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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 33 for “"Attitude Determination and Control"”.
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Attitude Determination and Control of Nano-Satellites
… that implements three-axis, onboard attitude determination and control. Though this is an ambitious goal, it will allow for a wide range of scientific missions to be accomplished on this bus. To complete the system, an accurate attitude determination system needs to be developed. …
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An attitude determination and control system for small satellites
A flexible, robust attitude determination and control (ADC) system is presented for small satellite platforms. Using commercial-off-the-shelf sensors, reaction wheels, and magnetorquers which fit within the 3U CubeSat form factor, the system delivers arc-minute pointing precision. The ADC system …
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Improved qualification and algorithms for illinisat-2 attitude determination and control
… the IlliniSat-2 CubeSat bus, a generic scalable and modular design, utilizing commercially available off the shelf (COTS) parts. The Attitude Determination and Control System (ADCS) of the bus is purely magnetic, relying on magnetometers for determination and magnetorquers for actuation. The pure …
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A novel magnetic field approach to simulate spacecraft attitude determination and control
… which will be capable of achieving 3-axis attitude control via magnetic torque coils and attitude determination via Kalman-filtered magnetometer data with an optional Sun vector measurement. This innovative new attitude determination and control (ADC) method is more sophisticated than those …
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Development and analysis of a small satellite attitude determination and control system testbed
Attitude Determination and Control Systems (ADCS) are critical to the operation of satellites that require attitude knowledge and/or attitude control to achieve mission success. Furthermore, ADCS systems only operate as designed in the reduced friction, micro-gravity environment of space. …
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Improving attitude determination and control of resource-constrained CubeSats using unscented Kalman filtering
CubeSats are a specific subset of nanosatellites, and their common form factor and canisterized deployers have made it possible to undertake higher risk, lower cost missions that can supplement the current generation of large, monolithic, expensive satellites. Our objective in this thesis is to …
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Hardware-in-the-Loop Simulation for Verification of CubeSat Attitude Determination and Control Subsystem
… this desired orientation, CubeSats must use an attitude determination and control subsystem, commonly known as an ADCS. Tasked with creating and maintaining an appropriate orientation for the satellite, the ADCS is a complex system, and often there are difficulties verifying the functionality of …
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Testing the attitude determination and control of a CubeSat with hardware-in-the-loop
… thesis presents a methodology for testing the attitude determination and control of a CubeSat within a constrained environment. This approach first evaluates the concept of operations of the satellite mission, then takes into account the limitations of the test environment, formulates test …
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Computational Methods to Improve Satellite Attitude Determination and Control with a Focus on Autonomy, Generalizability, and Underactuation
The attitude determination and control system (ADCS) onboard a satellite uses sensors to measure orientation and angular velocity, enabling the satellite to manage angular momentum, counteract disturbances, and point in the desired directions. Many historical ADCS approaches are designed for …
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Advancements in the Design and Development of CubeSat Attitude Determination and Control Testing at the Virginia Tech Space Systems Simulation Laboratory
… involved in the development of CubeSats lies the attitude determination and control of the satellite. The importance of a properly functioning attitude determination and control system (ADCS) on any satellite is vital to the satisfaction of its mission objectives. Due to this importance, …
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Magnetic attitude control of LAICE satellite with aerodynamic stabilization
… be performing in-situ measurements of neutral and ion densities in the mesosphere, lower thermosphere, and ionosphere and correlating them to measurements of gravity waves in the lower atmosphere. The satellite is based on a new 6U CubeSat form factor based on the IlliniSat 2 bus developed at …
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Pointing system performance analysis for optical inter-satellite communication on CubeSats
… (RF) communication systems in size, weight, and power consumption (SWaP). Key benefits are due to the shorter wavelength: additional bandwidth and narrow beam width. The narrower beam supports higher energy density for a given aperture size, so that lasercom can transmit data at the same rate …
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CubeSat attitude control using micronewton electrospray thruster actuation
… are a promising new actuator for CubeSat attitude control. Electrospray thrusters have advantages over current state of the art CubeSat attitude actuators in mass, volume, and their ability to produce translational acceleration in addition to control moments. An attitude determination and …
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From CubeSats to constellations : systems design and performance analysis
… obtain global measurements with improved spatial and temporal resolution. The small size, low cost, standardized form factor, and increasing availability of commercial parts for CubeSats make them ideal for use in constellations. In this work, we provide an in-depth analysis of how to evolve from …
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Satellite Reorientation Using Reinforcement Learning Under Unknown Attitude Failure
… with deep-space satellites under unknown attitude determination and control system (ADCS) failures. When traditional fault-tolerant control methods cannot restore signal, the proposed RL controller acts as a last-resort measure by autonomously reorienting the satellite’s antenna toward …
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Development of a model-based systems engineering architecture for an unmanned cargo spacecraft design
… involve exceedingly complex systems engineering and design in order to implement. UCS typically include a vast range of subsystems – Command and Data Handling (C&DH), Attitude Determination and Control System (ADCS), Propulsion, Guidance, Navigation, and Control (GNC), Communications, etc. – and …
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The Design and Implementation of a Nanosatellite State-of-Health Monitoring Subsystem
… system solution. The proposed system solution, and design and implementation of a multiple-bus master FPGA and health monitoring space computer subsystem are described. In the fall of 1998, the US Air Force (USAF) funded Virginia Polytechnic Institute & State University (Virginia Tech), The …
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Design of a scalable nano university satellite bus (IlliniSat-2 bus) command and data handling system and power system
… based upon. The IlliniSat-2 bus consists of Command and Data Handling system, Power Generation and Distribution system, Attitude Determination and Control system and Radio system. The IlliniSat-2 is required to be capable of operating a nanosatellite from size 1.5U (10x10x17cm) to 6U …
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Laser beacon tracking for free-space optical communication on small-satellite platforms in low-earth orbit
… links, meeting the growing downlink demand of space missions, including those on small-satellite platforms. FSO communication takes advantage of the high-gain nature of narrow laser beams to achieve higher link efficiency than traditional radio-frequency systems. In order for a FSO link …
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