A SpaceWire router architecture with non-blocking packet transfer mechanism

Yuasa, Takayuki; Takahashi, Tadayuki; Nomachi, M.; Hihara, Hiroki

doi:10.1109/spacewire.2014.6936261

Cited by 3 publications

(2 citation statements)

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“…Therefore, the R&D for spacecraft system architecture has advanced to conduct highly reliable design from the perspective of data handling and intercommunication among onboard equipment. [11] [12] Scientific satellites involve a wide variety of mission purposes, such as near-earth or deep space observations. Since different forms have to be adopted, depending on their missions, one of the most important perspectives is to make a data handling system scalable for the architecture that can be used commonly in small and large satellites, rather than the concept of a fixed common bus.…”

Section: System Architecture Of Astro-hmentioning

confidence: 99%

Contributing to the SpaceWire international standard

Hihara¹,

Nomachi

Takahashi

2019

Synthesiology English edition

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The X-ray astronomy satellite "ASTRO-H (Hitomi)" dramatically improved functions and performances required for satellite systems compared with conventional Japanese satellites. [2]-[5] Development of equipment onboard ASTRO-H was conducted under wide-ranging international cooperation. Therefore, development that ensured continuation of the conventional development as well as compliance to international standard was required. The SpaceWire international standard [6][7] employed for ASTRO-H was a de jure standard that the European Space Agency (ESA) oversaw. We were able to incorporate proprietary standards that were formed with Japanese scientific satellites over the years into the international standard. Looking back at the process by which Japanese proprietary standards were incorporated into the SpaceWire international standard and considering the success factors, it is possible to provide explanation based on the way of thinking presented in Reference [8]. The SpaceWire international standard was consolidated and established through discussions among the parties involved about the functions and performances to be realized, and its implementation method was set by specifying as international standards while technological development was conducted. This can be called a development-type standard. [9] In this article, we look back on the proposal activities based on the thoughts of Reference [8], and discuss the reproducible proposal process for the development-type international standard of which cases are increasing recently. Chapter 2 explains the route by which the system architecture of ASTRO-H, which is a compilation of SpaceWire standard products totally adopted for the first time, was recognized internationally. Chapter 3 summarizes the technological factors that allowed the Japanese proprietary technologies

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Section: System Architecture Of Astro-hmentioning

confidence: 99%

Contributing to the SpaceWire international standard

Hihara¹,

Nomachi

Takahashi

2019

Synthesiology English edition

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“…Almost all of onboard subsystems of ASTRO-H, such as the command/data handling system, the attitude control system, and four types of X-ray/gamma-ray telescope instruments, are connected to the SpaceWire network using a highly redundant topology. 11 The number of physical SpaceWire links between components exceeds 140 connecting ∼40 separated components (i.e., separated boxes), and there are more links in intracomponent (intra-board) networks. Most of the electronics boxes of both the spacecraft bus and the scientific instruments are mounted on the side panels of the space craft.…”

Section: Spacecraftmentioning

confidence: 99%

The ASTRO-H X-ray astronomy satellite

Takahashi¹,

Mitsuda²,

Kelley³

et al. 2014

SPIE Proceedings

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The joint JAXA/NASA ASTRO-H mission is the sixth in a series of highly successful X-ray missions developed by the Institute of Space and Astronautical Science (ISAS), with a planned launch in 2015. The ASTRO-H mission is equipped with a suite of sensitive instruments with the highest energy resolution ever achieved at E > 3 keV and a wide energy range spanning four decades in energy from soft X-rays to gamma-rays. The simultaneous broad band pass, coupled with the high spectral resolution of ∆E 7 eV of the micro-calorimeter, will enable a wide variety of important science themes to be pursued. ASTRO-H is expected to provide breakthrough results in scientific areas as diverse as the large-scale structure of the Universe and its evolution, the behavior of matter in the gravitational strong field regime, the physical conditions in sites of cosmic-ray acceleration, and the distribution of dark matter in galaxy clusters at different redshifts.

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