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

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      ADA-III - Astronomical Data Analysis III Conference (ADA)

      Astronomical Data Analysis

      29 April - 1 May 2004

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            Abstract

            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.

            Content

            Author and article information

            Contributors
            Conference
            April 2004
            April 2004
            : 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
            10.14236/ewic/ADA-III2004.18
            6d969174-5a87-4b28-b0cc-f951911f8abe
            © M. Maris et al. Published by BCS Learning and Development Ltd. ADA-III - Astronomical Data Analysis III Conference, Sant' Agata sui due Golfi, Italy

            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/

            ADA-III - Astronomical Data Analysis III Conference
            ADA
            3
            Sant' Agata sui due Golfi, Italy
            29 April - 1 May 2004
            Electronic Workshops in Computing (eWiC)
            Astronomical Data Analysis
            Product
            Product Information: 1477-9358BCS Learning & Development
            Self URI (journal page): https://ewic.bcs.org/
            Categories
            Electronic Workshops in Computing

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