Results 111 to 120 of about 1,653 (191)

Active Spacecraft Potential for Cluster – implementation and first results

, 2001
Annales Geophysicae, 1289-1302 ...
Torkar, K., Riedler, W., Escoubet, C.P., Fehringer, M., Schmidt, R., Grard, R.J.L., Arends, H., Rudenauer, F., Steiger, W., Narheim, B.T., Svenes, K., Torbert, R., Andre, M., Fazakerley, A., Goldstein, R., Olsen, R.C., Pedersen, A., Whipple, E., Zhao, H.   +18 more
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Multiple-spacecraft clustering by piecewise linear quadratic control

Multiple-spacecraft clustering by piecewise linear quadratic control
複数の人工衛星が地球周回軌道の1部を囲む有界領域を航行させるためのニアミス回避・燃費低減・自動制御を満たす軌道誘導則は線形力学であるにもかかわらず未だ構成されていない。導出の指針を得るために、より単純化されたモデルである自由空間の1次元航行をする複数宇宙機において3条件を満たす協調制御を解析した。宇宙機が2機あるいは3機の場合に、2機のニアミスを消費燃料最小の自動制御で回避する誘導則を導いた。しかし、3機によるニアミス回避を低燃費で行なうことが証明されなかったため、大域的な探索をするために区分2次となるペナルティ関数による最適化を試みる指針を与える。 Fuel-minimum optimization of one-dimensional traffic by multiple-spacecraft
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Generating Planar Trajectories for Neptunian System Exploration Using Motion Primitives. [PDF]

J Astronaut Sci
Miceli GE, Bosanac N.
europepmc   +1 more source

A Dataset of Lower Band Whistler Mode Chorus and Exohiss with Instrumental Noise Thresholds. [PDF]

Sci Data
Santolík O, Kolmašová I, Taubenschuss U, Hanzelka M, Hartley DP.   +4 more
europepmc   +1 more source

IMAP's Role in Understanding Particle Injection and Energization Throughout the Heliosphere. [PDF]

Space Sci Rev
Cohen CMS, Alterman BL, Baker DN, Bruno A, Bzowski M, Christian ER, Cohen IJ, Dalla S, Dayeh MA, Desai MI, Elliott HA, Giacalone J, Gkioulidou M, Guo F, Horbury T, Kanekal SG, Kowalska-Leszczyńska I, Lee CO, Livadiotis GI, Luhmann JG, Matthaeus WH, McComas DJ, Mitchell JG, Moebius E, Rankin J, Richardson JD, Schwadron NA, Skoug R, Turner D, Zank G, Zirnstein EJ.   +30 more
europepmc   +1 more source

Simulation of the cluster spacecraft floating probe potential

Simulation of the cluster spacecraft floating probe potential
In this study, a numerical model of the relationship between the double probe potential with respect to spacecraft potential and the plasma parameters (density, temperature...) has been developed. A fit of the data between 1 and 80/cu cm has been performed which allows to calibrate the model with suitable parameters for the photoelectron emission.
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Optimal Finite Difference Angular Velocity Estimation for Spacecraft. [PDF]

J Astronaut Sci
Leo JP, Enright JP.
europepmc   +1 more source

Triboelectric Nanogenerators for Future Space Missions. [PDF]

Nanomicro Lett
Shaukat RA, Rehman MM, Khan M, Chang R, Iorio CS, Samad YA, Shi Y.   +6 more
europepmc   +1 more source

New Technologies for Miniaturized Spacecraft and Multi-Point Cluster Missions

, 1999
ABSTRACT The Johns Hopkins University Applied Physics Laboratory is currently preparing for its next generation of low Earth orbiting and deep space missions. Auroral Multi-Scale (AMS) is one of those missions. The mission uses four miniature (36 kg each) spacecraft to perform high resolution multi-point electric and magnetic field measurements of ...
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Chang'E-6 reveals solar wind-dependent H^- ions on the Moon. [PDF]

Sci Adv
Zhong T, Xie L, Zhang A, Wieser M, Wang W, Holmström M, Canu-Blot R, Li L, Barabash S, Zou Y, Zhang Y, Yan Q, Wen W, Deng X, Cao H, Wang C.   +15 more
europepmc   +1 more source