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 10 of 10 for “"Deep Space Network"”.
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Dynamic Code Selection Method for Content Transfer in Deep Space Network
Space communications feature large round-trip time delays (for example, between 6.5 and 44 minutes for Mars to Earth and return, depending on the actual distance between the two planets) and highly variable data error rates, for example, bit error rate (BER) of 10−5 is very comand even higher BERs …
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Scenario-based uncertainty quantification for deep space optical communications
This thesis develops a framework for evaluating deep space communication architectures under uncertainty and explores the potential of optical communications to meet the future data requirements of deep space science missions. Currently, the Deep Space Network (DSN) relies solely on radiofrequency …
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System level dispersion analysis examining program benefits to a low-thrust interplanetary CubeSat from autonomous guidance and navigation
Ground based measurements through the Deep Space Network (DSN) are unlikely to be available as often for CubeSats as for prior deep space programs because higher priority missions will take precedence for access to the limited and expensive DSN resource. Consequently, to make the most of CubeSats …
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Linear covariance analysis trade study of autonomous navigation schemes for cislunar missions
Deep space missions to the Moon and Mars under NASA's Constellation Program are a tangible goal. However, the Deep Space Network (DSN) antennas which provided ground based navigation state updates to spacecraft of the Apollo era are aging and overtaxed. The over-reliance on this ground based system …
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Conceptual design of HADES a CubeSat conducting radio astronomy in lunar orbit
… parameter sweep of the lunar orbital phase space. This analysis identified a narrow corridor of “quasi-frozen” near-equatorial orbits (a ≈ 1833 km, e ≈ 0.01, i ≈ 0.30◦, ω ≈ 160◦) capable of maintaining stability for over one year without the need for station-keeping maneuvers. The selected …
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Multiple Simultaneous Optical Links for Space-Based Platforms
Space-based Free Space Optical Communications (FSOC), or lasercom, offers key advantages over Radio Frequency (RF) communications in bandwidth, Size, Weight, and Power savings, and unregulated spectrum. Theoretical and demonstrated lasercom systems have shown higher data rates for similar or equal …
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Market-Based Systems for Solving Space Exploration Resource Allocation Problems
The very nature of space exploration implies "doing that which has never been done before." As such, the resources needed to meet the objectives of such a grand endeavor, if available, are extremely scarce. Every mission since the birth of the space programme has been resource limited. To overcome …
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Optimization and Characterization of Chance-Constrained Guidance, Navigation, and Control for Low-Energy Lunar Transfers
… dynamics show great promise for future space exploration; in regions with multiple dominant gravitating bodies (for example, in the Earth-Moon system or among the gas giant moons) they can offer reduced capture Δv, more flexible launch windows, and an increased set of accessible arrival …
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Deep-Space Exploration Enabled by CubeSats with Staged Electrospray Propulsion
… and a capable tool for scientific missions. Deep-space CubeSats have been limited to rideshare launches thus far, acting as companions to enhance large missions or using propulsion to reach science orbits near the destination of the primary mission (e.g. to Mars or around the Moon). More …
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Stochastic Optimization Powered by Markov Chain Monte Carlo: Mixed-Integer Nonlinear Programming for Communications Network Scheduling
… mathematical problems, including those in mixed spaces of continuous and discrete components. In this dissertation, we examine variations of complicated scheduling problems involving allocating spacecraft communication time on a fixed number of antenna resources located at several physical …