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Inside the COROT machine

Inside the COROT machine. Overview of global loop for COROT operations Description of COROT Subsystems The way COROT works The way Ground commands COROT Three main products Commanding COROT mode. L. KERJEAN CNES DSO/ED/TU/CO e-mail : laurent.kerjean@cnes.fr.

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Inside the COROT machine

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  1. Inside the COROT machine • Overview of global loop for COROT operations • Description of COROT Subsystems • The way COROT works • The way Ground commands COROT • Three main products • Commanding COROT mode L. KERJEAN CNES DSO/ED/TU/CO e-mail : laurent.kerjean@cnes.fr

  2. Overview of global loopfor COROT operations

  3. Description of COROT Subsystems:general drawing

  4. Description of COROT Subsystems:CCD • One CCD for Astero channel and one for Exo channel (2 other CCDs for 2nd chain) • Image zone 2048x2048 pixels • Memory zone idem + 4 lines for overscan • One output register • Split in two parts, right and left • Each 1/2 register contains 50 elements of pre-scan • Binning available • CCD reading every 1s or 32 s for Astero CCD • Reading every 32s for Exo CCD CCD drawing Super Pixel

  5. Description of COROT Subsystems:Electronic Control Camera (ECC) • BCV CAM • Electrical power for EP and BCC • EP A and EP E (Proximity Electronics for Astero and Exo, Electroniques de Proximité ) • Interface between CCD and BCC • Preamplication for right and left video channel signals • BCC (Camera Control Box, Boitier Contrôle Caméra) • Digitalisation of video signals from EP • Management of sequences for Astero channel • Interface with PROTEUS OBDH (On Board Data Handling) for 16 bits command words and parameters

  6. Description of COROT Subsystems:Numerical Assembly (ETN : Ensemble de Traitement Numérique) • BCV ETN • Electrical power for BEX and DPU • BEX • Receives signals from BCC • Identifies useful pixels and stores in associated windows, reverse order of right half CCD • Communication with DPU via 1355 links for data and command/control, BEX acting as slave • DPU • Communication with BEX via 1355 links for data and command/control, DPU acting as master • Communication with PROTEUS platform for data and command/control via 1553 bus, DPU acting as a Remote Terminal • Delivers pointing data for PROTEUS AOCS (Attitude & Orbit Control System) • Scientific computation for Exo and Astero channels All commands and parameters to/from BEX go thru DPU(NO direct acces to BEX from ground)

  7. The way COROT works:BCC

  8. The way COROT works:Extractor (BEX)

  9. The way COROT works :DPU

  10. The way Ground commands COROT • Ground to PROTEUS platform • CCSDS commands for complete satellite, including COROT instrument ones • PROTEUS to COROT instrument • Immediate commands • OBDH commands for BCC and BS2 (platform data bus) • 1553 commands for DPU and BEX • Time Tagged commands • Waits for due date • Sends commands as done for Immediate ones • DPU to ETN • For DPU : configuration of processings, activation/desactivation of services • For BEX • Command/Control : reset, upload/dump of code, observability • Look Up Tables management • Mode Management

  11. Three main products • Full images (Exo and Astero) • Definition • Full image of extended CCD (2054 rows x 2160 columns) • Volume (for one CCD image) • 109 Mbits, 11.5 mn for storage in PROTEUS Mass Memory, 3.5 mn to download to Ground • 10 images/day for sequential acquisition of Full images of Exo or Astero for both chains • Windows • Definition • Subset of CCD, square for Astero, shape defined by 256 templates for Exo • Volume • Astero (per chain) : 5 stars, 5 Background, 2.4 Mbits • Exo (per chain) : 6000 images of 150 pixels max, 40 Mbits, 4.5 mn for storage in PROTEUS Mass Memory, 1.3 mn to download to Ground

  12. Three main products (continued) • Photometric products • Definition • Astero : Points of light curves for 5 stars, 5 Background, 2 Offset, Images for 2 stars • Exo : Points of light curves for 5000 chromatic stars max, 948 monochromatic stars max, x oversampled chromatic stars (among 5000), y oversampled monochromatic stars (among 948), oversampled stars max 500, 20 "imagettes" (image of exo windows) max 20 and 32 offset windows • Volume (per chain) • Astero : 5 stars, 5 Background, 2 Offset/CCD, fine pointing data : 250 Mbits/day • Exo : 222 Mbits/day

  13. Commanding COROT mode :Policy • Modes defined w.r.t type of data • Full image, windows, points of light curves • Step by step operations (from more simple to more complex) • Ground commands to enter in a mode • Acquisition of data on board • Reception at ground level • Analysis by scientists (may lasts several hours or days) • Update of parameters for next step

  14. Commanding COROT mode :Mode chart

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