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 : 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

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. 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

6. Signal to noise ratios 5476918 591908 287460 21507 24 10 s 3872766
418542
203265
15207 23
5 s
264709
128556
9618 21
2 s
187178
90903
6801 20
1 s
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 nm nm
17-70 nm
1-20 nm
nb of bits needed
Integration Time
PIN
MSM
SNR