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 30 for “"Mars exploration"”.
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Strategies for affordable human Moon and Mars exploration
The U.S. Vision for Space Exploration calls for NASA to undertake human exploration of the Moon and Mars. This endeavor must be performed in an affordable manner in order to be successful. This thesis outlines a series of affordability strategies that could be considered as part of the Vision for …
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Assessment of aerocapture-entry trajectories for human Mars exploration
… descent, and landing is being explored for human Mars missions. These aerocapture-entry trajectories have advantages over a direct entry, but the advantages come at the cost of additional entry system mass. The goal of this research is to identify the parking orbit which minimizes entry system …
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Integrated navigation architecture analysis for Moon and Mars exploration
The new solar system exploration objectives announced in January 2004 have the goal of sending humans back to the Moon by the year 2020 in preparation for human exploration of Mars. Advanced, but cost effective, surface navigation and communication capabilities are required to support these new …
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Comparative analysis of surface power system architectures for human Mars exploration
… and energy storage architectures for human Mars surface missions, including tracking and non-tracking photovoltaic power generation, nuclear fission power, dynamic radioisotope power generation, and battery and regenerative fuel cell energy storage. The quantitative analysis is carried out …
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Propulsive and logistical feasibility of alternative future human-robotic Mars exploration architectures
… the final steps on the way to a human landing on Mars. Comparison of selected figures of merit, such as the mass required in Low- Earth Orbit, number of sites explored, and crew-exploration days, gives mission designers a means to begin down-selecting mission concepts at this early phase and focus …
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Investigating the Role of Mission Architecture in Crew Socioemotional Health for Mars Exploration
Human space exploration is evolving rapidly, with commercial successes and NASA’s Artemis missions driving rapid growth and innovation. Plans for longer, larger, and more complex missions necessitate development of new mission architectures to sustain the crews needed to support these missions. …
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Effect of halite and calcite coatings on thermal infrared spectra wih implications for Mars exploration
… geochemical conditions of surface solutions on Mars. Salts deposited as coatings are particularly important for attaining this knowledge because the thermal infrared (TIR) remote sensing method for determining mineral abundance is limited to the top few hundred micrometers of the surface. To …
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Development of a Mars Exploration Rover for RASC-AL Exploration RoboOps Competition with an Extended Kalman Filter Based Navigation System
… Systems Concepts Academic Linkage (RASC-AL) Exploration RoboOps challenge. This competition takes place at NASA's Johnson Space Center Rock Yard, a test facility with many obstacles including steep hills, craters, rocks and loose sandy terrain. In addition to the challenges of the terrain, …
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Design of spacecraft for exploration of the Moon and Mars
… spacecraft required for human-Lunar and human-Mars exploration. The requirements for these vehicles are derived in the context of the NASA Concept Exploration & Refinement project. Similarly, the concepts generated are intended to operate within the transportation architecture developed during …
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Finite-rate control : stability and performance
… or in constrained environments (eg. deep sea/Mars exploration). These complexities demand that control be integrated with the protocols of communication to ensure stability and performance. Control over networks is recent and continues to receive growing interest. Initial work has focused on …
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Vision-based terrain classification and classifier fusion for planetary exploration rovers
… rover operation plays a key role in planetary exploration missions. Rover systems require more and more autonomous capabilities to improve efficiency and robustness. Rover mobility is one of the critical components that can directly affect mission success. Knowledge of the physical properties …
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Strategies for launch and assembly of modular spacecraft
NASA's human lunar and Mars exploration program requires a new transportation system between Earth and the Moon or Mars. In recent years, unfortunately, human space exploration programs have faced myriad political, technical, and financial difficulties. In order to avoid such problems, future human …
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Methods and tools for the formulation, evaluation and optimization of rover mission concepts
Traditionally, Mars rover missions have been conceived with a single point design approach, exploring a limited architectural trade space. The design of future missions must resolve a conflict between increasingly ambitious scientific objectives and strict technical and programmatic constraints. …
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Development, Verification, and Future Applications of a 3-DoF Entry and Descent Simulation Tool
… radiosonde deployment on the surface of Mars.</p> <p>The EDL simulation tool is written in Matlab. The aerodynamic information used by the tool is obtained with the use of HEAT/TK. HEAT/TK is an aerodynamic coefficient solver written by The Boeing Company, and distributed by the US Air …
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Enhancing the science return of Mars missions via sample preparation, robotic surface exploration and in orbit fuel production
The future of Mars exploration is challenging from multiple points of view. To enhance their science return, future surface probes will most likely be equipped with complex Sample Preparation And Transfer (SPAT) facilities. Future rovers will need to be able to perform longer traverses and delicate …
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Design methods for cost-effective teams of mobile robots in uncertain terrain
Conducting planetary exploration missions with mobile robots is expensive, with costs ranging from hundreds of millions to billions of dollars. Developing reliable robots to work remotely on rough, uncertain terrain is imperative for these missions. One potential tactic for improving the …
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Fluids in Planetary Systems
… modeling of aqueous alteration processes on Mars. Results of impact experiments and analyses of fluid inclusions in rocks from the Ries Crater and Meteor Crater indicate that fluid inclusions reequilibrate systematically with increasing shock pressure: stretching and decrepitating under low …
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Radiative transfer modeling of thermal infrared emissivity spectra: applications to martian regolith observations
… effects that are clearly present in the Mars Global Surveyor Thermal Emission Spectrometer (MGS-TES) and Mars Exploration Rover mini-TES datasets. The research goals of this dissertation directly involve the extraction of information on two major dust microphysical properties: particle …
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Annals Of A Former World: The Remnants Of Water At Gusev Crater And Eberswalde Crater, Mars
… distribution, form, and behavior of water on Mars is critical to assessing whether the planet is, or was ever, a habitable world. This thesis examines the evidence for a more water-rich past that is preserved at two key locations on Mars: (1) Gusev crater, the landing site of the Mars …
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Escape of hydrogen from the exosphere of Mars
After decades of exploration, the martian neutral hydrogen exosphere has remained poorly characterized. The first measurements of this layer by Mariner 6 and 7 revealed it to be optically thick in Lyman α emission, along with a characteristic temperature that was higher than the majority of the …
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