Results 81 to 90 of about 1,938 (262)

EU Space Law and Earth's Boundaries: Integrating Environmental Impact Assessment and Corporate Due Diligence

Global Policy, EarlyView.
ABSTRACT The European Union's proposed Space Law aims to establish a unified approach for sustainable space activities across the EU. While the EU's satellite constellations contribute to sustainability efforts, they can also have negative environmental impacts.
Elena Cirkovic, Vitali Braun
wiley   +1 more source

PRISMA - Formation Flying Project Close to Launnch [PDF]

, 2010
The PRISMA project is a technical demonstration mission for formation flying and rendezvous in space. The mission can be considered as an in-obit test-bed where different experiments involving Guidance, Navigation and Control (GNC) algorithms, sensors ...
Persson, S., Jörgensen, John, Harr, J., Joergensen, J., Harr, Jon, D'Amico, Simone, D'Amico, S., Persson, Staffan   +7 more
core  

The Great Cosmic Silence: What Does the Fermi Paradox Tell About the Future of Humanity?

Global Policy, EarlyView.
ABSTRACT This article examines how institutional time horizons shape the long‐term survival prospects of human technological civilisation. While research on global catastrophic and existential risks has expanded, the temporal structures of political‐economic institutions remain underexamined.
Heikki Patomäki
wiley   +1 more source

Fuzzy Sliding Mode for Spacecraft Formation Control in Eccentric Orbits [PDF]

فصلنامه علوم و فناوری فضایی, 2014
The problem of relative motion control for spacecraft formation flying in eccentric orbits is considered in this paper. Due to the presence of nonlinear dynamics and external disturbances, a robust fuzzy sliding mode controller is developed.
A. Imani, M. Bahrami
doaj  

Optimal sliding mode tracking control of spacecraft formation flying with limited data communication

Advances in Mechanical Engineering, 2018
This article deals with the optimal tracking control problem for spacecraft formation flying via a sliding mode approach in the presence of external disturbances and signal quantization, where both state quantization and input quantization are considered.
Ruixia Liu, Ming Liu, Xibin Cao, Yuan Liu   +3 more
doaj   +1 more source

TanDEM-X Close Formation Flight AOCS Safety Measures and Operations [PDF]

, 2011
The TanDEM-X project is implemented by a “Public-Private Partnership” between the German Aerospace Centre (DLR) and Astrium GmbH. The primary goal of the TanDEM-X (TerraSAR-X add-on for Digital Elevation Measurement) mission is to generate a global ...
Schulze, Daniel, Herman, Jacobus, Löw, Sebastian   +2 more
core  

How iteration frequencies affect project uncertainty and risk ‐ An empirically elaborated model

Decision Sciences, EarlyView.
Abstract Iterative approaches have gained prominence in new product development (NPD) projects in response to increasingly dynamic and turbulent business environments. In this article, we study how iteration frequency—that is, the rhythm at which development teams revisit and test comprehensive products—affects an NPD project's uncertainty and risk. We
Timo Kalmes, Fabian J. Sting
wiley   +1 more source

Decentralized State Estimation Algorithm of Centralized Equivalent Precision for Formation Flying Spacecrafts Based on Junction Tree

International Journal of Aerospace Engineering, 2015
As centralized state estimation algorithms for formation flying spacecraft would suffer from high computational burdens when the scale of the formation increases, it is necessary to develop decentralized algorithms.
Mengyuan Dai, Hua Mu, Meiping Wu, Zhiwen Xian   +3 more
doaj   +1 more source

Adaptive Tracking Control for Spacecraft Formation Flying System via Modified Fast Integral Terminal Sliding Mode Surface

IEEE Access, 2020
In this paper, the fast integral terminal sliding mode control for spacecraft formation flying system is concerned subjected to external disturbances and parametric uncertainties. First, a novel modified fast integral terminal sliding mode control law is
Xiaohan Lin, Xiaoping Shi, Shilun Li
doaj   +1 more source

Visible, near‐, and thermal infrared spectra of asteroid Bennu samples: Relationship to and implications for remote sensing of carbonaceous asteroids

Meteoritics &Planetary Science, EarlyView.
Abstract Remote spectroscopy is used to characterize the mineralogy and infer the history of planetary bodies. Carbonaceous asteroids, such as B‐type (101955) Bennu, represent the earliest stages of planet formation. B types have a blue (negative) spectral slope and comprise <5% of asteroids.
V. E. Hamilton, E. A. Cloutis, R. E. Milliken, P. Haenecour, D. R. Golish, K. J. Domanik, T. J. McCoy, L. P. Keller, A. A. Simon, H. H. Kaplan, C. A. Goodrich, S. A. Sandford, D. Applin, T. Hiroi, D. H. Hill, N. G. Lunning, F. M. McCubbin, S. A. Eckley, C. J. Snead, E. H. Blumenfeld, J. E. Aebersold, C. Schultz, N. Bowles, K. A. Shirley, S. S. Russell, J. J. Barnes, T. J. Zega, D. N. DellaGiustina, A. J. Ryan, D. P. Glavin, J. P. Dworkin, H. C. Connolly Jr., D. S. Lauretta   +32 more
wiley   +1 more source