high-level ska signal processing description - The Square Kilometre ...

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WP2‐040.030.010‐TD‐001 Revision : 1 DOCUMENT HISTORY Revision Date Of Issue Engineering Change Number Comments A ‐ ‐ First draft release for internal review B ‐ ‐ C ‐ ‐ 1 29 th March 2011 ‐ First release DOCUMENT SOFTWARE Package Version Filename Wordprocessor MsWord Word 2007 01a‐WP2‐040.030.010‐TD‐001‐1_HighLevelDescr Block diagrams Other ORGANISATION DETAILS Name Physical/Postal Address SKA Program Development Office Jodrell Bank Centre for Astrophysics Alan Turing Building <strong>The</strong> University of Manchester Oxford Road Manchester, UK M13 9PL Fax. +44 (0)161 275 4049 Website www.<strong>ska</strong>telescope.org 2011‐03‐29 Page 2 of 59
WP2‐040.030.010‐TD‐001 Revision : 1 TABLE OF CONTENTS 1 INTRODUCTION ............................................................................................. 7 1.1 Purpose of the document ....................................................................................................... 8 2 REFERENCES ................................................................................................ 9 3 HIERARCHY ................................................................................................ 11 3.1 Hierarchical Lifecycle ............................................................................................................ 11 4 ELEMENT LEVEL: SIGNAL PROCESSING .............................................................. 12 4.1 Environment .......................................................................................................................... 14 4.2 Simulator ............................................................................................................................... 14 4.3 Receptors .............................................................................................................................. 14 4.4 VLBI ....................................................................................................................................... 15 4.5 Power .................................................................................................................................... 15 4.6 Cooling .................................................................................................................................. 15 4.7 External Transient Triggers ................................................................................................... 15 4.8 Time Reference ..................................................................................................................... 15 4.9 Science Computing ................................................................................................................ 16 4.10 Monitoring and Control ........................................................................................................ 16 4.11 Stakeholders ......................................................................................................................... 16 5 SUBSYSTEM ............................................................................................... 17 6 RFI EXCISION ............................................................................................ 21 7 CORRELATOR ............................................................................................. 24 7.1 Delay Compensation Buffer .................................................................................................. 25 7.2 Channeliser ........................................................................................................................... 25 7.3 Corner Turn ........................................................................................................................... 28 7.4 Full Stokes Correlator ............................................................................................................ 29 7.4.1 Correlation Integration Period ...................................................................................... 29 7.4.2 Correlator Processing Load ........................................................................................... 30 8 CENTRAL BEAMFORMER ............................................................................... 32 8.1 Buffer .................................................................................................................................... 33 8.2 Voltage Storage ..................................................................................................................... 33 8.3 Beamforming ........................................................................................................................ 33 9 DE‐DISPERSION .......................................................................................... 35 9.1 Incoherent Dedispersion ....................................................................................................... 35 9.2 Delay and Sum Dedispersion ................................................................................................ 36 9.3 Pre‐summing channels for large dispersion measures ......................................................... 36 2011‐03‐29 Page 3 of 59
Page 1: HIGH‐LEVEL SKA SIGNAL PROCESSING
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