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AAVS1/2-low demonstrators

AAVS1/2-low demonstrators. Jan Geralt Bij de Vaate. SKA 1 : AA-low station. Cooling. 2-Pol Elements. . Element Digitisation. Copper. Fibre. Station Processing RFI shielded. Element Digitisation RFI Shielded. Tile Digitisation. Station Beams. Tile Digitisation. . Element Data.

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AAVS1/2-low demonstrators

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  1. AAVS1/2-low demonstrators Jan Geralt Bij de Vaate

  2. SKA1: AA-low station Cooling 2-Pol Elements ... Element Digitisation Copper Fibre Station Processing RFI shielded Element Digitisation RFI Shielded Tile Digitisation Station Beams Tile Digitisation ... Element Data ...... Control & Monitoring ... ...... C & M System clock ...... Clock ... To Correlator & Services 2x 500MHz Analogue + power Element Digitisation Front-end ... Each station: Diameter: 180m # of elements: 11,300 Element links: Copper Power Distribution Power Grid

  3. Proposed specification • From draft SKA phase 1 system description, June 2010 DRAFT

  4. After the 50MHz issue.. • And LOFAR / MWA /.. • AAVS-low needs to address • Broadband Aeff / Tsys (antenna, lna, beamforming) • Broadband receiver • Cost effective signal processing • Calibration • Monitoring & Control • Some specs need new developments • Some (just) need proper choices • Note: one array for 50-450MHz not possible

  5. AA-low antenna design • Addressed by • UCAM • INAF / IEIIT-CNR • ICRAR • ASTRON (2011) • ~10 full scale antenna prototypes build 2011 • Action • Agree on test approach/range • Extend analyses for scan angle and frequency Razavi 2010 Wijnholds 2010

  6. AA-low station • Addressed by • UCAM • UMAN • 2011..ICRAR, ASTRON • Many options • Action • Form (small) focussed team • AAVP, SPDO domain spec and scientist , ‘AA’ astronomer Bregman 2010

  7. Sometrade offs -LOFAR, MWA, AAVP will need to confirm/complete the trade-offs -More: Filling factor, uv coverage, calibration, FoV etc..

  8. AA-low LNA • Addressed by • INAF • ICRAR • UMAN • Should not be an issue but • Coupling • Impedance, 50, 150, 300 Ohm • Differential LOFAR simulation, Kant

  9. AA-lowreceiver • 6, 8 or 12 bits needed • 8 fine? • SPDO: please release new RFI data! • RFI at 55MHz (not in this plot) • Levels?? • 50-70MHz does not come for free • Action • Requirements analyses: ASTRON+SPDO CoDR docs

  10. AA-low costing • Analogies costing • LOFAR • MWA • AA station model input by AAVP PE and AA domain specialist

  11. AAVS rationale • Prototyping essential • LOFAR initial test station and CS1, MWA 32T • Antenna array needs adequate receivers and back-end • Test software • Common test platform needed! • For AA-low options & AA-mid • Site: Sufficient low RFI, fibre link, power, • Signal processing (limited bandwidth?) • Action • Define requirements test platform

  12. AAVS1: AA-low • Demonstrate electromagnetic and front end performance • Sufficient collecting area (250-500m2?), possibly two versions • Focus onbroadband antenna and front-end design • Evaluation usingexisting processing • UNIBOARD, ROACH or LOFAR / MWA • Goal: establish antenna, tile and station configuration • Extensive station simulationsrequired • Critical Design Review 31-12-2011 • Commissioning 31-12-2012 • Reporting 30-6-2013

  13. AAVS1: AA-low • Actions • Specify AAVS1 • Based on SKA1 System Requirement Specification • Hardware costs / resources AAVP DoW March 2010, to be updated

  14. AAVS2: AA-low • Pre production phase: • Preparing for mass-production, design for manufacturing • AAVS2 prototype • Test tooled production components • SKA1 performance compliance • Bandwidth, Tsys, stability, signal processing, calibratability, climate • Critical Design Review 30-9-2013 • Construction 2014 • Comisioning 2015 • Reporting for SKA1 PR 31-12-2015

  15. AAVS2 requirements • In order to ramp-up production in 2016, AAVS2 should besufficientlylarge: e.g. 1-2% SKA1(~10.000 elements) • Built with SKA1 tooling • A couple of ‘d’ diameter stationsincluding digital station beamforming • Note: e.g. ifused UNIBOARD 2 needs to productionreadyby 2014 • On the SKA site • Acceptance tests of this station shouldbeconsidered in absence of correlator • Schedule is tight: custom MMICs, photonic links, signal processing boards

  16. AA-low • Montly telecons • Wiki for progress docs, minutes etc. • www.ska-aavp.eu/aavpwiki • Workpackages • System design • Antenna element, array • Front-end (LNA, receiver, data link) • Calibration & beamforming • Proto type, Design, Construction & commisioning, Evaluation

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