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Innovative Autonomous Control Systems for Formation Flying Using GPS and LQG/LTR Controllers

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This project focuses on the development of a unified architecture for orbit and attitude control systems that maintain formation flying using GPS code and phase pseudorange data. We applied nonlinear feedback control techniques to address the complexities of nonlinear attitude dynamics and kinematics. Accomplishments include the development of a 'leader of the fleet' reference system for relative navigation and receiving a US patent for our autonomous unified control system. Our software is available as a plugin to Analytical Graphics' Satellite Toolkit and is set to be utilized in government projects.

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Innovative Autonomous Control Systems for Formation Flying Using GPS and LQG/LTR Controllers

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  1. Small Business Innovation Research Autonomous Unified Orbit and Attitude Control for Formation Flying using GPS and LQG/LTR Controller Space Products & ApplicationsFairfax VA • INNOVATION • Unified architecture for orbit and attitude control system. • Maintains formation pattern and attitude control using GPS code and phase pseudorange data. • Application of nonlinear feedback control technique to solve the nonlinear attitude dynamics and kinematics problem. • ACCOMPLISHMENTS • Developed ‘leader of the fleet’ reference system for relative navigation using feedback control. • SPA received US Patent No. 6,341,249, Autonomous Unified on-Board Orbit and Attitude Control System for Satellites. • Extending Formation Control to include automated rendezvous and docking capability. COMMERCIALIZATION • SPA’s nonlinear attitude tracking control and orbit feedback software is being offered as a ‘plug-in’ to Analytical Graphics’s Satellite Tool Kit commercial software. • SPA has developed these products as a ‘development partner’ of Analytical Graphics, Inc. of Malvern, PA. • GOVERNMENT/SCIENCE APPLICATIONS • Formation Control expected to be applied on NRO’s Passive Imaging Millimeterwave Interferometry (PIMI) project. • AeroAstro Inc. has selected SPA to provide subcontracting help on this study project. Points of Contact: NASA – Dave Folta (301) 286-6082 SPA -Shabbir Parvez(703) 713-1956 Goddard Space Flight Center 1997 Phase II, SS5-077

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