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 947 for “"Pointing"”.
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Pointing and the Acquisition of Language
Made available in DSpace on 2015-05-13T15:18:32Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 7606823.PDF: 11272629 bytes, checksum: 34f1a41b18b1eb515e3cbf34b8159ee1 (MD5) Previous issue date: 1975
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Pointing acquisition and stabilization test bed
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1993.
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Understanding and Improving Distal Pointing Interaction
Distal pointing is the interaction style defined by directly pointing at targets from a distance. It follows a laser pointer metaphor and the position of the cursor is determined by the intersection of a vector extending the pointing device with the display surface. Distal pointing as a basic …
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Magnetic Stabilization of Nadir-Pointing Small Satellites
… laws that achieve three-axis stabilized nadir-pointing attitude. Two types of nonlinear feedback control laws are proposed: full-state feedback and passivity-based feedback. Full-state feedback uses the attitude and angular velocity measurements to regulate the spacecrafts dynamics. …
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International Space Station Remote Sensing Pointing Analysis
… contributing to drift and jitter, accuracy of pointing data and target and instrument accuracies. Finally, there is a brief discussion of image processing to address any post error correction options.
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Formation Flying Performance Measures for Earth Pointing Missions
Clusters of low-performance spacecraft flying in formation may provide enhanced performance over single high-performance spacecraft. This is especially true for remote sensing missions where interferometry or stereographic imaging may provide higher resolution data. The configurations of such …
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Assessing the impacts of fractionation on pointing-intensive spacecraft
… spacecraft are of particular interest for pointing-intensive, remote sensing mission spacecraft because of their ability to physically decouple subsystems and payloads that truly need precise pointing, thereby potentially reducing the lifecycle cost of fractionated spacecraft relative to a …
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Precision Pointing for the CubeSat Laser Infrared CrosslinK (CLICK) Mission
… system (MEMS) fine steering mirror for precision pointing. The first phase of the CLICK mission, CLICK-A, launched in September 2022 to demonstrate optical downlink. The second phase, CLICK-B/C, aims to demonstrate optical crosslink between two spacecraft: CLICK-B and CLICK-C. Optical crosslink …
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Statistical analysis of a high accuracy pointing and tracking system
Thesis. 1975. M.S.--Massachusetts Institute of Technology. Dept. of Aeronautics and Astronautics.
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Pointing system performance analysis for optical inter-satellite communication on CubeSats
… However, lasercom requires much more accurate pointing because of its narrower beam width. Accurate pointing is not trivial for most CubeSat platforms due to their resource constraints. A typical 3U CubeSat is 34 cm x 10 cm x 10 cm with less than 5 kg mass and about 10 W of available …
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Pointing acquisition and tracking design and analysis for CubeSat Laser communication
… weight, and power (SWaP) laser communication pointing, acquisition, and tracking (PAT) design for CubeSats in low earth orbit (LEO). As data production on-orbit continues to grow due to sensor miniaturization and the increased prevalence of satellites in LEO, current RF communication systems …
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Planning accidents and pointing at them : translation and "the truth of solipsism"
All the things that drive me as an artist are about the same question. It is a question that may be asked in different ways. I want to know how I am already a part of the world. I want to know if when I look at the world it is the same thing others see. I want to discover why it is not possible for …
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High-precision pointing and attitude estimation and control algorithms for hardware-constrained spacecraft
… is to develop algorithms for high-precision pointing and attitude estimation and control on hardware-constrained spacecraft. This includes small spacecraft, where tight mass, volume, power, and cost constraints exist, as well as spacecraft where certain hardware has failed. As a case study, …
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Control design and performance evaluation of a hybrid flexure bearing for precision pointing applications
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2023-04-12 without embargo terms
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On-Orbit Pointing Risk Mitigation for the Agile MicroSat (AMS) CubeSat Laser Guidestar Payload
… mirrors, to utilize only open-loop body-pointing and generic CubeSat attitude control software. This thesis presents the pre-launch work, the radiometric link analysis, and a novel on-orbit scanning procedure to reduce mission risk due to a static pointing error and if necessary, recover …
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