Results 11 to 20 of about 1,766,714 (261)

On the role of satellite communications for emergency situations with a focus on Europe [PDF]

open access: yes, 2011
International audienceIn this paper, we describe how satellite communications may contribute to disaster management. During emergency situations, satellite communications present many advantages in supporting or replacing a terrestrial infrastructure (if
Matteo Berioli   +14 more
core   +1 more source

Automatic Detection of Mining Subsidence using InSAR and YOLOv11 Model [PDF]

open access: yesThe International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences
Underground coal mining will cause serious ground subsidence and affect the life and property safety of surrounding residents. Deep learning provides the possibility to process a large amount of data information, and can provide an effective model based ...
L. Chen   +5 more
doaj   +1 more source

Design and Implementation of the Mission Planning Functions for the KOMPSAT-2 Mission Control Element [PDF]

open access: yesJournal of Astronomy and Space Sciences, 2003
Spacecraft mission planning functions including event prediction, mission scheduling, command planning, and ground track display have been developed for the KOMPSAT-2 mission operations.
Byoung-Sun Lee, Jae-Hoon Kim
doaj   +1 more source

Peak-to-Average Power Ratio of Multicarrier Faster-Than-Nyquist Signals: Distribution, Optimization and Reduction

open access: yesIEEE Access, 2018
Multicarrier faster-than-Nyquist (MFTN) is a spectral efficient transmission scheme for future communication systems. However, as one of the most important drawbacks of multicarrier transmission systems, the peak-to-average power ratio (PAPR) of MFTN ...
Aijun Liu   +5 more
doaj   +1 more source

Analysis of the Motion of a Tether-Perturbed Satellite [PDF]

open access: yesJournal of Astronomy and Space Sciences, 2003
The motion of each satellite in a tethered satellite system is non-Keplerian in the Earth's gravitational field. In this paper, the tether perturbation force is formulated and compared with the perturbation force due to the Earth's oblateness.
Sungki Cho, Jaehoon Kim
doaj   +1 more source

Research Trends in Direct Satellite Communications Technology with Smart Terrestrial Equipment: A Scien-tometric Analysis in Scopus [PDF]

open access: yesپژوهشنامه علم سنجی
Purpose: Direct satellite communication with ground-based devices, as an emerging technology in the satellite communications field, has garnered significant interest from the space industry in recent years.
Marzieh Ahmadi   +3 more
doaj   +1 more source

A new low profile antenna with improved performance for satellite on-the-move communications [PDF]

open access: yes, 2009
A novel design solution for a low-profile fullduplex Satellite-On-The-Move Communications hybrid scanned phased array antenna for low elevation angle coverage (down to 10°) is described. The antenna is operated at Ku-Band.
Yuanyuan Jiang   +7 more
core   +1 more source

An Enhanced Multiple Random Access Scheme for Satellite Communications [PDF]

open access: yes, 2012
In this paper, we introduce Multi-Slots Coded ALOHA (MuSCA) as a multiple random access method for satellite communications. This scheme can be considered as a generalization of the Contention Resolution Diversity Slotted Aloha (CRDSA) mechanism. Instead
Bui, Huyen-Chi   +6 more
core   +1 more source

PAPR Reduction of Multicarrier Faster-Than-Nyquist Signals With Partial Transmit Sequence

open access: yesIEEE Access, 2017
Multicarrier faster-than-Nyquist (MFTN) signaling is a spectral efficient transmission scheme for future communication systems. Similar as general multicarrier signals, the high peak-to-average power ratio (PAPR) is also one of the main drawbacks of MFTN
Siming Peng   +3 more
doaj   +1 more source

IP-Level Satellite Link Emulation with KauNet [PDF]

open access: yes, 2009
Distributed applications and transport protocols communicating over a satellite link may react very strongly to conditions specific to that kind of link.
Garcia, Johan,   +12 more
core   +1 more source

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