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 41 for “"Guidance and control"”.
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Guidance and control of sounding rockets
… dissertation presents the design, fabrication and testing of a sounding rocket flight computer for the South African Astronomical Observatory (SAAO). Sounding rockets carry instruments with which to take measurements in the Earth’s atmosphere in sub-orbital flight. The South African …
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Guidance and control of swarms of spacecraft
… to spacecraft swarms made up of hundreds to thousands of 100-gram-class spacecraft known as femtosatellites. The large number of spacecraft and limited capabilities of each individual spacecraft present a significant challenge in guidance, navigation, and control. This dissertation deals with the …
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Integrated entry guidance and control for autonomous reusable launch vehicles
The guidance and control approach employed on current reusable launch vehicles is based on classical control techniques developed for the Space Shuttle more than 20 years ago. This approach partitions the guidance and control tasks into separate loops resulting in a complex control architecture …
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Low-thrust Spacecraft guidance and control using proximal policy optimization
… spaceflight with greater robotic autonomy and innovative decision making. However, it remains to be determined which applications are best addressed using this new technology. In the coming decades, future spacecraft will be required to possess autonomous guidance and control in the …
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Guidance and Control System for VTOL UAVs operating in Contested Environments
… presents the initial components of an integrated guidance, navigation, and control system for vertical take-off and landing (VTOL) autonomous unmanned aerial vehicles (UAVs) such that they may map complex environments that may be hostile. The first part of this thesis presents an autonomous …
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Guidance and Control of Autonomous Unmanned Aerial Systems for Maritime Operations
In this dissertation, guidance and control of autonomous unmanned aerial systems (UAS) are explored. Specifically, we investigate model reference adaptive control (MRAC) based systems for tailsitter UAS, and guidance and control of multi-rotor UAS for tactical maneuvering and coverage. …
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Optical illusions and augmented graphics for manned and robotic guidance and control
Piloting and many related control activities, especially remote manipulation via teleoperations and robotics, stand to benefit substantially from better means of communication between controller and controlled. We have investigated one such approach: the use of augmented displays on a cathode ray …
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Vision-based guidance and control of a hovering vehicle in unknown environments
… architecture, hardware implementation, and results of a system capable of controlling and guiding a hovering vehicle in unknown environments, emphasizing cluttered indoor spaces. Six-axis inertial data and a low-resolution onboard camera yield sufficient information for image processing, …
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Towards Autonomy: Leveraging Nonlinearity In Predictive And Convex Optimization For Space Vehicle Guidance And Control
… new age of spaceflight approaches, space vehicle guidance and control methodologies increasingly rely on optimization-based methods, which should be capable of handling complex dynamics, real-world constraints, and limited computational resources. While model predictive control (MPC) and …
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Guidance and control using model predictive control for low altitude real-time terrain following flight
This thesis presents the design and implementation of a model predictive control based trajectory optimization method for Nap-of-the-Earth (NOE) flight. A NOE trajectory reference is generated over a subspace of the terrain. It is then inserted into the cost function and the resulting trajectory …
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Guidance and control for multi-stage rendezvous and docking operations in the presence of uncertainty
Rendezvous and docking missions have been a mainstay of space exploration from the Apollo program through present day operations with the International Space Station. There remains a growing interest in several mission types that not only rely on rendezvous and docking, but also rely on maneuvering …
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Design of a robust integrated guidance and control algorithm for the landing of an autonomous reusable launch vehicle
… Institute of Technology, Dept. of Aeronautics and Astronautics, 1998.
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Optimal guidance and control of heterogeneous swarms for in-orbit self-assembly of large space structures: Algorithms and experiments
This Dissertation was approved for publication on 2019-07-12 at 14:10.
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Model predictive control for terminal area energy management and approach and landing for a reusable launch vehicle
… The new vehicles will need advanced, new guidance and control systems. Since 1996 Draper Laboratory has been developing the next generation guidance and control for reusable launch vehicles in which guidance and control is integrated into one correlated system. Draper's research of …
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Sensor-based automated path guidance of a robot tool
… measurement of the orientation (surface normal) and position of a 3-dimensional unknown object for a precise tool path guidance and control. The proposed system can guide the robot manipulator while maintaining specific orientation between the robot end-effector and the workpiece and also …
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Robust Observers And Controllers For Marine Surface Vessels Undergoing Maneuvering And Course-Keeping Tasks
… by environmental disturbances induced by winds, random sea waves and currents. To yield a desired response of the ship, the guidance and control system of the ship should be robust to both modeling imprecision and significant environmental disturbances.</p> <p>The focus of the current work is …
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Applied fast maneuvering using a hybrid controller
Guidance and control of autonomous vehicles is a difficult and often calculation-intensive process. Current control approaches limit the functionality of autonomous vehicles. The approach applied in this thesis is to use a discrete-state model of the vehicle dynamics to build a hybrid automaton. By …
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Minimization of Roll Firings for Optimal Propellant Maneuvers
Attitude control of the International Space Station (ISS) is critical for operations, impacting power, communications, and thermal systems. The station uses gyroscopes and thrusters for attitude control, and reorientations are normally assisted by thrusters on docked vehicles. When the docked …
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A neural inspired grid cell aid for robot intertial navigation.
… position information is needed for a robot's guidance and control systems. Therefore, the navigation system is foundational for a robot's interactions with the world. This thesis explores a biologically inspired method of navigation with the goal of improving navigational accuracy. The desire …
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