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 888 for “"satellites"”.
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Equalizers for communications satellites
This thesis investigates equalization for advanced protected satellite communications systems in development at MIT Lincoln Laboratory. Equalizers facilitate high data rate communication by correcting dispersion in the transmitter and receiver signal chains. An automated calibration procedure for …
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Maritime surveillance with small satellites
… camera involving in maritime surveillance. Those satellites are the first small satellite launched in 2015 and 2016, respectively, that carry AIS and optical camera onboard besides other payloads in equatorial and polar orbit. This work examined AIS performances from those satellites and creating …
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Phase projection using three satellites
… we establish that the advantage of using three satellites over using just two in noise reduction means that using three satellites should be the way to go in all future work. In addition, this thesis does some in-depth investigation into the effectiveness of the following phase unwrapping …
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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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Dynamics of spinning flexible satellites
This investigation is concerned with the dynamic characteristics and stability of a spinning rigid body with a number of flexible parts. The system is hybrid in the sense that it is described by coordinates depending on time alone and coordinates depending on spatial position and time. The …
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Next generation optical communications for satellites
… communications has been demonstrated on large satellites but their current use upon small satellites (≤ 10 kg) is limited. Within this thesis we address this problem by providing a trade-off analysis for a laser transmitter within space and assess the unique environment in which these laser …
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Resonance studies of artificial earth satellites
… study of the perturbations experienced by these satellites enables knowledge to be gained of the upper atmosphere, the gravity field, ocean tides, solid-Earth tides and solar radiation. The gravity field is expressed as a double infinite series of associated Legendre functions (tesseral …
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Geodetic positioning systems using repeater satellites
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1992.
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Thermal history models of icy satellites.
Thesis. 1975. M.S.--Massachusetts Institute of Technology. Dept. of Earth and Planetary Sciences.
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Tidal evolution of the Uranian satellites
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric and Planetary Sciences, 1988.
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Rotational locks for gravity gradient satellites
Locked-in planar rotational motion for satellites moving in a gravity gradient field is examined using both analytical and numerical techniques. It is shown that rotational locks at spin rates of n/2 (where n is an integer) satellite rotations per orbit revolution exist for specific combinations of …
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Magnetic Stabilization of Nadir-Pointing Small Satellites
… 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 feedback and …
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Autonomous Controls Algorithmfor Formation Flying Of Satellites
… of KnightSat is to show how a constellation of satellites can maintain relative position with each other autonomously using the Microwave Electro Thermal (MET) thruster. The secondary mission is to use multiple satellite imagery to obtain 3 dimensional stereo photographs of observable terrain. …
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Bordered Heegaard Floer Homology, Satellites, and Decategorification
… the classical Alexander polynomial formula for satellites.
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Search for Ultra-faint Milky Way Satellites
… Horologium II is one of the ultra-faint dwarf satellites in the vicinity of the Magellanic Clouds discovered in the Dark Energy Survey Year 1 data. Its proximity to a satellite dwarf Horologium I implies their possible companionship. Kim 1 is an extremely low-mass star cluster in the …
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Search for Ultra-faint Milky Way Satellites
… Horologium II is one of the ultra-faint dwarf satellites in the vicinity of the Magellanic Clouds discovered in the Dark Energy Survey Year 1 data. Its proximity to a satellite dwarf Horologium I implies their possible companionship. Kim 1 is an extremely low-mass star cluster in the …
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Attitude Determination and Control of Nano-Satellites
… is unique in that it is among only a few nano-satellites that implements three-axis, onboard attitude determination and control. Though this is an ambitious goal, it will allow for a wide range of scientific missions to be accomplished on this bus. To complete the system, an accurate attitude …
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