Results 21 to 30 of about 1,473,928 (304)

Tracking systems for satellite communications

IEE Proceedings F Communications, Radar and Signal Processing, 1988
During the past twenty years or so a considerable amount of work has gone into the development of tracking schemes for satellite communication systems. Here a review of the various techniques is presented. For each method used the principle of operation is described and the various salient features extracted.
Hawkins, GJ, Edwards, DJ, McGeehan, JP
openaire   +3 more sources

Air and satellite traffic control and tracking [PDF]

, 2023
Control and tracking of air and satellite traffic is carried out by official international and state systems.
Kolchevsky, N. N., Boikа, F. V., Balukho, I. N., Beglik, V. V.   +3 more
core   +1 more source

Channel Phase Calibration for High-Resolution and Wide-Swath SAR Imaging with Doppler Spectrum Sharpness Optimization

Sensors, 2022
Channel phase calibration is a crucial issue in high resolution and wide swath (HRWS) imagery with azimuth multi-channel synthetic aperture radar (SAR) systems.
Man Zhang, Sha Huan, Zeya Zhao, Zhibin Wang   +3 more
doaj   +1 more source

Preliminary Study on Double Enhanced Raman Scattering Detection of Gas Phase Trace Explosives

IEEE Access, 2020
The demand of continuous detection technology for gas phase trace explosives (GPTE) in explosion-proof stability maintenance, public security, explosive security storage and other occasions is summarized.
Zhibin Chen, Mengze Qin, Cheng Xiao
doaj   +1 more source

Architecture design of BeiDou global navigation signals

Geo-spatial Information Science
Navigation signals play a crucial role in determining the performance and user experience of Global Navigation Satellite System (GNSS). In recent years, GNSSs have been actively modernizing their signal architectures to meet the increasing demand for ...
Shuren Guo, Chengeng Su, Feiren Lv
doaj   +1 more source

Dynamic thermal and IT resource management strategies for data center energy minimization

Journal of Cloud Computing: Advances, Systems and Applications, 2017
Energy-hungry data centers attract researchers’ attention to energy consumption minimization–a challenge confronted by both industry and academia. To assure the server reliability, its instantaneous temperature is generally controlled within a preset ...
Lijun Fu, Jianxiong Wan, Jie Yang, Dongdong Cao, Gefei Zhang   +4 more
doaj   +1 more source

A State-Space Approach for Tracking Doppler Shifts in Radio Inter-Satellite Links

IEEE Access, 2021
The high Doppler effects in satellite communications make the equivalent channels fast varying, which leads to channel estimation difficulties and the need for high channel estimation overheads.
Pedro Pedrosa, Daniel Castanheira, Adao Silva, Rui Dinis, Atilio Gameiro   +4 more
doaj   +1 more source

Remote sensing mission sentinel pro: Analysis of satellite tracking, control, and health monitoring system with solar tracking capability [PDF]

Nowadays, satellite systems are experiencing noticeable disruptive issues due to the single functionality, high cost of operations, and limited adaptability. This paper presents a satellite mission control system with RF duplex communication, which gives
Baig, M. W., Muhammad W. Baig, Mahmoud Shafik, Shafik, M.   +3 more
core   +1 more source

From energy provision to protein synthesis: Tunnelling nanotubes as mediators of intercellular metabolic cooperation in cancer

FEBS Open Bio, EarlyView.
The cytoskeleton‐mediated transport of mitochondria via tunnelling nanotubes restores respiration, increases ATP production, rescues cells from apoptosis, activates the AKT/mTOR signalling pathway, promotes cell migration and invasiveness, contributes to cancer progression and treatment resistance.
Stanislava Martínková, Jan Trnka
wiley   +1 more source

Subclinical Optic Nerve Involvement in Radiologically Isolated Syndrome: Multimodal Detection and Diagnostic Impact

Annals of Clinical and Translational Neurology, EarlyView.
ABSTRACT Objectives We aimed to determine the frequency of subclinical optic nerve (ON) lesions using MRI, optical coherence tomography (OCT), and visual evoked potentials (VEP) in radiologically isolated syndrome (RIS), and to assess their diagnostic and prognostic significance.
Christine Lebrun‐Frenay, Cassandre Landes‐Château, Lydiane Mondot, Mikael Cohen, Margherita Popolo, Jérôme de Seze, Bertrand Bourre, Françoise Durand‐Dubief, Olivier Casez, Orhun H. Kantarci, Aksel Siva, Stephanie Baillif, Darin T. Okuda, Letizia Leocani   +13 more
wiley   +1 more source