The Self-Powered Extravehicular Mobility Unit (EMU) Extravehicular Activity (EVA) Data Recorder (SPEEDR) is a field-programmable gate array (FPGA)-based device designed to collect high-rate EMU Primary Life Support Subsystem (PLSS) data for download at a later time. During EVA, the existing EMU PLSS data downlink capability is one data packet every 2 minutes and is subject to bad packets or loss of signal. Higher-rate PLSS data is generated by the Enhanced Caution and Warning System but is not normally captured or distributed. Access to higher-rate data will increase the capability of EMU anomaly resolution team to pinpoint issues remotely, saving crew time by reducing required call-down Q&A and on-orbit diagnostic activities. With no Space Shuttle flights post Fiscal Year 2011 (FY11), and potentially limited down-mass capability, the ISS crew and ground support personnel will have to be capable of on-orbit operations to maintain, diagnose, repair, and return to service EMU hardware, possibly through 2028. Collecting high-rate EMU PLSS data during both intravehicular activity (IVA) and EVA operations will provide trending analysis for life extension and/or predictive performance. The SPEEDR concept has generated interest as a tool/technology that could be used for other International Space Station subsystems or future exploration-class space suits where hardware reliability/availability is critical and low/variable bandwidth may require store then forward methodology. Preliminary work in FY11 produced a functional prototype consisting of an FPGA evaluation board, custom memory/interface circuit board, and custom software. The SPEEDR concept includes a stand-alone battery that is recharged by a computer Universal Serial Bus (USB) port while data are being downloaded.


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    Title :

    Development of the Self-Powered Extravehicular Mobility Unit Extravehicular Activity Data Recorder


    Contributors:

    Conference:

    International Conference on Environmental Systems ; 2012 ; San Diego, CA, United States


    Publication date :

    2012-01-01


    Type of media :

    Conference paper


    Type of material :

    No indication


    Language :

    English





    Development of the Self-Powered Extravehicular Mobility Unit Extravehicular Activity Data Recorder

    Hill, T. / Murray, S. / Wichowski, R. et al. | British Library Conference Proceedings | 2012


    Extravehicular mobility unit

    Maurice A. Carson / Michael N. Rouen / Charles C. Lutz et al. | NTRS | 1975


    Extravehicular Mobility Unit (EMU)

    Bottomley, T. A., Jr. | NTRS | 1967


    Skylab extravehicular activity

    Schultz, D. C. / Millican, R. S. / Kain, R. R. | NTRS | 1974