1corot science week, berlin, 10-12 december 2003 inside the corot machine overview of global loop...
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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 : laurent.kerjean@cnes.fr
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
3Corot Science Week, Berlin, 10-12 December 2003
Description of COROT SubsystemsDescription of COROT Subsystems::general drawinggeneral drawing
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
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
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)
!
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)
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
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)
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
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
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
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
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
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