SKA low band everything but Jamaican music. Monica Alderighi Astrosiesta 19/01/2017

Transcription

1 SKA lw band everything but Jamaican music Mnica Alderighi Astrsiesta 19/01/2017

2 Square Kilmetre Array Led by the SKA Organisatin (SKAO), nt-fr-prfit UK cmpany (2011) INAF in the Funding Bard since the beginning 2

3 The SKA Telescpe 3 Telescpes (in phase 1) SKA-lw dual plarized lg peridic antennas 300 MHz bandwidth SKA-mid 192 dish antennas 5 GHz bandwidth SKA-survey 32 dish antennas, with PAF 500 MHz bandwidth SKA phase 2 (~ 2020) ~ 20x mre antennas 3

4 SKA Phase 1 Implementatin Suthern Africa Australia Cape Twn Blardy statin 250 Dishes including MeerKAT SKA-Mid 512 Statins (256 antennas each). Aperture Array Statins 90 Dishes including ASKAP SKA-Survey

5 SKA-lw Prpsed Layut 5

6 LFAA Data Flw LFAA is an all-electrnic telescpe, based n statinary antennas with advanced signal prcessing and cmputing capability Tile: 16 Antennas, 2 Pl, 32 Channels Statin: 16 Tiles, 256 Antennas 6

7 ADU Operatins Acquisitin f 32 analg inputs crrespnding t 16 duble plarizatin antennas Analg t Digital cnversin with sampling rate up t 1 GSPS Prcessing f acquired data, including channelizatin and beamfrming Receptin and transmissin f data t ther TPMs in the statin thrugh 40GbE links Frwarding f statin beam t CPF thrugh 40GbE links Cllecting and transmissin f data fr calibratin and mnitring purpses Lw cst and lw pwer mdular slutins shall be cnsidered mre than eight thusands bards fr SKA1 Existing hardware slutins fr backends, UNIBORD and CASPER, turned ut nt apprpriate AADC-TEL.LFAA.SE.MGT-AADC-PL-002, 2013 Faulkner, A. & Bij de Vaate, J. G., IEEE Int l Symp. n Phased Array System and Technlgy,

8 Feasibility study Main device: FPGA & ADC Xilinx Kintex UltraScale XCKU040 AD9680 Rack assembly Bard size & Pwer dissipatin Bard technlgy PCB build-up Islatin criteria Sampling clck architecture Preliminary Bard design 8

9 Tile Prcessing Mdule (TPM) TPM cnsists f tw units ADU bard Pre-ADU bard: ptical-electrical cnversin, filtering, amplificatin and equalizatin f analg signals manages 8 analg signals TPM is an assembly f 1 ADU and 2 Pre-ADU bards First release f the assembly fr the Aperture Array Verificatin System 1 (AAVS1) with the deplyment f 400 antennas at the Murchisn Radi-astrnmy Observatry in

10 Activity Breakdwn TPM Bard Develpment Management OACT/IASF HW + Basic Firmware IASF/Sanitas EG Operatin Firmware Arcetri/Sanitas EG/ Oxfrd/RAL Test Bench IASF/Sanitas EG Sftware Malta Univ/Oxfrd Perfrmance Test IRA Mechanical Design IRA/Sanitas EG 10

11 Crss-talk analysis Signal generatr n each input, ne at a time Off line FFT calculatin n digitized sampled data Highest values in inputs #3, #5 and #6, very likely caused by the prximity f the traces in the PCB layut -60 Bard1 (ADA) --- Crss-Talks Input 4 with signal in ther inputs -60 Bard 2 (NO ADA) --- Crss-Talks Input 4 with signal in ther inputs Pwer [dbc] Signal In0-100 Signal In1 Signal In2 Signal In3 Signal In5 Signal In6 Signal In7 Signal In8-120 Signal In9 Signal In10 Signal In11 Signal In12 Signal In13 Signal In14 Signal In Frequency [MHz] Pwer [dbc] -100 Signal In0 Signal In1 Signal In2 Signal In3 Signal In5 Signal In6 Signal In7-120 Signal In8 Signal In9 Signal In10 Signal In11 Signal In13 Signal In14 Signal In Frequency [MHz] 11

12 Digital signal quality Signal generatr nt a given channel thrugh RFJIG The signal is acquired, digitized and stred in FPGA memry The signal is sent t the test PC via Ethernet link fr ff line analysis 12

13 Perfrmed activities Feasibility Study: January 2014 Prttype prductin R 1.0, 1 R.1, R 1.2 Perfrmance Tests Data acquisitin, cnfiguratins Pwer cnsumptin and temperature in rack Public Tender fr AAVS1, 25 ADU bards Published April 18, 2016 ADU Testing Test Specificatin Test Firmware Prcedures fr ADU bard functinal verificatin Test JIG develpment 13

14 Future activities Deplyment f 400 LFAA antennas at the Murchisn Radiastrnmy Observatry ADU Upgrade R 2.0 prttype featuring lw pwer ADCs High density rack capability Feasibility study fr LFAA sub-racks with several TPM bards (#12) Design and implementatin Sub-rack Sub-rack management bard Back plane bard fr sub-rack 14

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