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LYRA on-board software

LYRA on-board software. On-board software. Management of the scientific and maintenance operations (Instrument Manager) Automatic modes : Warm up, Acquisition, Idle, Off, Asic reload, Latch up → via the instrument operation sheet (IOS) Occasional procedures: large off-pointings, bake-out,…

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LYRA on-board software

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  1. LYRA on-board software

  2. On-board software Management of the scientific and maintenance operations (Instrument Manager) Automatic modes : Warm up, Acquisition, Idle, Off, Asic reload, Latch up → via the instrument operation sheet (IOS) Occasional procedures: large off-pointings, bake-out,… Direct commands Rearrangement and compression of the data (Data Manager)

  3. Acquisition Objectives : Gathering of scientific data Calibrations (LEDs, dark current, off-pointings) Parameters : Acquisition cadence : from 100Hz to 0.1Hz Acquisition with one or two detectors Calibration LEDs  = 465 nm  = 390 nm, pulsed or not VFC (Voltage to Frequency Converter) calibration frequency Covers : open or closed

  4. Data manager Parameters : Enable / disable the rearrangement of data : Truncation of the packaging bits Repartition of the data successively in two telemetry packets Sorting of the data wrt. their origin (which unit, real data or VFC calibration data) and their validity Association of timestamps to the data Enable / disable the compression : lossless Lempel-Ziv Welch compression scheme Re-sampling of the data

  5. Instrument LYRA SWAP Acquisition Cadence 20Hz 50Hz 100Hz Number of units 1 2 1 2 1 2 Total before compression (en MBytes) 26 51 64 127 128 253 2160 Total after compression (en MBytes) 7 13 17 33 34 65 151 Telemetry (one day)

  6. Signal to noise ratios SNR MSM PIN Integration Time nb of bits needed 1-20 nm 17-70 nm 115-125 nm 200-220 nm 10 ms 14 680 9090 18718 173195 20 ms 15 962 12856 26471 244935 50 ms 16 1521 20326 41854 387277 100 ms 17 2151 28746 59191 547692 200 ms 18 3041 40653 83708 774553 500 ms 19 4809 64278 132355 1224676 1 s 20 6801 90903 187178 1731954 2 s 21 9618 128556 264709 2449352 5 s 23 15207 203265 418542 3872766 10 s 24 21507 287460 591908 5476918

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