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  • 1
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    A survey of spacecraft formation flying guidance (2002)
    In:  Other Sources
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    Publication Date: 2018-06-08
    Description: This paper is the first comprehensive spacecraft formation flying guidance (FFG) survey. Here by the term guidance we mean both path planning (i. e., reference trajectory generation) and optimal, open loop control design. FFG naturally divides into two areas: Deep Space (DS), in which relative spacecraft dynamics reduce to double integrator form, and Planetary Orbital Environments (POE), in which they do not (e.9. libration point formations). Both areas consider optimal formation reconfigurations. In addition, DS FFG addresses optimal u, v-coverages for multiple spacecraft interferometers and rest-to-rest rotations. The main focus of the POE literature, however, is 'assive apertures.' These are periodic and fuel-eficient relative spacecraft trajectories that accomplish scientific objectives (e.9. synthesizing an aperture).
    Type: International Symposium on Formation Flying Missions and Technologies; Toulouse; France
    Format: text
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  • 2
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    Initialization of distributed spacecraft for precision formation flying (2003)
    In:  Other Sources
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    Publication Date: 2018-06-08
    Description: In this paper we present a solution to the formation initialization problem for N distributed spacecraft located in deep space. Our solution to the FI problem is based on a three-stage sky search procedure that reduces the FI problem for N spacecraft to the simpler problem of initializing a set of sub-formations. We demonstrate our FI algorithm in simulation using NASA's five spacecraft Terrestrial Planet Finder mission as an example.
    Type: IEEE Control Conference and Application; Istanbul; Turkey
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  • 3
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    On the validity of the double integrator approximation in deep space formation flying (2002)
    In:  Other Sources
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    Publication Date: 2018-06-11
    Description: Free-flying models are commonly used f o r path planning and open loop control design (i. e., guidance design) and translational feedback control design (i. e., control design) for deep space precision formation flying. The free flying model, essentially a double integrator, results from discarding small terms in the relative spacecraft equations of motion. While the magnitude of these discarded terms may be small, one must show that their dynamic effects are small as compared to the precision performance requirements. We do so by deriving a theoretical method for bounding the difference between the solution of a nonlinear truth model of the relative translational spacecraft dynamics and a Simplified linear time-invariant model. Presently, the method incorporates feedforward and static output feedback control. The method is applied to a Terrestrial Planet Finder- based example. Using only feedforward control (guidance) the free-flying model and a Hill- Clohessy- Wiltshire Equations-based model are shown to be accurate to 1 c m for up to 4 and 30 hours, respectively. Also shown is that the simplest free-flying model may not be sufficient for low-gain feedback control design-closed-loop tracking errors can be as large as 8 meters.
    Type: International Symposium on Formation Flying Missions and Technologies; Toulouse; France
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  • 4
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    An Overview of the Formation and Attitude Control System for the Terrestrial Planet Finder Formation Flying Interferometer (2004)
    In:  CASI
    Details
    Publication Date: 2018-06-06
    Description: The Terrestrial Planet Finder formation flying Interferometer (TPF-I) will be a five-spacecraft, precision formation operating near the second Sun-Earth Lagrange point. As part of technology development for TPF-I, a formation and attitude control system (FACS) is being developed that achieves the precision and functionality needed for the TPF-I formation and that will be demonstrated in a distributed, real-time simulation environment. In this paper we present an overview of FACS and discuss in detail its formation estimation, guidance and control architectures and algorithms. Since FACS is currently being integrated into a high-fidelity simulation environment, component simulations demonstrating algorithm performance are presented.
    Keywords: Spacecraft Design, Testing and Performance
    Type: Proceedings from the 2nd International Symposium on Formation Flying Missions and Technologies; NASA/CP-2005-212781
    Format: application/pdf
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  • 5
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    Formation Algorithms and Simulation Testbed (2004)
    In:  CASI
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    Publication Date: 2018-06-06
    Description: Formation flying for spacecraft is a rapidly developing field that will enable a new era of space science. For one of its missions, the Terrestrial Planet Finder (TPF) project has selected a formation flying interferometer design to detect earth-like planets orbiting distant stars. In order to advance technology needed for the TPF formation flying interferometer, the TPF project has been developing a distributed real-time testbed to demonstrate end-to-end operation of formation flying with TPF-like functionality and precision. This is the Formation Algorithms and Simulation Testbed (FAST) . This FAST was conceived to bring out issues in timing, data fusion, inter-spacecraft communication, inter-spacecraft sensing and system-wide formation robustness. In this paper we describe the FAST and show results from a two-spacecraft formation scenario. The two-spacecraft simulation is the first time that precision end-to-end formation flying operation has been demonstrated in a distributed real-time simulation environment.
    Keywords: Space Sciences (General)
    Type: Proceedings from the 2nd International Symposium on Formation Flying Missions and Technologies; NASA/CP-2005-212781
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  • 6
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    Decentralized and self-centered estimation architecture for formation flying of spacecraft (2001)
    In:  Other Sources
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    Publication Date: 2018-06-08
    Description: Formation estimation methodologies for distributed spacecraft systems are formulated and analyzed. A generic form of the formation estimation problem is described by defining a common hardware configuration, observation graph, and feasible estimation topologies.
    Type: 16th International Symposium on Space Flight Dynamics; Pasadena, CA; United States
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  • 7
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    Rule-based estimation and control of formation flying spacecraft (2001)
    In:  Other Sources
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    Publication Date: 2018-06-08
    Description: This paper addresses some estimation and control problems specific to formation flying of spacecraft that can be approached with rule or logic based methodologies.
    Type: 2nd International Conference on Intelligent Technologies (InTech 2001); Bangkok; Thailand
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  • 8
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    A survey of formation flying guidance (2002)
    In:  Other Sources
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    Publication Date: 2018-06-08
    Type: International Symposium on Formation Flying Missions and Technologies; Toulouse; France
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  • 9
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    On the validity of the double integrator approximation in deep space formation flying (2002)
    In:  Other Sources
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    Publication Date: 2018-06-08
    Type: International Symposium on Formation Flying Missions and Technologies; Toulouse; France
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  • 10
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    The effects of Interspacecraft communication data latency and time tag error on formation estimation (2002)
    In:  Other Sources
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    Publication Date: 2018-06-08
    Keywords: Communications and Radar
    Type: International Symposium on Formation Flying Missions and Technologies; Toulouse; France
    Format: text
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