SKA Low Correlator & Beamformer - Towards Construction
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1 SKA Low Correlator & Beamformer - Towards Construction Dr. Grant Hampson 15 th February 2018 ASTRONOMY AND SPACE SCIENCE
2 Presentation Outline Context + Specifications Development team CDR Status + timeline Solution - FPGA + code + SW Model verification Low.CBF ITF + emulators Transition to construction 2 SKA Low Correlator & Beamformer - Towards Construction C4SKA - Feb 18 Dr. Grant Hampson
3 SKA Low Challenges 512 stations each with 256 dual-pol log periodic antennas MHz sky frequency 300MHz processed BW Real time commensal processing Correlator and 2 Pulsar Beamformers 3 SKA Low Correlator & Beamformer - Towards Construction C4SKA - Feb 18 Dr. Grant Hampson
4 Processing Terminology LFAA forms multiple beams local to each station (total bandwidth 300MHz) Stations may also need an Array Covariance Matrix (or Station Correlator) Imaging Correlator Calculates auto and cross correlations between common station beams for all stations in the subarray Cross beam correlations may reveal RFI Pulsar/VLBI Beamformers Combines common station beams for all stations into a tied array beam There can be many tied array beams within a station beam 4 SKA Low Correlator & Beamformer - Towards Construction C4SKA - Feb 18 Dr. Grant Hampson
5 Low.CBF Science Specs Up to 16 subarrays 512 stations or 2048 substations Up to 8 station beams 300MHz per station (75 or 18.75MHz per substation) Standard Correlator resolution (5.4kHz 55k channels) Correlator Zooms (0.2-14kHz 4x16k channels) 500 Pulsar Search Beams with 118MHz (14.5kHz) 16 Timing Beams with 300MHz (3.6kHz) (up to 4 can be allocated to VLBI Beams) RFI excision (fixed and dynamic) at output frequency resolution 5 SKA Low Correlator & Beamformer - Towards Construction C4SKA - Feb 18 Dr. Grant Hampson
6 International Collaboration SKA cannot be built without collaboration Low.CBF formed 2 years ago as part of Central Signal Processing (CSP) Common expertise, 1+1>2 6 SKA Low Correlator & Beamformer - Towards Construction C4SKA - Feb 18 Dr. Grant Hampson
7 Low.CBF Timeline Perentie collaboration Preliminary Design Review Critical Design Reviews Early Production Array (EPA) SKA Construction starts SKA Phase 1 completes Winding path, but end worth it! 7 SKA Low Correlator & Beamformer - Towards Construction C4SKA - Feb 18 Dr. Grant Hampson
8 Critical Design Review (CDR) Submitted subelement CDR documentation 26th January pages of primary documents - waiting on reviewer/ska comments Face-to-face subelement review is 5-9 March 2018 at SKAO CSP element level review delayed Submit 30 June, review Sep 8 SKA Low Correlator & Beamformer - Towards Construction C4SKA - Feb 18 Dr. Grant Hampson
9 Low.CBF Structure Models, subsystems and ICD s define the overall system structure 9 SKA Low Correlator & Beamformer - Towards Construction C4SKA - Feb 18 Dr. Grant Hampson
10 Data Model Software interface critical - supports all the modes Describes instrument capabilities Subarray independence Interfaces: Tango based LMC User interfaces 10 SKA Low Correlator & Beamformer - Towards Construction C4SKA - Feb 18 Dr. Grant Hampson
11 Signal Processing Model Proves the validity of the chosen signal processing algorithms Generation of simulated sky signals received by stations Allows for Quantisation and quick sizing/performance tradeoffs Verification in development FPGA Code development Emulator verification system Blue - 8-bit correlator alone Red - inclusive of all quantised signal processing 11 SKA Low Correlator & Beamformer - Towards Construction C4SKA - Feb 18 Dr. Grant Hampson
12 Gemini FPGA LRU Liquid cooled, full optical interconnect, 12 LRU s per Subrack 4 Tera-multiply-accumulates, 1.3 Tera-bits-per-second comms, 16GB DDR4 memory 12 SKA Low Correlator & Beamformer - Towards Construction C4SKA - Feb 18 Dr. Grant Hampson
13 Future FPGAs FPGAs will increase in size, speed, features and decrease in power Also, will see RF entering FPGA receiver on an FPGA 13 SKA Low Correlator & Beamformer - Towards Construction C4SKA - Feb 18 Dr. Grant Hampson
14 Transformational FPGA Technologies Highly interconnected processing nodes Low latency/predictable interconnects Huge amount of input/output bandwidth High density parallel compute Liquid cooling to the chip level Lower cost per peta-operations-per-second High level design flows to reduce effort Increasing memory options (sizes and bandwidth) High memory bandwidth not compute limited 14 SKA Low Correlator & Beamformer - Towards Construction C4SKA - Feb 18 Dr. Grant Hampson
15 FPGA Code Monitoring and Control custom protocol and interface RadioHDL FPGA vendor independent coding style Signal Processing, Memory and Data Communications Station Based Processing Array Based Processing LFAA Station Statistics Doppler Shift Coarse Delay Correlator Filterbank Fine Delay RFI Flagging Correlator and Time Integration Output Frequency Accumulator SDP Pulsar Search Filterbank Fine Delay RFI Flagging Station Polarisation Correction PSS Beamformer Beam Polarisation Correction Low.PST Pulsar Timing Filterbank Fine Delay RFI Flagging Station/Beam Polarisation Correction PST Beamformer Low.PSS VLBI Formatter Low.VLBI 15 SKA Low Correlator & Beamformer - Towards Construction C4SKA - Feb 18 Dr. Grant Hampson
16 Low.CBF ITF Integration Test Facility (ITF) developed for the purposes of: development of the Low.CBF system selling off at L3 requirements local to the CSIRO team - requires emulators It s a single rack (1 of 6 - all very similar). Already proven useful in the progressing the cooling, power and networking supporting equipment 16 SKA Low Correlator & Beamformer - Towards Construction C4SKA - Feb 18 Dr. Grant Hampson
17 Low.CBF Key Specifications Data rates 6 Tbps of input data from LFAA 55 Tbps of internal data communication 5 to 8 Tbps of output data depending on correlator configuration Processing rate Station-based 58TMACs Beamformers 378TMACs Correlator 631TMACs Need combination of IO, Compute & Memory 60kW total power estimated Totals: 69Tbps 1067TMACs 17 SKA Low Correlator & Beamformer - Towards Construction C4SKA - Feb 18 Dr. Grant Hampson
18 Towards Construction What happens next? More CDRs, IGO, tenders, bids, contracts, construction? Can you see people stopping work? Engineers never stop thinking If they do they are working on a new telescope! Introduction of an early system Small number (4) of stations End-to-end signal chain Representative infrastructure 18 SKA Low Correlator & Beamformer - Towards Construction C4SKA - Feb 18 Dr. Grant Hampson
19 Early Production Array (EPA) Aims: Continuity and momentum of pre-construction teams Mitigate interface risks by practical integration activities Provide a future pathway for prototype development Develop a testbed for subsystem verification after local ITFs Demonstrate on sky measurements for end-to-end signal chain Enable onsite development to kick start construction activities Progress technically the telescope as a whole Not a science instrument but nothing verifies a system better than real signals 19 SKA Low Correlator & Beamformer - Towards Construction C4SKA - Feb 18 Dr. Grant Hampson
20 CSIRO EPA CSP Thoughts Focus on critical interfaces and fundamental DSP architecture Save bells and whistles for construction Cut down Low.CBF - correlator Miniature FPGA system Majority of code/equipment developed carries to construction Limited functionality (subset of full requirements) No zooms, RFI excision, VLBI One subarray of 4-stations (no sub-stations) Low.CBF ITF in Sydney For the development of Perentie (Low.CBF) Also contains emulators (LFAA/LMC/SDP interfaces) 20 SKA Low Correlator & Beamformer - Towards Construction C4SKA - Feb 18 Dr. Grant Hampson
21 EPA CSP Collaboration Continue to work as an international Perentie team Requires a broad supporting skill set New Zealand - AUT Emulators, FPGA code Model verification The Netherlands - ASTRON FPGA code, Hardware, mechanical Australia - CSIRO FPGA code, Software, Hardware Integration Test Facility (CBF and CSP) 21 SKA Low Correlator & Beamformer - Towards Construction C4SKA - Feb 18 Dr. Grant Hampson
22 Summary Need to complete CDR The EPA is an exciting new step in the evolution of the SKA telescope Need to design and plan EPA, and obtain funding to continue Strengthen collaborative relationships with new opportunities - LFAA? PAFs? Develop cutting edge, lower power, higher performance compute systems You never fail until you stop trying - Albert Einstein The best way to predict the future is to create it - Abraham Lincoln 22 SKA Low Correlator & Beamformer - Towards Construction C4SKA - Feb 18 Dr. Grant Hampson
23 Thank you Grant Hampson Research Engineer t e grant.hampson@csiro.au w /Research/Astronomy Peter Baillie Low.CBF Manager t e peter.baillie@aut.ac.nz w ASTRONOMY AND SPACE SCIENCE
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