Reconstruction and Removal of Thermal Effects in Planck/LFI Scientific Data Streams Using Telemetry Information

The ESA CMB Planck mission will require an accurate control and removal of instrumental systematics below a level of few μ K. Although instruments and spacecraft are designed to he instrinsically very stable, the extremely tight requirements concerning signal stability call for the development of software strategies to remove the residual spurious effects during data analysis. A particularly important class of systematic effects is represented by low-frequency periodic fluctuations that can be removed using properly designed ‘Blind’ filters applied to the scientific data streams. However, telemetry information monitoring the instrument status may improve the effectiveness of removal procedures. A good example is given by thermal instabilities of the 20 K stage of the PLANCK cooling chain. A successful, yet simple approach to remove such fluctuations has been developed; the method combines thermal housekeeping data with scientific data to reconstruct the transfer functions connecting the 20 K stage temperature fluctuations with the perturbations detected by each radiometer. The work has been carried out using temperature measurements of the prototype of the Planck 20K Sorption Cooler combined with a thermal model of the LFI instrument and a software specifically developed to simulate long term-variations which are not available from the Cooler experimental data. This code (named GLISSANDO) is also discussed at the end of this paper.

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Author and article information

Contributors

M. Maris

Conference

Publication date: April 2004

Publication date (Print): April 2004

Pages: 1-6

Affiliations

[0001]INAF - Osservatorio Astronomico di Trieste,

Via G.B.Tiepolo 11, I-34131, Trieste, Italy

[0002]IASF - Bologna,

Via Gobetti 101, I40129, Bologna, Italy

[0003]INAF- IASF, Milano section,

Via Bassini, 15, I20133, Milano, Italy

[0004]Dip. Fisica Univ. di Milano,

Via G.Celoria 16, I20133, Milano, Italy

[0005]JPL, CalTech, 4800 Oak Grove Drive,

Pasadena, California, 91109-8099, USA

Article

DOI: 10.14236/ewic/ADA-III2004.18

SO-VID: 6d969174-5a87-4b28-b0cc-f951911f8abe

Copyright statement: © M. Maris et al. Published by BCS Learning and Development Ltd. ADA-III - Astronomical Data Analysis III Conference, Sant' Agata sui due Golfi, Italy

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This work is licensed under a Creative Commons Attribution 4.0 Unported License. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

Conference name: ADA-III - Astronomical Data Analysis III Conference

Conference acronym: ADA

Conference number: 3

Conference location: Sant' Agata sui due Golfi, Italy

Conference date: 29 April - 1 May 2004

Conference sponsor: Electronic Workshops in Computing (eWiC)

Conference theme: Astronomical Data Analysis

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Product Information: 1477-9358BCS Learning & Development

Self URI (article page): https://www.scienceopen.com/hosted-document?doi=10.14236/ewic/ADA-III2004.18

Self URI (journal page): https://ewic.bcs.org/

Reconstruction and Removal of Thermal Effects in Planck/LFI Scientific Data Streams Using Telemetry Information

Abstract