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SpaceWire Driven Architecture
for the ASTRO-H Satellite
Masanobu Ozaki (ISAS/JAXA),
T. Takahashi, M. Kokubun, T. Takashima, H. Odaka
(ISAS/JAXA), M. Nomachi (Osaka Univ.), T. Yuasa (UTokyo), I. Fujishiro (SHIMAFUJI), T. Tohma (NEC), H.
Hihara (NEC-Toshiba space), K. Masukawa (MHI)
ASTRO-H
• Japanese 6th X-ray astronomy
space observatory
• 2014 launch (scheduled)
• Multi-country mission
(Japan, US, Nederland,
Canada, France, ...)
2010-06-22/23/24, ISC2010
SpW driven architecture for the ASTRO-H
satellite (M. Ozaki)
2
ASTRO-H (2)
• Multiple and distributed
payloads
• Low budget, short term
construction
-> a new standard of
– network protocol
– Router
– Standard computer
architecture
– Standard I/O module with
SpW
2010-06-22/23/24, ISC2010
Star trackers
SXS
Extensible
Optical
Bench
SpW driven architecture for the ASTRO-H
satellite (M. Ozaki)
SXI
L = 14 m
HXI
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Architecture Requirements
• Data rate: 12 Gb/day (140 kbps) at satellite
output
• Communication among instruments are 10100 times faster than that, however.
-> Reliable network topology is a key.
2010-06-22/23/24, ISC2010
SpW driven architecture for the ASTRO-H
satellite (M. Ozaki)
4
Network Topology (physical)
• Twin star-topology networks
– No packet collision between channels
Data Handling network
Telemetry
Command
Interface
Module
TCIM
(No Time Packet
Propagation)
X
SpW
router
SpW
router
SMU
Satellite
Management
Unit
AOCP
2010-06-22/23/24, ISC2010
SpW
router
Attitude and
Orbit
Control
Processor
SpW
router
HXI-DE
Attitude Control network
DR
SXS-DE
SpW driven architecture for the ASTRO-H
satellite (M. Ozaki)
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Network Topology (logical)
• Tree-topology network
– Communications are limited between the parent
and each child nodes.
DR
Telemetry
Command
Interface
Module
TCIM
(Ground Stations)
AOCP
Attitude and
Orbit
Control
Processor
SMU
Satellite
Management
Unit
SXS-DE
HXI-DE
2010-06-22/23/24, ISC2010
SpW driven architecture for the ASTRO-H
satellite (M. Ozaki)
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Protocols
• Everything is on RMAP
– CCSDS space packets on RMAP space
– PIM (Peripheral Interface Module: ISAS traditional
communication I/F) protocol on RMAP/SpW
– Time slot bases: SMU controls everything
• SMU sends out space packet commands to payloads
• SMU collects space packet telemetry or raw data from
payloads
– DR delegates SMU in case of space packet telemetry
2010-06-22/23/24, ISC2010
SpW driven architecture for the ASTRO-H
satellite (M. Ozaki)
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Components: SpaceCube
• Computer architecture with SpW I/F
– open architecture based on T-Engine
– SpW connection
– source-code level compatibility in the application
layer between different implementation
– small, low mass, low power consumption and low
cost
• Developed by SHIMAFUJI (commercial base),
NEC and MHI (flight models)
2010-06-22/23/24, ISC2010
SpW driven architecture for the ASTRO-H
satellite (M. Ozaki)
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Components: peripherals
• Embedded RMAP devices
– I/F ASIC by NEC
– Standard I/O boards with FPGAs by MHI
• Usable as memory or memory-mapped I/O
devices on SpW network without CPU
2010-06-22/23/24, ISC2010
SpW driven architecture for the ASTRO-H
satellite (M. Ozaki)
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Development Supports
• GSE
– SMU simulators using SHIMAFUJI SpaceCube
(by NEC)
– SpW <-> TCP/IP bridges (by T. Yuasa)
– SpW test lab. supported by the community
(at SHIMAFUJI office)
2010-06-22/23/24, ISC2010
SpW driven architecture for the ASTRO-H
satellite (M. Ozaki)
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Development Supports (2)
• Community
– Front runners in
universities and
companies help the
followers regular basis.
– Mainly by email/IT
based supports,
sometimes by training
courses.
2010-06-22/23/24, ISC2010
SpW driven architecture for the ASTRO-H
satellite (M. Ozaki)
11
Conclusion
• ASTRO-H is a SpW-based space observatory.
• The network topologies are configured to
keep the throughputs as fast as possible with
limited link speed.
• Standardization of components reduces the
development costs and period.
• Development supports by the project and user
community are important keys.
2010-06-22/23/24, ISC2010
SpW driven architecture for the ASTRO-H
satellite (M. Ozaki)
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