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.
Results
Showing 1 to 11 of 11 for “"Spacecraft formations"”.
-
Control System Design and Simulation of Spacecraft Formations
… an effective control scheme for a formation of spacecraft, implement that control, and provide a 3-D simulation. The thesis first summarizes the progress made in formation flight control schemes and then provides a theoretical framework for the control system design. Using established control …
-
Closed-loop control of spacecraft formations with applications on SPHERES
… capabilities than attainable with a monolithic spacecraft. Successful control of a formation of spacecraft can be divided into two separate stages. The first stage creates a plan that meets a set of mission objectives, and the second stage implements the plan. Plans are specified as a sequence …
-
Control System Design and Simulation of Spacecraft Formations via Virtual Formation Approach
<p>The problem of formation control of multiple spacecraft using the virtual structure approach is studied. The thesis first summarizes the progress made in the area of spacecraft formation control and then provides an overview of the virtual structure method. Modifying earlier established control …
-
Optimization of Spacecraft Formations about Lagrange Points for the Next Generation Space Weather Prediction Mission
… Space Weather Prediction Mission, a multi-spacecraft mission at various libration points whose objective is to forecast Space Weather hazards with a 12day warning time. This thesis deals with the design and control of orbits of spacecraft formations at different libration points. The …
-
Decentralized Coordinated Attitude Control of a Formation of Spacecraft
Spacecraft formations offer more powerful and robust space system architectures than single spacecraft systems. Investigations into the dynamics and control of spacecraft formations are vital for the development and design of future successful space missions. The problem of controlling the attitude …
-
Adaptive Extended Kalman Filtering Strategies for Autonomous Relative Navigation of Formation Flying Spacecraft
… extended Kalman filter navigation algorithms for spacecraft formation flying. The proposed adaptive filters are capable of updating the internal noise characteristics of the Kalman filter in real time, and are viable in all orbit scenarios, including highly elliptical orbits in the presence of …
-
New Estimation Algorithms With Applications To Relative And Absolute Orbit Determination
… for the relative navigation of high-altitude spacecraft and for systems that have implicitly defined measurement times. The first two papers focus on the use of carrierphase differential GPS techniques with integer ambiguities to estimate the relative states of spacecraft formations operating …
-
Trajectory design and control for formation flying spaceborne interferometers
… during observation and retargeting of the spacecraft formations, to thereby maximize the number of observations that can be taken with a given amount of consumables, and (2) determine computationally efficient control techniques to minimize control effort while meeting image synthesis …
-
Model predictive control for formation flying spacecraft
… in finding drift-free initial conditions for spacecraft formations and for designing feedback controllers. This thesis presents extensions to the equations of relative motion expressed in both Cartesian reference frames and Keplerian orbital elements, including new initialization techniques …
-
Analytical and Numerical Analysis of Static Coulomb Formations
… In the latter application, the individual spacecraft assume fixed positions relative to each other through the use of Coulomb forces. In the work presented here, an analytical and numerical analysis is performed on such virtual structures. In the analytical portion, the constant, open-loop …
-
Development of a Mission Design Tool for Computing Libration Point Formations Using Differential Corrections Initialized with a Genetic Algorithm
<p>"The growing interest in deep space spacecraft missions and distributed spacecraft formations has established the need for state-of-the-art advancements in the areas of relative dynamics and mission design. The focus of this research is to develop methods for identifying natural (i.e. ballistic) …