Results 151 to 160 of about 470,498 (200)
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LISA satellite formation control
Advances in Space Research, 2007Abstract The joint ESA–NASA Laser Interferometer Space Antenna (LISA) mission consists of a triangular formation of three satellites aiming at detecting gravitational waves. In linear approximation the LISA satellites describe a circle around a reference point, maintaining a fixed position with respect to each other.
J.J.C.M. Bik +2 more
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Nonlinear Tracking Control for Satellite Formations
Journal of Guidance, Control, and Dynamics, 2002A tracking control law using a sliding mode framework is derived to control a satellite formation. Hill's relative motion equations are used to model the follower satellite's motion relative to the leader. To minimize fuel required to maintain the formation, each satellite is constrained to reside near a natural orbit.
null Hsi-Han Yeh, E. Nelson, A. Sparks
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Formation Flying Satellites: Control By an Astrodynamicist
Celestial Mechanics and Dynamical Astronomy, 2001Potential periodic formation orbits can be identified using Hill's equation. However, as gravitational perturbations destroy the periodicity, a control is required to maintain the desired orbits. Here, the authors address the control of individual satellites as well as the control of the whole constellation.
Alfriend, Kyle T. +2 more
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Satellite Formation Flying Maneuver Control
Mekhatronika, Avtomatizatsiya, Upravlenie, 2019A problem of a formation flying satellites maneuver control is presented. Among the most important criteria for satellite formation flying control system are active period maximization, precision of the configuration, secure motion (without collisions of satellites).
M. V. Palkin, I. P. Titkov
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Icarus, 1978
A satellite formation model is extended to include evolution of planetary ring material and elliptic orbital motion. In this model the formation of the moon begins at a later time in the growth of the earth, and a significant fraction of the lunar material is processed through a circumterrestrial debris cloud where volatiles might have been lost. Thus,
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A satellite formation model is extended to include evolution of planetary ring material and elliptic orbital motion. In this model the formation of the moon begins at a later time in the growth of the earth, and a significant fraction of the lunar material is processed through a circumterrestrial debris cloud where volatiles might have been lost. Thus,
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Vision Assisted Satellite Formation Control
Proceedings of the 45th IEEE Conference on Decision and Control, 2006This paper examines a complete solution to autonomous formation flying of satellites where problems of position, velocity and attitude estimation, data fusion across the cluster, constrained actuators, fuel efficient manoeuvres, actuator misalignment and robustness are all considered.
S. M. Veres, N. K. Lincoln
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Multi-satellite formation and reconfiguration
Proceedings of the 2000 American Control Conference. ACC (IEEE Cat. No.00CH36334), 2000This paper addresses the problem of formation and reconfiguration of multiple micro-satellite systems. A control scheme, called the perceptive frame, is adopted which integrates the decentralized feedback of each satellite with online sensor information to achieve the goal of formation keeping and intersatellite coordination.
W. Kang, A. Sparks, S. Banda
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Decentralized control of satellite formations
International Journal of Robust and Nonlinear Control, 2002AbstractA decentralized architecture is proposed for autonomous establishment and maintenance of satellite formations. Such an architecture does not require a central supervisor, as the spacecraft can cooperatively track planned maneuvers and trajectories in the face of disturbances and uncertainties, while processing only local measurement information.
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Formation of multimers of linear satellite RNAs
Virology, 1991A 22-base region of turnip crinkle virus satellite-RNA C (sat-RNA C) is involved in the accumulation of monomeric and dimeric forms. Deletions within the region inhibited the accumulation of sat-RNA C monomers. However, normal ratios of dimers to monomers occurred if the 22 bases were replaced by 22 unrelated bases or if the location of this region was
C D, Carpenter, P J, Cascone, A E, Simon
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Optimal satellite formation reconfiguration actuated by inter-satellite electromagnetic forces
Acta Astronautica, 2013Abstract The inter-satellite electromagnetic forces generated by the magnetic dipoles on neighboring satellites provide an attractive control actuation alternative for satellite formation flight due to the prominent advantages of no propellant consumption or plume contamination.
Wei-wei Cai +3 more
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