摘要 :
The IAA study group 4.18, "Definition and Requirements of Small Satellites Seeking Low-Cost and Fast-Delivery", was initiated in 2014. Its objectives are to examine the definitions of small satellites, identify the requirements ev...
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The IAA study group 4.18, "Definition and Requirements of Small Satellites Seeking Low-Cost and Fast-Delivery", was initiated in 2014. Its objectives are to examine the definitions of small satellites, identify the requirements every satellite should follow regardless of its size or development philosophy and then reflect some of the findings to the ISO draft. After a series of meetings, the final draft of the study group report has been submitted to IAA Commission 4 in March 2016. The purpose of the present paper is to provide overview of the study group findings.
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摘要 :
The IAA study group 4.18, "Definition and Requirements of Small Satellites Seeking Low-Cost and Fast-Delivery", was initiated in 2014. Its objectives are to examine the definitions of small satellites, identify the requirements ev...
展开
The IAA study group 4.18, "Definition and Requirements of Small Satellites Seeking Low-Cost and Fast-Delivery", was initiated in 2014. Its objectives are to examine the definitions of small satellites, identify the requirements every satellite should follow regardless of its size or development philosophy and then reflect some of the findings to the ISO draft. After a series of meetings, the final draft of the study group report has been submitted to IAA Commission 4 in March 2016. The purpose of the present paper is to provide overview of the study group findings.
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摘要 :
Satellite constellations are of utmost importance nowadays, since Earth is 'inch-by-inch' spanned in terms of communication. Depending on factors such as intended recipients of the service or capability and communication type requ...
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Satellite constellations are of utmost importance nowadays, since Earth is 'inch-by-inch' spanned in terms of communication. Depending on factors such as intended recipients of the service or capability and communication type required, satellite constellation deployment requirement varies. Satellite coverage and the resulting ground tracks are calculated using the type of the selected orbit while assessing conditions for deployment of the satellite constellation. For communication satellites, different types of primary orbits include Molniya orbit, low (Polar and Non-Polar) Earth orbit, geostationary Earth orbit (GEO), and the other elliptical orbits. This research assesses the benefits of every distinct satellite orbit, its overall area of coverage, and the correlated effects on satellite communication networks.
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This paper briefly introduces the Kyushu Small Satellite Forum, established last September in the efforts
of the Council for the promotion of Aerospace Development in Kyushu. The primary objective of the
Kyushu Small Satellite F...
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This paper briefly introduces the Kyushu Small Satellite Forum, established last September in the efforts
of the Council for the promotion of Aerospace Development in Kyushu. The primary objective of the
Kyushu Small Satellite Forum is to support the development of small satellites made in Kyushu Island.
This paper also introduces three small satellite projects started in Kyushu Island: 1) QSAT the polar
plasma observation satellite, 2) KSAT the atmospheric water vapor observation satellite, and 3) HORYU
the space material exposure test and imaging satellite.
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Low earth orbit (LEO) satellite networks are capable of providing global or regional mobile services for a large number of users. Since the user's service duration may be greater than the coverage time of a LEO satellite, the user...
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Low earth orbit (LEO) satellite networks are capable of providing global or regional mobile services for a large number of users. Since the user's service duration may be greater than the coverage time of a LEO satellite, the user may be handed over to another visible satellite to prevent interruption of the ongoing communication. On the other hand, a mobile user may be covered by more than one satellite at the instant of connection handover. When the user is about to be handed over to another satellite, the serving satellite minimizing the number of handovers would in general be the one that provides the largest service time which is not necessarily equal to the coverage time of the very satellite. In this paper, we propose a new handover algorithm which exploits both the Global Positioning System (GPS) infrastructure and satellite diversity to provide a simple and real-time handover management in LEO satellite networks. The proposed algorithm not only minimizes the expected number of satellite handover, but is also efficient and easy to be implemented in hand-held devices, thus facilitating the mobile users' access to the satellite networks. Numerical simulations performed for two typical mobile satellite networks, viz. Iridium and Globalstar, corroborate the advantages gained by the proposed algorithm.
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摘要 :
Low earth orbit (LEO) satellite networks are capable of providing global or regional mobile services for a large number of users. Since the user's service duration may be greater than the coverage time of a LEO satellite, the user...
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Low earth orbit (LEO) satellite networks are capable of providing global or regional mobile services for a large number of users. Since the user's service duration may be greater than the coverage time of a LEO satellite, the user may be handed over to another visible satellite to prevent interruption of the ongoing communication. On the other hand, a mobile user may be covered by more than one satellite at the instant of connection handover. When the user is about to be handed over to another satellite, the serving satellite minimizing the number of handovers would in general be the one that provides the largest service time which is not necessarily equal to the coverage time of the very satellite. In this paper, we propose a new handover algorithm which exploits both the Global Positioning System (GPS) infrastructure and satellite diversity to provide a simple and real-time handover management in LEO satellite networks. The proposed algorithm not only minimizes the expected number of satellite handover, but is also efficient and easy to be implemented in hand-held devices, thus facilitating the mobile users' access to the satellite networks. Numerical simulations performed for two typical mobile satellite networks, viz. Iridium and Globalstar, corroborate the advantages gained by the proposed algorithm.
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The development characteristics of BeiDou satellite system have been analyzed based on the construction experiences of BeiDou Navigation Satellite regional System. The mission requirement, platform characteristics and payload tech...
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The development characteristics of BeiDou satellite system have been analyzed based on the construction experiences of BeiDou Navigation Satellite regional System. The mission requirement, platform characteristics and payload technology of BeiDou Navigation Satellite have been researched in this paper. The project propositions which are required to reinforce have been suggested for next BeiDou Navigation satellite system.
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摘要 :
The development characteristics of BeiDou satellite system have been analyzed based on the construction experiences of BeiDou Navigation Satellite regional System. The mission requirement, platform characteristics and payload tech...
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The development characteristics of BeiDou satellite system have been analyzed based on the construction experiences of BeiDou Navigation Satellite regional System. The mission requirement, platform characteristics and payload technology of BeiDou Navigation Satellite have been researched in this paper. The project propositions which are required to reinforce have been suggested for next BeiDou Navigation satellite system.
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The paper presents a satellite platform developed in Institute of Radioelectronics, Warsaw University of Technology, for present and future student pico-satellite missions. The platform consists of all systems necessary to proper ...
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The paper presents a satellite platform developed in Institute of Radioelectronics, Warsaw University of Technology, for present and future student pico-satellite missions. The platform consists of all systems necessary to proper operation of payload equipment that could be placed on the satellite: mechanical structure, power supply unit, communications and control system.
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摘要 :
The paper presents a satellite platform developed in Institute of Radioelectronics, Warsaw University of Technology, for present and future student pico-satellite missions. The platform consists of all systems necessary to proper ...
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The paper presents a satellite platform developed in Institute of Radioelectronics, Warsaw University of Technology, for present and future student pico-satellite missions. The platform consists of all systems necessary to proper operation of payload equipment that could be placed on the satellite: mechanical structure, power supply unit, communications and control system.
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