Results 21 to 30 of about 22,923 (213)
Investigating the Test and Evaluation of GaN Transistors Radiation Resistance in SSPA Amplifier Board in LEO Satellite Payload [PDF]
فصلنامه علوم و فناوری فضایی, 2023 With the advent of GaN technology, achieving microwave power with high efficiency by solid-state devices has become more available. Therefore, the use of SSPA amplifiers with GaN technology in satellites, especially LEO satellites, has been considered ...
Roghieh Karimzadeh Baee +3 more
doaj +1 more source
Design of Satellite Operations Subsystem Using Dynamic Fault Management Mechanism [PDF]
Journal of Astronomy and Space Sciences, 1998 Satellite Operations Subsystem in the Mission Control Element provides real-time monitoring of the satellite status and transmits telecommands to control the satellite during the contact time.
Jaehoon Kim, Heesook Mo, Woonchan Jung
doaj
Gap Analysis in Satellite Communication Services [PDF]
فصلنامه علوم و فناوری فضایی, 2023 The national information network is being implemented with the aim of providing the services needed by the people through internal infrastructure and independent of international internet platforms.
Leila Mohammadi +3 more
doaj +1 more source
NORAD TLE Type Orbit Determination of LEO Satellites Using GPS Navigation Solutions [PDF]
Journal of Astronomy and Space Sciences, 2002 NORAD Two Line Elements (TLE) are widely used for the increasing number of small satellite mission operations and analysis. However, due to the irregular periodicity of generation of the NORAD TLE, a new TLE that is independent of NORAD is required.
Chang-Hwa Cho +4 more
doaj +1 more source
EAI Endorsed Transactions on Mobile Communications and Applications, 2017 The state of insecurity occasioned by fraudulent practices in Africa has been of concern economically, both at home and abroad. In this paper, we propose ways to mitigate this problem, using Nigeria as a case study.
M.I. Adeka +8 more
doaj +1 more source
Comparison of Landscape Metrics for Three Different Level Land Cover/Land Use Maps
ISPRS International Journal of Geo-Information, 2018 This research aims to investigate how different landscape metrics are affected by the enhancement of the thematic classes in land cover/land use (LC/LU) maps.
Elif Sertel +4 more
doaj +1 more source
Experimental Satellite Quantum Communications [PDF]
Physical Review Letters, 2015 Quantum Communications on planetary scale require complementary channels including ground and satellite links. The former have progressed up to commercial stage using fiber-cables, while for satellite links, the absence of terminals in orbit has impaired theirs development.
VALLONE, GIUSEPPE +6 more
openaire +4 more sources
Analytical Study on Mission Control Element System Availability for Korea Multipurpose Satellite (KOMPSAT) I [PDF]
Journal of Astronomy and Space Sciences, 1998 To estimate the availability of the MCE for KOMPSAT I, mathematical models of H/W and S/W availability, the availability estimating methods for parallel and redundant system were presented. Furthermore, to improve and estimate the MCE system availability,
J. W. Eun, D. I. Chang, J. M. Kim
doaj
Физика волновых процессов и радиотехнические системы, 2021 Connecting to the Internet whenever and wherever you travel is no longer a luxury. All people have the ability to connect to the Internet and share data away from home.
Yuri G. Pasternak +3 more
doaj +1 more source
Satellite communications for fighters [PDF]
Proceedings of MILCOM '93 - IEEE Military Communications Conference, 2002 WIth the demise of the Soviet Union, the threat to the US and its allies has changed. Instead of a single advisory and a defined theater of battle, US forces face worldwide deployment in support of peace keeping activities and regional conflicts. In the new world order, US Forces will require flexible, worldwide, jam-resistant, low-probability-of ...
openaire +2 more sources