An iterative destriping technique for diffuse background polarization data

Free access article

Issue		A&A Volume 401, Number 3, April III 2003


Page(s)		1215 - 1222
Section		Physical and chemical processes
DOI		http://dx.doi.org/10.1051/0004-6361:20030200

A&A 401, 1215-1222 (2003)
DOI: 10.1051/0004-6361:20030200

An iterative destriping technique for diffuse background polarization data

C. Sbarra¹, E. Carretti¹, S. Cortiglioni¹, M. Zannoni², R. Fabbri³, C. Macculi¹ and M. Tucci⁴

¹ IASF-CNR Bologna, via P. Gobetti 101, 40129 Bologna, Italy
    e-mail: carretti@bo.iasf.cnr.it; cortiglioni@bo.iasf.cnr.it; macculi@bo.iasf.cnr.it
² IASF-CNR Milano, via Bassini 15, 20133 Milano, Italy
    e-mail: zannoni@mi.iasf.cnr.it
³ Dipartimento di Fisica, Università di Firenze, via Sansone 1, 50019 Sesto Fiorentino, Italy
    e-mail: fabbrir@unifi.it
⁴ Instituto de Fisica de Cantabria, Avda. Los Castros s/n, 39005 Santander, Spain
    e-mail: tucci@ifca.unican.es

(Received 18 December 2002 / Accepted 13 February 2003)

Abstract
We describe a simple but effective iterative procedure specifically designed to destripe Q and U Stokes parameter data as those collected by the SPOrt experiment onboard the International Space Station (ISS). The method is general enough to be useful for other experiments, both in polarization and total intensity. The only requirement for the algorithm to work properly is that the receiver knee frequency must be lower than the signal modulation frequency, corresponding in our case to the ISS orbit period. Detailed performances of the technique are presented in the context of the SPOrt experiment, both in terms of added rms noise and residual correlated noise.

Key words: cosmic microwave background -- polarization -- cosmology: observations -- methods: data analysis -- methods: numerical

Offprint request: C. Sbarra, sbarra@bo.iasf.cnr.it

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