Development of FFTS for Radio Astronomy

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Development of FFTS for Radio Astronomy. Sheng Li , Zhen-Hui Lin, Ji Yang Wen-Ying Duan, Qi-Jun Yao, Sheng-Cai Shi Purple Mountain Observatory, Chinese Academy of Sciences. Nov. 28 th , 2011 Sun-Moon Lake, Taiwan 2011 Advanced Telescope and Instrument Technology Conference. - PowerPoint PPT Presentation

Text of Development of FFTS for Radio Astronomy

  • Development of FFTS for Radio AstronomySheng Li, Zhen-Hui Lin, Ji YangWen-Ying Duan, Qi-Jun Yao, Sheng-Cai ShiPurple Mountain Observatory, Chinese Academy of SciencesNov. 28th, 2011 Sun-Moon Lake, Taiwan2011 Advanced Telescope and Instrument Technology Conference

    Nov. 28th, 20112011 Advanced Telescope and Instrument Technology Conference*

    Requirement: Broadband & high resolutionWhy broad bandwidth?f/fo= v/cFor submillimeter-wave observation

    Nov. 28th, 20112011 Advanced Telescope and Instrument Technology Conference*

    Requirement: Broadband & high resolutionWhy broad bandwidth?f/fo= v/cFor high-redshift objects survey

    100MHz bandwidth only covers ~300km/s!!!Credit: Young, J. S et al. 1984, ApJ, 287, 153

    Nov. 28th, 20112011 Advanced Telescope and Instrument Technology Conference*

    Requirement: Broadband & high resolutionWhy high frequency resolution?For observe fine structure of molecular lines

    For knowing the kinematics characteristics of objects

    Credit: Schnee, S. et al. 2005, ApJ, 624, 254

    Nov. 28th, 20112011 Advanced Telescope and Instrument Technology Conference*

    Evolvement: From analog to digital Analog back-end systemFilterbank & AOS4x1GHz@1MHzHerschelHiFi

    Nov. 28th, 20112011 Advanced Telescope and Instrument Technology Conference*

    Evolvement: From analog to digital Digital back-end system

    Correlator, 3bits or 2bits8x2GHz@15.625MHz8x250MHz@244kHzCorrelator, 2bits8x24x82MHz@ 812.5 kHz

    Nov. 28th, 20112011 Advanced Telescope and Instrument Technology Conference*

    FFTS: Principle

    Nov. 28th, 20112011 Advanced Telescope and Instrument Technology Conference*

    Spectral system evolvement at PMO2006,082010,11

    Nov. 28th, 20112011 Advanced Telescope and Instrument Technology Conference*

    FFTS: Firmware developmentFirmware Structure based on AC240Hardware structure of AC240AC240 Board

    Nov. 28th, 20112011 Advanced Telescope and Instrument Technology Conference*

    FFTS: Firmware developmentParallel pipeline FFT core structure

    Nov. 28th, 20112011 Advanced Telescope and Instrument Technology Conference*

    FFTS: Firmware developmentProgram language: VHDLDesign tool: ISE 9.1Resource utility

    Nov. 28th, 20112011 Advanced Telescope and Instrument Technology Conference*

    FFTS: Software developmentHuman-computer interaction - Quicklook GUIData processing Multithreading 9 data processing sub-thread, 2 communication sub-threadData Communication (TCP/IP, 1Gb/s) Data Storage (NFS)

    Nov. 28th, 20112011 Advanced Telescope and Instrument Technology Conference*

    FFTS: Software developmentQuicklook GUI

    Nov. 28th, 20112011 Advanced Telescope and Instrument Technology Conference*

    FFTS: PerformanceTest resultsIntegration Time: 32.768msDynamic Range: >30dBADC Full Scale: 1VStability/Allan-Variance: ~3000s

    Nov. 28th, 20112011 Advanced Telescope and Instrument Technology Conference*

    FFTS: PerformanceObservation results

    Nov. 28th, 20112011 Advanced Telescope and Instrument Technology Conference*

    FFTS: Back-end system integrationIntegration with data storage systemGigabits internet20~40 MB/s data transfer rate with OTF1Gb/s internet connectionRAID-5 disk array for both high speed and reliability34T bytes storage capacity (data of a month)

    Nov. 28th, 20112011 Advanced Telescope and Instrument Technology Conference*

    Future planBack-end for dome A telescopeBroadband with high resolutionLow power consumptionHigh level of integrationHigh stability

    2011-2012, hardware, firmware & software development2~2.5 GHz bandwidth, 16 k channels(122 kHz)2013-2015>=4 GHz bandwidth, >=32k channels

    Nov. 28th, 20112011 Advanced Telescope and Instrument Technology Conference*

    Thanks for your attention~

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