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Digital Signal Processing

Digital Signal Processing. A Green Bank Perspective. John Ford. Contributions from Scott Ransom, Paul Demorest and Jason Ray. Outline. Digital Signal Processing Trends Available Computing Power Architectures Recent Developments at Green Bank

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Digital Signal Processing

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  1. Digital Signal Processing A Green Bank Perspective • John Ford • Contributions from Scott Ransom, Paul Demorest and Jason Ray

  2. Outline Digital Signal Processing Trends Available Computing Power Architectures Recent Developments at Green Bank The Green Bank Ultimate Pulsar Processing Instrument (GUPPI) Future Developments Continuous GUPPI Upgrades New GBT Spectrometer New Backends for the 20 Meter SkyNet Project Phased Array Feed beamformers

  3. DSP Trends – Computing Power

  4. DSP Trends - Architecture • Possible Architectures • Multi-core conventional CPUs • Graphical Processing Units (GPU) • Reconfigurable Computing Elements (FPGA based Processors)

  5. Heterogeneous Computing • A System consisting of two or more disparate types of computing elements • Typically a mixture of the following • Traditional CPUs • Reconfigurable computing elements (FPGAs) • Graphical Processing Units • Use • Reconfigurable computing elements for the fastest streaming fixed-point signal processing and data distribution • GPUs for fast floating-point and memory intensive operations • General Purpose CPUs for managing the systems, handling data, and for non-parallelizable parts of the computations

  6. Pulsar Backends • Search mode backends • Fast-dump spectrometer • Time resolution of 50 to 100 microseconds • Frequency resolution of 25 KHs to 1 MHz • Bandwidth more important than data quality • Timing backends • Known pulsar period allows folding data • Coherent De-dispersion required • Very high time resolution, ~ 1 microsecond • Data quality is important

  7. GUPPI Specifications • Search Mode • Dual polarization, 8 bit real sampling, 800 MHz bandwidth inputs • Configurable signal processing • 64 to 4096 spectral channels • 100, 200, 400 and 800 MHz bandwidth • Configurable output rates and dump time • 4, 8, or 16 bit outputs at ~50 microsecond dump time • Front end hardware capable of supporting Coherent De-dispersion modes • Timing Mode • 800 MHz Coherent De-dispersion • 1 to 4 MHz channel widths, 8 bit sampling

  8. GUPPI Hardware Configuration

  9. GUPPI Block Diagram

  10. GUPPI Signal Processing with CASPER

  11. CompleteGUPPI

  12. Interstellar Dispersion

  13. GUPPI Coherent De-dispersion Mode

  14. Profile Comparison

  15. Profile Comparison

  16. Future Developments • Continuous GUPPI enhancements • More bandwidth • New algorithms • Array receiver/ multi-beam support • Multiple IF inputs • Huge data handling requirements • Huge computational load • New GBT Spectrometer • New Backends for Radio SkyNet • Wide-band Phased Array Feed Beamformers • Front-end signal processing

  17. Development Systems

  18. 43m GUPPI with RFI package

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