On-board de-spiking implemented by MAJIS, the VIS/NIR imaging spectrometer of JUICE

Yves Langevin; Massimo Zambelli; Pierre Guiot

doi:10.1117/12.2562464

13 December 2020 On-board de-spiking implemented by MAJIS, the VIS/NIR imaging spectrometer of JUICE

Yves Langevin, Massimo Zambelli, Pierre Guiot

Proceedings Volume 11443, Space Telescopes and Instrumentation 2020: Optical, Infrared, and Millimeter Wave; 1144378 (2020) https://doi.org/10.1117/12.2562464
Event: SPIE Astronomical Telescopes + Instrumentation, 2020, Online Only

Conference Poster

Abstract

MAJIS is an imaging spectrometer operating in the visible and IR range which is part of the payload of the JUICE mission of ESA, dedicated to the study of the icy moons of Jupiter, Jupiter and the Jupiter environment, to be launched in June 2022. MAJIS implements two channels, one for the visible-near IR range (0.5 – 2.35 μm) and one for the IR range (2.25 – 5.52 μm). Each channel collects photons with a H1RG detector^1,2. The trajectory of the JUICE spacecraft in the Jupiter system crosses the radiation belts, in particular during flybys of Europa and Ganymede as well as during the orbiting phase around Ganymede (280 days). The Jupiter radiation belts are the most intense in the solar system, hence a combination of shielding and on-board processing has been implemented for handling the impact rate of high energy electrons, each generating large numbers of electrons (“spikes”) when impacting detector pixels. The de-spiking approach consists in splitting each acquisition into N = 2 to 8 sub-integrations, then sorting the resulting N values for each pixel, averaging a subset of the lowest values. This selective averaging approach effectively sort outs subintegrations impacted by a spike so as to meet a target of less than 1% corrupted pixels for each frame. This can be achieved by adjusting the sorting strategy to the local high energy electron flux, which strongly depends on the distance from Jupiter and on the latitude. Specific selective averaging strategies can also be implemented for mitigating possible instrumental artefacts.

Citation Download Citation

Yves Langevin, Massimo Zambelli, and Pierre Guiot "On-board de-spiking implemented by MAJIS, the VIS/NIR imaging spectrometer of JUICE", Proc. SPIE 11443, Space Telescopes and Instrumentation 2020: Optical, Infrared, and Millimeter Wave, 1144378 (13 December 2020); https://doi.org/10.1117/12.2562464

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