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

      , , , , , , ,

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

      Astronomical Data Analysis

      29 April - 1 May 2004

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          The ESA CMB Planck mission will require an accurate control and removal of instrumental systematics below a level of few μK. 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

          April 2004
          April 2004
          : 1-6
          INAF - Osservatorio Astronomico di Trieste,

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

          Via Gobetti 101, I40129, Bologna, Italy
          INAF- IASF, Milano section,

          Via Bassini, 15, I20133, Milano, Italy
          Dip. Fisica Univ. di Milano,

          Via G.Celoria 16, I20133, Milano, Italy
          JPL, CalTech, 4800 Oak Grove Drive,

          Pasadena, California, 91109-8099, USA
          © 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

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


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