SOI-MDI Onboard Real Time Data Reduction - Requirements and Design.

Details SOI-MDI Onboard Real Time Data Reduction - Requirements and Design. SOI-MDI Onboard Real Time Data Reduction - Requirements and Design.

May 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...180.0608m&link_type=abstract

American Astronomical Society, 180th AAS Meeting, #06.08; Bulletin of the American Astronomical Society, Vol. 24, p.737

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SOI-MDI is a space-based high-resolution helioseismology experiment. To observe Solar oscillations accurately requires a long time base of (nearly) continuous observations. Due to telemetry restrictions, SOI-MDI must carry out onboard data reduction of the high-resolution observations prior to sending the data to the ground. This paper summarizes the reduction requirements and discusses the hardware and software design of the processor built to meet these requirements. The main computational requirement to be met is the one-minute observing cadence, required to observe a solar signal with a Nyquist frequency corresponding to a 2-minute period. The analysis requires computing dopplergrams from the observed filtergrams and a partial spherical harmonic decomposition of the full disk dopplergrams. A custom image processor was designed to meet these specifications. Other requirements include low power, radiation tolerance and light weight. A design based on an ASIC, designed around the 2903 bitslice family of processors, has been developed to meet these requirements. The CPU includes three memory busses with simultaneous DMA transfers to main memory and a one-cycle 16 bit multiplier. Simultaneous access to the main memory by the CCD Camera, via a DMA memory adder (also implemented as an ASIC), and by the telemetry subsystem give the system sufficient performance to handle the 30 Mb/minute of input data. This work was supported by NASA Contract NAS5-30386 and Stanford Contract PR-6209.

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