SPACE APPLICATIONS FOR SOLID STATE

SPACE APPLICATIONS
FOR SOLID STATE RECORDER AND DATA PROCESSING
Alcatel Space Industries
26 Avenue JF Champollion
BP 1187
31037 TOULOUSE Cedex 1
FRANCE
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GENERAL SURVEY
GLOBAL TRENDS
tEmergence of data storage capabilities in most of the Payload
data handling units
tThis unit fulfills increasing payload data processing
(compression, formatting …), data rate, memory capacity
tMCV Budget allowances does not follow the performance
increase.
tPlanning and cost target implies the development of standard
building blocks
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tTo answer to this problematic, ASPI as developed an
architecture for such subsystem around a SSR which includes
various on board processing.
tThe Memory stack chorus answers to the highest
performances in terms of access data rate and storage
performances.
tThis chorus includes the storage capacity, the access function
(read and write) and the file management software.
tAround this chorus, we can implement function for on board
data processing such as image compression, data ciphering
and formatting.
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On board Processing
tDirect processing
q Data are processed at the input data rate and store in the SSR
(typical architecture for Imaging subsystem)
t“Off Line” Processing
q Data are store in the stack at the input data rate
q This data are taken from the solid state recorder, processed
and the result is write back in the SSR for future download to
ground.
q Processing can be done either by hardware or software.
tOutput Processing
q The data are taken out from the stack, processed (ciphering,
CCSDS formatting) and then send to the Payload Telemetry
Subsystem.
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GENERAL FUNCTIONAL BLOCK DIAGRAM
Input channel
JPEG
Compression
Memory
stack
Control
unit
CCSDS
Formating
Down link
subsystem
Classic Image Data handling sub-system
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GENERAL FUNCTIONAL BLOCK DIAGRAM
Memory
stack
Data Off line
processing
Input channel
Formatting
Control
unit
Down link
subsystem
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GENERAL FUNCTIONAL BLOCK DIAGRAM
Memory
stack 1
Input channel
Off line
Processing
Data
acquisition
Down link
subsystem
Memory
stack 2
Output Processing
Control
unit
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Performances (1/2)
Performances
t For an equipment with
q 8 Concurrent JPEG
compression chain
processing 200 Mbits/sec
per chain
q 128 Gbits of memory
t MCV Performances are
q Volume : 250*290*400
mm3
q Mass : Less than 18 Kg
q Typical Power about
100W
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Conclusion
tThis architecture seems to give good answers to various
application.
tWe find some restrictions to the “building block” strategy on
the following points :
q Electrical input and output interfaces (hotlinks, space wire, //
LVDS buses, …)
q Compression output format (CCSDS CP_PDU or proprietary
format).
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