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PLATO Main Electronics Units (MEU) based on inputs from P. Plasson and the system team

PLATO Main Electronics Units (MEU) based on inputs from P. Plasson and the system team. J. Miguel Mas-Hesse Centro de Astrobiología (CSIC-INTA). On-board data processing: Introduction.

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PLATO Main Electronics Units (MEU) based on inputs from P. Plasson and the system team

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  1. PLATO Main Electronics Units (MEU)based on inputs from P. Plasson and the system team J. Miguel Mas-Hesse Centro de Astrobiología (CSIC-INTA)

  2. On-board data processing: Introduction • DPS goal: automaticallyprocess and extractaccuratestellar light curves fromtheraw, messyCCD images. Stellar field PLATO image J. Miguel Mas-Hesse

  3. On-board data processing: baseline concept • The normal-telescopes onboard data processing system will be formed by: • 4 CCD + 1 FEE per focal plane (telescope) • 32 telescopes • 1 Data Processing Unit (DPU) per 2 focal planes • 16 DPU boards • 4 DPUs per 1 Main Electronics Unit (MEU) • 4 MEU boxes • 1 Instrument Control Unit (ICU) per 4 MEUs • 1 ICU (+ 1 fully redundant ICU) J. Miguel Mas-Hesse

  4. On-board data processing: architecture 1 N-DPU for 2 N-cameras F-cameras J. Miguel Mas-Hesse

  5. On-board data processing: architecture Present MEU baseline concept: + 1 DPU per 2 focal planes+ 1 single DPU PSU box, external to the MEU’s SpW To ICU-M To ICU-R J. Miguel Mas-Hesse

  6. SpW 100 Mbps PLATO MEU: FEE – DPU SpW link • FEE – DPU link baseline: • 2 SpaceWire links per FEE (100 Mbps) • Alternative: • 1 SpaceWire link per FEE (200 Mbps) • Feasibility has to be demonstrated. J. Miguel Mas-Hesse

  7. On-board data processing: architecture J. Miguel Mas-Hesse

  8. On-board data processing: architecture J. Miguel Mas-Hesse

  9. PLATO MEU: operation • Target count for 2 x 4 CCD per DPU (to be processed every 25 sec.): Nominal sample 2x(110.000 stars/telescope) = 220.000 stars/DPU Extended sample (+50% margin) = 330.000 stars/DPU Background win. 2 x 400 Imagettes up to 2 x 2.000 Offset windows 2 x 2 x 4 half-row (2.255 pixels) Smearing rows 2 x 4 x 10 overscan rows • Total memoryrequirement, including 50% marginonstarcount: 250 Mbytes per DPU 6.25 sec Fullimage Acquisition x 8 2 images / 6.25 sec 6.25 sec Window Extraction up to 330.000 stars / 25 sec 6.25 sec Data correction and LC extraction 5400 sec Masks & window positions updating J. Miguel Mas-Hesse

  10. PLATO MEU: CPU load • The CPU load has been estimated for various processors, based on current baseline for number of stars + extraction algorithms. At this phase the %CPU load should be ≤ 50%. • The present concept seems feasible, but: • with 1 DPU/2 telescopes, no margin on star counts acceptable. • with 1 DPU/telescope an extended sample with +50% margin in star counts could be considered, if required. . Weighted mask photometry assumed J. Miguel Mas-Hesse

  11. PLATO MEU: open points Backup concept: + 1 DPU board per telescope + 4 DPUs per MEU + 8 MEU More powerful, but too heavy J. Miguel Mas-Hesse

  12. PLATO MEU: open points J. Miguel Mas-Hesse

  13. PLATO: next steps • The industrial MEU definition study is starting now. • Goals: • Definition and dimensioning of the N-DPUs • Global architecture, choice of processors, number of SpaceWire data links, location of PSUs, mass, power comsumption,… • Trade off on algorithms potential increase of complexity • Development of simulators/breadboards for critical interfaces • Spacewire link FEE – DPU Final design within mass and power budgets, but compliant with scientific requirements! J. Miguel Mas-Hesse

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