Results 211 to 220 of about 14,731 (266)

Starshade formation flying II: formation control

Journal of Astronomical Telescopes, Instruments, and Systems, 2020
Several starshade concepts for imaging exo-Earths would operate at the second Earth–Sun Lagrange point (L2) and consist of a starshade flying in formation tens to hundreds of thousands of kilometers from a telescope. The starshade would need to maintain meter-level lateral alignment with the line of sight from telescope to target star.
Thibault L. B. Flinois, Daniel P. Scharf, Carl R. Seubert, Michael Bottom, Stefan R. Martin   +4 more
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Distributed Computing for Formation Flying Missions

IEEE International Conference on Computer Systems and Applications, 2006., 2006
There is a continuing trend in the space community to reduce costs involved in space missions. Miniaturization has been the primary method that was deployed for reducing space mission costs. This is now changing, due to the recent advancements in technology that enable advanced mission architectures namely, distributed spacecraft missions.
Abdul-Halim M. Jallad, Tanya Vladimirova
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Tight formation flying and sphere packing

2007 American Control Conference, 2007
In this paper, we introduce a method for finding a tight formation of unmanned air vehicles (UAVs) via the classical sphere packing scheme. We first translate the tight formation finding problem to the problem of maximizing the second smallest eigenvalue lambda2(G) of the graph Laplacian LG.
Kim, Y, Gu, D-W, Postlethwaite, I
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Optimal Reconfiguration of Formation Flying Satellites

Proceedings of the 44th IEEE Conference on Decision and Control, 2006
We employ a recently developed new technique for the numerical treatment of optimal control problems for mechanical systems in order to compute optimal open loop control laws for the reconfiguration of a group of formation flying satellites. The method is based on a direct discretization of a variational formulation of the dynamical constraints.
Oliver Junge, Sina Ober-Blöbaum
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On-the-Fly Donut Formation in Compiled Memory

2015 28th International Conference on VLSI Design, 2015
Timing data collection through memory compiler characterization is an integral part of memory compiler development. Simulations are run on an exhaustive instances list to cover the whole compiler range. Full characterization taxes resources immensely, both in terms of time and disk space. This paper focusses on on-the-fly donut creation methodology for
Darvinder Singh, Isha Garg, Vineet Sachan, Prasanna Nalawar   +3 more
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Spacecraft Formation Flying

2012
Spacecraft formation flying is an important application of networked dynamical systems. Attitude control of the spacecraft is an indispensable (many applications place strict requirements on it) and difficult (due to the nonlinear dynamics) problem being studied for decades.
Ziyang Meng, Tao Yang, Karl H. Johansson
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Adaptive learning control for spacecraft formation flying

Proceedings of the 40th IEEE Conference on Decision and Control (Cat. No.01CH37228), 2002
Considers the problem of spacecraft formation flying in the presence of periodic disturbances. In particular, the nonlinear position dynamics of a follower spacecraft relative to a leader spacecraft are utilized to develop a learning controller which accounts for the periodic disturbances entering the system model.
Hong Wong, Haizhou Pan, Marcio S. de Queiroz, Vikram Kapila   +3 more
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A formation flying algorithm for autonomous underwater vehicles

IEEE Conference on Decision and Control and European Control Conference, 2011
A control algorithm for the problem of formation flying for autonomous underwater vehicles is presented. Using a restrictive communication scheme and LQ optimal control, the control algorithm respects the limitations of underwater communication and on-board computing power.
P.L. Kempker (Pia), A.C.M. Ran, J.H. van Schuppen (Jan)   +2 more
openaire   +3 more sources

Formation flying in elliptical orbits

2000 IEEE Aerospace Conference. Proceedings (Cat. No.00TH8484), 2002
We present a general approach to the analysis of the formation flying problem, based on FreeFlyer(R) and MATLAB(R), that is designed with spacecraft formations in mind. With this approach, we are able to quickly combine new algorithms for the initialization and control of a formation within the context of a high-fidelity operational tool. As an example,
C. Schiff, D. Rohrbaugh, J. Bristow
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On the formation flying of satellite constellations

Chinese Astronomy and Astrophysics, 2004
Abstract From the viewpoint of orbit dynamics, the formation flying of the satellites of a constellation and the accompanying flying in satellite-satellite tracking are affected by the following dynamical mechanisms: (1) The main characteristics of the variations of disturbed orbits determine the space configuration of the satellites.
Lin Liu, Hai-hong Wang, Jian-bo Ma
openaire   +1 more source