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 43 for “"Orbiter"”.
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Uranus orbiter and probe mission : Project Upsilon
… is a proposed NASA Flagship Class, Uranus Orbiter and Probe mission concept to investigate Uranus' planetary magnetic field and atmosphere. Three spacecraft - the Upsilon-0 Propulsion Module, the Upsilon-1 Science Orbiter, and the Upsilon-2 Atmosphere Probe - shall be implemented to meet …
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Lunar orbiter state estimation using neural network-based crater detection
Terrain relative navigation can improve the precision of a spacecraft's state estimate by providing supplementary measurements to correct for drift in the inertial navigation system. This thesis presents a crater detector, LunaNet, that uses a convolutional neural network and image processing …
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Three-dimensional nonequilibrium viscous shock-layer flow over the space shuttle orbiter
… nonequilibrium flowfield past the space shuttle orbiter at high angles-of-attack (up to 50-deg). An existing viscous shock-layer method for perfect gas flows has been extended to include finite-rate chemical reactions of multi-component ionizing air. A general nonorthogonal computational grid …
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Investigation of regional variation in Lunar crater morphometry from (Lunar Orbiter Laser Altimeter) LOLA observations
… of the lunar surface, obtained from the Lunar Orbiter Laser Altimeter (LOLA), has allowed for a quantitative assessment of crater morphometry. 351 simple and complex craters in the Mare Serenitatis, far side highlands, near side highlands, and South Pole-Aitken basin are decomposed into 50 …
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Calibrazione radiometrica in volo del coronografo Metis a bordo di Solar Orbiter. Primi risultati dalle immagini calibrate.
Solar Orbiter è una missione spaziale con due importanti caratteristiche uniche: si avvicina al Sole con un'orbita ellittica, fino a un perielio di 0,28 UA, mai raggiunto prima dalle missioni solari che trasportano strumentazione di remote-sensing, e osserverà il Sole e la sua atmosfera in uscita …
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Judging a planet by its cover : insights into lunar crustal structure and Martian climate history from surface features
… data with elevation measurements from the Lunar Orbiter Laser Altimeter (LOLA) aboard the Lunar Reconnaissance Orbiter (LRO) to investigate the nature of isostatic compensation in the lunar highlands. In chapter 4, I present a new technique for analysis of the Martian polar layered deposits …
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Diagnostica dell'espansione della corona solare attraverso osservazioni del coronografo Metis
… Metis, a bordo della sonda spaziale Solar Orbiter. Metis è capace di effettuare osservazioni della corona solare fino a una distanza minima di di 0.28 au, fornendo immagini dettagliate importanti per una investigazione profonda delle sorgenti del vento solare, evidenziando la loro …
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National Ocean Service stellar calibration procedure for the large format camera
… carried into orbit as a payload in the Shuttle Orbiter vehicle's cargo bay. A mapping camera must be calibrated to determine precise values for its elements of interior orientation. The Large Format Camera was calibrated by the stellar method of camera calibration. Descriptions of the procedure …
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Safe Harbor: An Exploration in Lunar Habitation
… data and imagery from the Lunar Reconnaissance Orbiter allows the project to narrow focus on site selection while simultaneously capturing the bizarre and beautiful landscape. Intensive site study becomes the framework of a uniquely tailored, imaginative design emphasizing an urban fabric that …
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A Low-Lunar Orbit CubeSat Solution to Mission-Oriented Lunar Surface Imagery Requirements
… projects such as the Lunar Reconnaissance Orbiter (LRO) or its planned follow on, the Lunar Exploration and Science Orbiter (LExSO). Aside from the expense involved in developing, deploying, and operating such assets, they are inherently limited as singular platforms. This work proposes a …
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Investigation of the depth and diameter of simple craters in the lunar mare
Using altimetry data from the Lunar Orbiter Laser Altimeter (LOLA), the depths and diameters of 1429 simple craters in six different lunar maria units were measured, The analysis utilized a Graphical User Interface that was developed to access the LOLA data base and measure crater depth and …
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Interplanetary Ridesharing: Exploring Potential CubeSat Trajectories
… CubeSat deployer. These categories are flyby, orbiter, and lander. For each category the objective function starts with four design variables. These are the ΔV of the deployer broken up into three component directions and the true anomaly at the time of deployment. The method then calculates …
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An integrated traverse planner and analysis tool for future lunar surface exploration
… generated from topography data from the Lunar Orbiter Laser Altimeter instrument aboard the Lunar Reconnaissance Orbiter. The efficiency of a traverse is derived from any number of metrics: the path distance, time, or the explorer's energy consumption. Energy consumption is either the metabolic …
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Gravity-assist trajectories to Venus, Mars, and the ice giants: Mission design with human and robotic applications
… cases for each launch year are cataloged for orbiter missions to Uranus and Neptune. Solutions with sufficient delivered payload for a multi-planet mission (e.g. sending a probe to Saturn on the way to delivering an orbiter at Uranus) become available when the Space Launch System (SLS) launch …
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Constraining the average fill densities of Mars' lowlands and fluvial erosion of Titan's polar regions.
… proportions. In Chapter 1, we use the Mars Orbiter Laser Altimeter (MOLA) topography data, the Mars Reconnaissance Orbiter (MRO) gravity model and a Wiener filter to map these buried craters and estimate minimum fill thickness and volume as well as maximum fill density. The overall trend …
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Surface roughness of Mars
… for the saturation of data collected by the Mars Orbiter Laser Altimeter (MOLA). Saturation of the energy measurements had made it impossible to measure surface roughness at 100 m length scales. By calculating the returned energy, the problem of saturation can be avoided. This algorithm was …
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Implications of Martian polar insolation levels on the climatic cycling of volatiles
… model (GEM) of the elevation data from the Mars Orbiter Laser Altimeter, to provide accurate insolation calculations. This method takes into account the long and shortwavelength topography, the planetary curvature, and the planetary flattening. This paper outlines the design and implementation of …
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Analysis of automatic guided vehicles and self-guided vehicles for hospital foodservice
… from the bids of Apogee Robotics for their Orbiter{dollar}\sp{\rm TM}{dollar} system (AGV) and Transitions Research Corp for the HelpMate{dollar}\sp{\rm TM}{dollar} self guided robot, to Humana Hospital Sunrise. The major difference between the two systems is that the AGV can carry a full …
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Removal of carbon dioxide and water using a solid amine adsorption bed for extended space flight
… is being used for the shuttle extended duration orbiter (EDO) missions. A computer model was developed to predict the adsorption of carbon dioxide and water onto a polyethyleneimine coated acrylic ester substrate (designated HSC+). Nineteen experimental adsorption breakthrough tests were …
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