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1 Corot Science Week, Berlin, 10-12 December 2003 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 : [email protected]

1Corot Science Week, Berlin, 10-12 December 2003 Inside the COROT machine Overview of global loop for COROT operations Description of COROT Subsystems

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Page 1: 1Corot Science Week, Berlin, 10-12 December 2003 Inside the COROT machine Overview of global loop for COROT operations Description of COROT Subsystems

1Corot Science Week, Berlin, 10-12 December 2003

Inside the COROT machineInside 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

CNESDSO/ED/TU/CO

e-mail : [email protected]

Page 2: 1Corot Science Week, Berlin, 10-12 December 2003 Inside the COROT machine Overview of global loop for COROT operations Description of COROT Subsystems

2Corot Science Week, Berlin, 10-12 December 2003

Overview of global loopOverview of global loopfor COROT operationsfor COROT operations

COROT Mission CenterPROTEUSCommand&Control CenterCOROT Data CenterGround Stations COROT SatellitePROTEUS

platformCOROT payload

Chain 1Chain2CommandsTM packets+acq,TCHousekeeping TM

+Payload TM

TCHousekeeping TM

Payload TMRequests for programmationPayload command

filesScience level 1

products

Page 3: 1Corot Science Week, Berlin, 10-12 December 2003 Inside the COROT machine Overview of global loop for COROT operations Description of COROT Subsystems

3Corot Science Week, Berlin, 10-12 December 2003

Description of COROT SubsystemsDescription of COROT Subsystems::general drawinggeneral drawing

Page 4: 1Corot Science Week, Berlin, 10-12 December 2003 Inside the COROT machine Overview of global loop for COROT operations Description of COROT Subsystems

4Corot Science Week, Berlin, 10-12 December 2003

Description of COROT SubsystemsDescription of COROT Subsystems::CCDCCD

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

Page 5: 1Corot Science Week, Berlin, 10-12 December 2003 Inside the COROT machine Overview of global loop for COROT operations Description of COROT Subsystems

5Corot Science Week, Berlin, 10-12 December 2003

Description of COROT SubsystemsDescription of COROT Subsystems::Electronic Control Camera (ECC)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

Page 6: 1Corot Science Week, Berlin, 10-12 December 2003 Inside the COROT machine Overview of global loop for COROT operations Description of COROT Subsystems

6Corot Science Week, Berlin, 10-12 December 2003

Description of COROT SubsystemsDescription of COROT Subsystems::Numerical Assembly Numerical Assembly (ETN : Ensemble de Traitement Numérique)(ETN : Ensemble de Traitement Numérique)

BCV ETNElectrical power for BEX and DPU

BEXReceives signals from BCC Identifies useful pixels and stores in associated

windows, reverse order of right half CCDCommunication 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)

!

Page 7: 1Corot Science Week, Berlin, 10-12 December 2003 Inside the COROT machine Overview of global loop for COROT operations Description of COROT Subsystems

7Corot Science Week, Berlin, 10-12 December 2003

The way COROT worksThe way COROT works::BCCBCC

EP ARLBCCExoAsteroRLRLRLRStar Window Integrated Programmer

(Includes description of Astero windows)

EP ERLCCDEXO

RLCCDAstero

RL(SDATA+SCLCK)(SDATA+SCLCK)(SDATA+SCLCK)(SDATA+SCLCK)

LAlways Full CCD ImageFull CCD Image or

Windows (large or small)

Page 8: 1Corot Science Week, Berlin, 10-12 December 2003 Inside the COROT machine Overview of global loop for COROT operations Description of COROT Subsystems

8Corot Science Week, Berlin, 10-12 December 2003

The way COROT worksThe way COROT works::Extractor (BEX)Extractor (BEX)

Full CCD IMAGEor

Windows(large or small)

(SDATA+SCLCK)(SDATA+SCLCK)(SDATA+SCLCK)(SDATA+SCLCK)

BEXEXOAsteroLUT (description of EXO windows

to extract)

LUT (description of

Astero windows to identify)

Full CCD Image{{

AsteroWindow

Left

AsteroWindow

Right...}up to 12 windows

AsteroWindow

Left

AsteroWindow

Right

EXOWindow

Left

EXOWindow

Right...}up to 6000 windows

EXOWindow

Left

EXOWindow

Right

RLRL

Page 9: 1Corot Science Week, Berlin, 10-12 December 2003 Inside the COROT machine Overview of global loop for COROT operations Description of COROT Subsystems

9Corot Science Week, Berlin, 10-12 December 2003

The way COROT works The way COROT works ::DPUDPU

DPUEXOAsterodescription of EXO windows description of

Astero windows { { up to 12 windows

AsteroWindow

Left

AsteroWindow

Right...AsteroWindow

Left

AsteroWindow

Right

up to 6000 windows

EXOWindow

Left

EXOWindow

Right...EXOWindow

Left

EXOWindow

Right

description of Astero software

processings

description of EXO software processings

Authorize/Inhibit Exo processing

(protons impacts)

Astero productsEXO productsFine Pointing Data (for AOCS)

Page 10: 1Corot Science Week, Berlin, 10-12 December 2003 Inside the COROT machine Overview of global loop for COROT operations Description of COROT Subsystems

10Corot Science Week, Berlin, 10-12 December 2003

The way Ground commands COROTThe way Ground commands COROT

1) Ground to PROTEUS platform CCSDS commands for complete satellite, including COROT

instrument ones

2) 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

3) 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

Page 11: 1Corot Science Week, Berlin, 10-12 December 2003 Inside the COROT machine Overview of global loop for COROT operations Description of COROT Subsystems

11Corot Science Week, Berlin, 10-12 December 2003

Three main products 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 MbitsExo (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

Page 12: 1Corot Science Week, Berlin, 10-12 December 2003 Inside the COROT machine Overview of global loop for COROT operations Description of COROT Subsystems

12Corot Science Week, Berlin, 10-12 December 2003

Three main products (continued)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/dayExo : 222 Mbits/day

Page 13: 1Corot Science Week, Berlin, 10-12 December 2003 Inside the COROT machine Overview of global loop for COROT operations Description of COROT Subsystems

13Corot Science Week, Berlin, 10-12 December 2003

Commanding COROT mode :Commanding COROT mode :PolicyPolicy

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)1) Ground commands to enter in a mode

2) Acquisition of data on board

3) Reception at ground level

4) Analysis by scientists (may lasts several hours or days)

5) Update of parameters for next step

Page 14: 1Corot Science Week, Berlin, 10-12 December 2003 Inside the COROT machine Overview of global loop for COROT operations Description of COROT Subsystems

14Corot Science Week, Berlin, 10-12 December 2003

Positionning Phase

ObservationPhase

Commanding COROT mode :Commanding COROT mode :Mode chartMode chart

Transition on TCTransition on TC with automatic return

1Order number in nominal sequence

Automatic transition on anomaly

Transition on bus configuration change

OFFSAFEVeille(Stand By)

VEG(Rough Pointing)

2 VEF(Fine Pointing)

31 VIA(Astero Full Image)

4 VIE(EXO Full Image)

5 VPM(Exo Mask Validation)

6ObservationPeriodic Calibration