. …
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Planar feasibility study for primary mirror control of large imaging space systems using binary actuators
… advancements in ground-based observatories and space telescopes. Latest trends in ground-based observatories have been ever increasing size of the primary mirror, providing much higher apertures for more powerful image captures. The same trend can be envisioned for space telescopes. In fact, …
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Non-deterministic design and analysis of parameterized optical structures during conceptual design
The next generation of space observatories will use larger mirrors while meeting tighter optical performance requirements than current space telescopes. The spacecraft designs must satisfy the drive for low-mass, low-cost systems, and be robust to uncertainty since design validation will be based …
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Fine surface control of flexible space mirrors using adaptive optics and robust control
Future space telescopes will contain lightweight, flexible, segmented mirrors. Traditional control approaches for mirror alignment and shape control may be inadequate due to flexibilities and low natural frequencies. Using adaptive optics for space telescopes presents a possible solution. This …
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Design and optimization of lightweight space telescope structures
… deeper into the universe, increasingly larger space telescopes will be needed to achieve the levels of resolution required to perform these missions. Due to this increase in size, increasing emphasis will be placed on designing lightweight, efficient structures in order to reduce structural …
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Estimation and control of flexible space structures for autonomous on-orbit assembly
… to autonomously assemble large structures in space is desirable for the construction of large orbiting solar arrays, interplanetary spacecraft, or space telescopes. One technique uses free-flying satellites to manipulate and connect elements of the structure. Since these elements are often …
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Luminous blue variable stars: exploring the mass-loss history through a multiwavelength analysis of their ejecta
… mid-IR to the radio, collected with different space telescopes and interferometric and single-dish telescopes. Among the most interesting results in this work there are: the discovery of a recently formed shell in one of our sources and the evidence that galactic and magellanic objects do not …
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A Ridge-fed Conical Horn Antenna for Small Satellites
… alternative vehicle for efficient and low cost space exploration has revolutionized the space research industry. The small physical size and other constraints owing to outer space applications has presented a myriad of exciting opportunities for antenna engineers to come up with alternative …
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Staged attitude-metrology pointing control and parametric integrated modeling for space-based optical systems
… in astronomy demands larger and more complex space imaging systems. This thesis presents the concepts developed for two different technologies that have the potential to contribute in improving the performance of space imaging systems. The first technology is precision pointing control …
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Design and shape control of lightweight mirrors for dynamic performance and athermalization
The next generation of space telescopes will need to meet increasingly challenging science goals. For these new systems to meet resolution goals, the collecting area of the primary mirror will need to be increased. However, current space telescope designs are reaching their limits in terms of size …
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The coordinated control of space robot teams for the on-orbit construction of large flexible space structures
Teams of autonomous space robots are needed for future space missions such as the construction of large solar power stations and large space telescopes in earth orbit. This work focuses on the control of teams of robots performing construction tasks such as manipulation and assembly of large space …
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Optical-level structural modelling of membrane mirrors for spaceborne telescopes
… Earth observation communities desire ever-larger space telescopes, but launch costs limit mass and technology limits size. Current research in large aperture mirrors largely supports deployed rigid optics, but efforts have already begun to develop technology that offers the possibility of a …
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Optimal placement of binary actuators in deformable optical systems
… correction in large optical systems such as space telescopes and ground-based solar-thermal concentrators. This Thesis will continue this exploration. The information-theoretic requirements of the corrective commands required in active optics will be explored to understand the dimensionality …
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Multivariable isoperformance methodology for precision opto-mechanical systems
Precision opto-mechanical systems, such as space telescopes, combine structures, optics and controls in order to meet stringent pointing and phasing requirements. In this context a novel approach to the design of complex, multi-disciplinary systems is presented in the form of a multivariable …
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Orbit and Attitude Control for (non-) Rotating Space-Based Telescopes Utilizing Reflectivity Control Devices
… there exists a need for novel methods that allow space telescopes to reduce fuel usage and satellite's volume and mass. To address fuel reduction and increase mission lifetime, reflectivity control devices (RCDs), or devices that are capable of regulating the effective force produced by Solar …
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