LYRA on-board software

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Presentation transcript:

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,… Direct commands Rearrangement and compression of the data (Data Manager)

Acquisition Objectives : Parameters : 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

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

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

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