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 63 for “"Formation Flying"”.
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Autonomous Controls Algorithmfor Formation Flying Of Satellites
… stereo photographs of observable terrain. Formation flying itself has many possible uses for future applications. Selected missions that require imaging or data collection can be more economically accomplished using smaller multiple satellites. The MET thruster is a very efficient, but low …
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Relative Position Control for Satellite Formation Flying
Satellite formation flying is a field where the relative positions between two or more satellites are tightly controlled. It is a relevant and growing field that enables missions that otherwise might not be achievable using a single monolithic satellite. This thesis focuses on designing and …
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Subpixel multiframe registration for formation flying spacecraft
… between frames. The algorithm is developed with formation flying applications in mind, where such motion is common. The algorithm is non-iterative (obtaining a registration estimate in a fixed amount of time), efficient (requiring only FFT and spatial scaling operations), and parameterless …
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Model predictive control for formation flying spacecraft
Formation flying is an enabling technology for many future space missions. This thesis addresses some of the key dynamics and control issues expected in future missions by pursuing two areas of advancement: extensions of relative linear dynamics models and assessment and mitigation of sensor noise …
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Optimal orbit transfers for satellite formation flying applications
… arising from the application of satellite formation flying, and obtained three major results. First, the dissertation proposed an algorithm for finding a multi-impulse, fuel-optimal trajectory, based on relative motion dynamics, and the necessary conditions from the Pontryagin Maximal …
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Micropropulsion system selection for precision formation flying satellites
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 2001.
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Formation Flying Performance Measures for Earth Pointing Missions
Clusters of low-performance spacecraft flying in formation may provide enhanced performance over single high-performance spacecraft. This is especially true for remote sensing missions where interferometry or stereographic imaging may provide higher resolution data. The configurations of such …
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Distribued estimation architectures and algorithms for formation flying spacecraft
Future formation flying missions are being planned for fleets of spacecraft in MEO, GEO, and beyond where relative navigation using GPS will either be impossible or insufficient. To perform fleet estimation for these scenarios, local ranging devices on each vehicle are being considered to replace …
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Acquisition and control of a precision formation flying mission
Using formation flying spacecraft as space-based interferometers will provide images of unprecedented resolution. Missions such as Stellar Imager plan to use multiple spacecraft in a formation instead of a typical monolithic space telescope, achieving a resolution up to 0.1 milliarcseconds. In …
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Analysis of relative navigation architectures for formation flying spacecrafts
… involve fleets with a large number of satellites flying in formation. Indeed, such fleets provably offer more reliability, redundancy, scalability and repeatability. However, large fleets also represent a challenge, especially for the navigation algorithms, which must provide an accurate estimate …
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Trajectory design and control for formation flying spaceborne interferometers
… 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 metrics. First, …
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Optimum Spanloads Incorporating Wing Structural Considerations And Formation Flying
… performance benefits. For a group of aircraft flying in formation, non-elliptic lift distributions can give high induced drag reductions both for the formation and for each airplane. For single aircraft, a discrete vortex method which performs the calculations in the Trefftz plane has been used …
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Optimal thruster selection with robust estimation for formation flying applications
… system are performed on the SPHERES and Orion formation flying test beds and results show improved control capabilities along with significant fuel saving.
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A real-time simulator for the SPHERES formation flying satellites testbed
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 2002.
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GNSS-based Spacecraft Formation Flying Simulation and Ionospheric Remote Sensing Applications
… absolute and relative navigation for spacecraft formation flying. Ionospheric remote sensing, such as Total Electron Content (TEC) measurements or ionospheric irregularity studies are important potential Low Earth Orbit (LEO) applications. A GNSS-based Hardware-in-the-loop (HIL) simulation …
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Real time hardware in the loop simulation testbed of spacecraft formation flying
… benefits associated with SFF (satellite formation flying) have led to considerable research in this concept around the world. As it is a new field of research and the implementation of formation flying in practice brings some inherent challenges and risks It is therefore particularly …
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Adaptive Extended Kalman Filtering Strategies for Autonomous Relative Navigation of Formation Flying Spacecraft
… 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 perturbations. …
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Distributed estimation and control technologies for formation flying spacecraft by Philip Andrew Ferguson.
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 2003.
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