Concept
Constellation de satellites
Publications associées (37)
The imprint of galaxy mergers on satellite planes in a cosmological context
Flattened and kinematically correlated planes of dwarf satellite galaxies have been observed in the Local Volume. The slinging out of satellites during host galaxy mergers has been suggested as a formation mechanism for these peculiar structures. We statis ...
2023Semantic Perturbations with Normalizing Flows for Improved Generalization
Martin Jaggi, Sebastian Urban Stich, Tatjana Chavdarova
Data augmentation is a widely adopted technique for avoiding overfitting when training deep neural networks. However, this approach requires domain-specific knowledge and is often limited to a fixed set of hard-coded transformations. Recently, several work ...
IEEE2021Re-entry survival analysis and ground risk assessment of space debris considering by-products generation
Pénélope Leyland, Stefano Mischler, Seong-Hyeon Park
Space debris that re-enter the Earth's atmosphere can be partially or fully ablated along the trajectory path after hitting the atmosphere layers, once these become denser (approximately below 82 km). This paper combines re-entry survival analysis to by-pr ...
2020Doppler-based positioning using LEO augmented satellite constellation - Simulations of perspectives
The Global Navigation Satellite System (GNSS) refers to a constellation of satellites emitting signals from space, used to provide Position, Navigation and Timing (PNT) services to the receivers on Earth. Nowadays, the GNSS is exploited in a wide range of ...
2020QUIC: Opportunities and threats in SATCOM
Emmanuel Qays Dubois, Ludovic Bernard Gérard Thomas
This article proposes a discussion on the strengths, weaknesses, opportunities and threats related to the deployment of QUIC end-to-end from a satellite-operator point-of-view. The deployment of QUIC is an opportunity for improving the quality of experienc ...
IEEE2020X-ray pulsar-based GNC system for formation flying in high Earth orbits
Volker Gass, Camille Sébastien Pirat
In this paper, comprehensive pulsar-based Guidance, Navigation and Control (GNC) system is designed and applied to satellites formation flying. The complete autonomy of the X-ray pulsar navigation technology provides both absolute and relative positioning ...
PERGAMON-ELSEVIER SCIENCE LTD2020LDPC Coded Multiuser Shaping for the Gaussian Multiple Access Channel
Alexios Konstantinos Balatsoukas Stimming
The joint design of input constellation and low-density parity-check (LDPC) codes to approach the symmetric capacity of the two-user Gaussian multiple access channel is studied. More specifically, multilevel coding is employed at each user to construct a h ...
IEEE2019Four-Port Broadband Orthomode Transducer Enabling Arbitrary Interelement Spacing
Juan Ramon Mosig, Anja Skrivervik, Emile Jacques de Rijk, Tomislav Debogovic, Maria Garcia Vigueras, Santiago Capdevila Cascante, Esteban Menargues Gomez
This paper reports a novel methodology to design broadband orthomode transducers with two arbitrarily spaced ports carrying orthogonal linear polarizations. The component is based on a combination of two Boifot junctions through a series of power dividers ...
2018Compact Orthomode Transducer with Broadband Beamforming Capability
Juan Ramon Mosig, Anja Skrivervik, Emile Jacques de Rijk
A compact and broadband orthomode transducer (OMT) with two dual linearly polarized ports is reported here for the first time. The component is based on a combination of two ridged Boifot junctions through a series of power dividers that act as an embedded ...
IEEE2018Cost-effective dual-polarised leaky-wave antennas enabled by three-dimensional printing
Juan Ramon Mosig, Emile Jacques de Rijk, Tomislav Debogovic, Maria Garcia Vigueras, Esteban Menargues Gomez
This study proposes a compact dual-polarised directive radiator whose complex prototyping is enabled by additive manufacturing. In addition to monolithic implementation, stereolitography followed by metal coating, it also provides high radio-frequency perf ...
Inst Engineering Technology-Iet2017