SPACE APPLICATIONS FOR SOLID STATE
Transcription
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 1 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 2 Tous droits réservés © Alcatel Space Industries All rights Nom Fichier - 18/09/2001 - 2 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. 3 Tous droits réservés © Alcatel Space Industries All rights Nom Fichier - 18/09/2001 - 3 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. 4 Tous droits réservés © Alcatel Space Industries All rights Nom Fichier - 18/09/2001 - 4 GENERAL FUNCTIONAL BLOCK DIAGRAM Input channel JPEG Compression Memory stack Control unit CCSDS Formating Down link subsystem Classic Image Data handling sub-system 5 Tous droits réservés © Alcatel Space Industries All rights Nom Fichier - 18/09/2001 - 5 GENERAL FUNCTIONAL BLOCK DIAGRAM Memory stack Data Off line processing Input channel Formatting Control unit Down link subsystem 6 Tous droits réservés © Alcatel Space Industries All rights Nom Fichier - 18/09/2001 - 6 GENERAL FUNCTIONAL BLOCK DIAGRAM Memory stack 1 Input channel Off line Processing Data acquisition Down link subsystem Memory stack 2 Output Processing Control unit 7 Tous droits réservés © Alcatel Space Industries All rights Nom Fichier - 18/09/2001 - 7 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 8 Tous droits réservés © Alcatel Space Industries All rights Nom Fichier - 18/09/2001 - 8 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). 9 Tous droits réservés © Alcatel Space Industries All rights Nom Fichier - 18/09/2001 - 9