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 20 for “"descent and landing"”.
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Terrain relative localization for lunar entry, descent, and landing
… continues, the need for the capability to land a spacecraft very accurately on a planetary body has become apparent. Due to limitations on the achievable accuracy of inertial navigation systems over long distances, relative navigation techniques are better suited to fill this need. Chief …
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Robust trajectory and guidance optimization for guided powered descent and landing
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2025-05-01
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Entry, descent and landing vehicle design space exploration for crewed Mars missions
… of at least an order of magnitude in the landed mass performance of entry, descent and landing (EDL) vehicles compared to previous successful robotic missions and ones currently planned for the near future. The work presented in this thesis attempts to look at the effect of individual …
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A systems and cost analysis of human rated Mars entry, descent, and landing vehicles
… until after the preliminary vehicle and mission concepts have been designed. Once costs have been estimated, managers and project teams often lack confidence that the final cost of the mission will match the preliminary estimates. The present work provides a robust methodology for …
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Hypersonic flight strategies for supersonic retropropulsion at Mars
… Mars surface exploration missions require landed masses beyond the capability of current entry, descent, and landing technology. High-mass missions will likely use supersonic retropropulsion to increase landed mass, a paradigm shift from current supersonic parachute systems. This work …
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Autonomous Landing of an Unmanned Aerial Vehicle on an Unmanned Surface Vessel using Model Predictive Control with an Adaptive-Covariance Extended Kalman Filter
… the development of vision-based estimation and model predictive control (MPC) strategies to enable an Unmanned Aerial Vehicle (UAV) to land autonomously on an Unmanned Surface Vessel (USV) subjected to wave-induced motion. An innovative Adaptive-Covariance Extended Kalman Filter (AEKF) …
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Assessment of aerocapture-entry trajectories for human Mars exploration
… into an elliptic parking orbit prior to entry, 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 …
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Magnetohydrodynamic energy generation and flow control for planetary entry vehicles
… missions such as a Mars sample return mission and a human mission to Mars require landed payload masses in excess of any previous Mars mission. Whether human or robotic, these missions present numerous engineering challenges due to their increased mass and complexity. To overcome these …
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Development, Verification, and Future Applications of a 3-DoF Entry and Descent Simulation Tool
… effects must be accounted for in some fashion, and often lead to mission elements being centered around gathering information on the unknown.</p> <p>It is the purpose of this research to develop and test a tool for simulation of entry, descent, and landing, (EDL) and to present a brief analysis …
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Aerodynamic modeling and assessment of flaps for hypersonic trajectory control of blunt bodies
… introducing additional benefits during entry, descent, and landing. Flaps provide direct control of the vehicle’s lift and drag vectors, eliminating the need for a center of gravity offset and enabling a relatively constant vehicle attitude. A near-constant attitude may allow the use of …
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Ab Initio Computation of Radiative Properties of Monatomic Hydrogen
… renewed interest in planetary atmospheric entry, descent, and landing, NASA has noted a need for improved physics modeling in computational fluid dynamics. Uncertainty in experimental data used in radiation heat transfer computations leads to “over-engineering” of entry body heat shields, at large …
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Temporal and Geographical Variation in Martian Surface Dust Lifting Processes
… of key aspects of the Martian dust cycle and investigating their importance in predicting conditions for spacecraft atmospheric descent and landing. The dust cycle – lifting, transportation and deposition – is a significant Martian climate cycle. The geographical and temporal variation in …
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Optimal lift and drag modulation hypersonic control options for high ballistic coefficient entry vehicles at Mars
Future Mars entry, descent, and landing (EDL) missions will require larger mass vehicles and payloads, especially if humans are to land on the surface. Current Mars EDL technology relies heavily on Viking-era supersonic parachutes that are approaching their landed mass limits; however, supersonic …
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Data-Driven and Dynamically Feasible Trajectory Generation for Real-Time Powered Descent Guidance and Robotic Exploration
Increasingly complex and high-mass planetary missions require autonomous long-horizon trajectory generation to achieve dynamically feasible powered descent guidance. While analytical and indirect methods are computationally efficient, significant simplifications of the dynamics and constraints are …
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Morphing Hypersonic Inflatable Aerodynamic Decelerator (HIAD) Mechanisms and Controls
To enable a crewed mission to Mars, precision landing capabilities of Entry, Descent, and Landing (EDL) systems must be improved. The need for larger payloads, higher landing sites, and controllability has motivated the National Aeronautics and Space Administration (NASA) to invest in new …
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Small Spacecraft Design & Machine Learning-based Approaches To Lunar Robotics Navigation
… missions, including flybys, orbiters, landers (crewed and robotic), rovers, and impactors. The next generation of lunar exploration will include a cis-lunar station, crewed missions, and in-situ resource utilization (ISRU)-based missions that will generate significant amounts of data to …
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Assessment of application of the steep-lifting entry trajectory solution to real-time entry guidance
… expressions for range, flight-path angle, and altitude as functions of velocity. This thesis assesses the applicability and performance of the steep-lifting entry trajectory solution in the context of a root-solving guidance algorithm for direct entry applications with bank angle …
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Performance assessment of Mars entry systems with flap-based trajectory control
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2022-11-14 without embargo terms
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Assessment of aerosurface-based hypersonic control of blunt bodies for planetary entry
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2025-10-19 without embargo terms