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 85 for “"Small Satellites"”.
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Maritime surveillance with small satellites
… primary research motivation is to examine how a small satellite like LAPAN-A2 and LAPAN-A3 that carries an AIS receiver and its optical camera involving in maritime surveillance. Those satellites are the first small satellite launched in 2015 and 2016, respectively, that carry AIS and optical …
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Optical communications for small satellites
Small satellites, particularly CubeSats, have become popular platforms for a wide variety of scientific, commercial and military remote sensing applications. Inexpensive commercial o the shelf (COTS) hardware and relatively low launch costs make these platforms candidates for deployment in large …
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Magnetic Stabilization of Nadir-Pointing Small Satellites
… and are inexpensive, they are attractive for small, inexpensive satellites in low Earth orbits. In this thesis we present averaging-based feedback control laws that achieve three-axis stabilized nadir-pointing attitude. Two types of nonlinear feedback control laws are proposed: full-state …
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A Ridge-fed Conical Horn Antenna for Small Satellites
<p>The increased popularity of small satellites such as CubeSats as an 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 …
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An attitude determination and control system for small satellites
… and control (ADC) system is presented for small satellite platforms. Using commercial-off-the-shelf sensors, reaction wheels, and magnetorquers which fit within the 3U CubeSat form factor, the system delivers arc-minute pointing precision. The ADC system includes a multiplicative extended …
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Study of optical propulsion concepts and techniques for small-satellites
… a higher-fidelity model of a recently envisioned small spacecraft propulsion system for precision pointing and proximity control. Plasmonic force propulsion harnesses solar light focused onto plasmon reactive sub-wavelength nanostructures to generate polarized oscillations of electrons on the …
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Electrospray Thrusters in Chemical-Electric Multimode Propulsion for Small Satellites
Propulsion for small spacecraft is typically one of two modes, chemical or electric. These modes offer complementary propulsive performance: chemical propulsion provides high thrust and low specific impulse, while electric propulsion provides the inverse. As such, having access to both modes on the …
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Commanding small satellites for simulated spacecraft inspections using augmented reality
Free-flying teleoperated satellites have been proposed as a replacement for astronaut extravehicular activities (EVA), such as inspection or maintenance, to reduce astronaut risk. A major concern for this type of operation is ensuring the human operator has sufficient spatial and temporal knowledge …
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Adaptive and Responsive Design Under Uncertainty for Resource-Constrained Small Satellites
The space environment that satellites face is uncertain and challenging for survival and operation. Traditionally, satellite design methods mitigate the effects of uncertainty through the use of ample margin. However, robust designs often sacrifice significant nominal performance in exchange for …
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Development of Optical Communication Terminals for Increasing Connectivity on Small Satellites
… in CubeSat technology can enable significant new small satellite capabilities. This technology has successfully been implemented and demonstrated for optical downlinks on the CubeSat platform, but work remains toward enabling lower-cost terminals as well as developing and demonstrating optical …
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Power conversion and scaling for vanishingly small satellites with electric propulsion
… effectively miniaturizes propulsion for nanosatellites. Current iEPS thrusters consist of arrays of ion emitters, with a thruster for CubeSat application consisting of hundreds of emitters on a 1 cm² package. As a consequence, the lower bound on the size of satellites incorporating …
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Development of a low-cost multi-camera star tracker for small satellites
The student, Hongrui Zhao, accepted the attached license on 2020-07-20 at 13:59.
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A systems study on how to dispose of fleets of small satellites
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 2001.
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Design and analysis of highspeed electronics for electro optical payload of small satellites
… in the resolution of the Earth observation satellites, the cameras on these satellites require more detectors to fulfil the swath need and also the image sensors have to operate at a very high-speed with the sensor electronics requiring faster clock rates and larger bandwidth. The sensor …
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Development of Structures and Methods for Safe On Orbit Robotic Assembly of Small Satellites
While the advent of small satellites such as CubeSats have allowed for space to become quicker and easier to access, the turn-around time is still insufficient for rapid deployment. Example situations are replacing nodes in large constellations, time-sensitive science experiments, or disaster …
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Characterization of on-orbit robotic assembly
… placing failed nodes within a constellation of satellites and monitoring damaged assets in Low Earth Orbit. Despite the recent proliferation of small satellites, there is a lack of planned demonstrations of spacecraft manufactured through the on-orbit assembly as well as the servicing of small …
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Small Spacecraft Design & Machine Learning-based Approaches To Lunar Robotics Navigation
… This can be facilitated by two key technologies: small satellites and machine learning (ML). Nowadays, satellite technologies have progressed to the point where off-the-shelf components can be purchased for small-satellite missions, greatly reducing the time and cost needed to prepare a new …
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Low cost and portable software defined radio ground station
Small satellites are being launched by a multitude of private and public organizations around the world. They are innately cheaper than their large counterparts. This attribute, and additional ones, such as their easy-to-assemble nature and the convenience of using commercially available …
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Onboard distributed replanning for crosslinked small satellite constellations
… planning and scheduling approach for crosslinked small satellites Earth observation missions. The example cases used involve 65 small satellites in ISS and Sun Synchronous Orbits, as well as NASA's Near Earth Network groundstations, and three target cases. Target cases include urgent observations. …
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