Issue |
A&A
Volume 428, Number 1, December II 2004
|
|
---|---|---|
Page(s) | 287 - 298 | |
Section | Astronomical instrumentation | |
DOI | https://doi.org/10.1051/0004-6361:200400060 | |
Published online | 23 November 2004 |
A maximum likelihood approach to the destriping technique
1
University of Helsinki, Department of Physical Sciences, PO Box 64, 00014 Helsinki, Finland e-mail: hannu.kurki-suonio@helsinki.fi
2
Helsinki Institute of Physics, PO Box 64, 00014 Helsinki, Finland
3
Dipartimento di Fisica, Universitá di Milano, via Celoria 16, 20131 Milano, Italy
4
IASF/CNR, Sezione di Bologna, via Gobetti 101, 40129 Bologna, Italy
Received:
24
April
2003
Accepted:
28
June
2004
The destriping technique is a viable tool for removing different
kinds of systematic effects in CMB-related experiments. It has already been
proven to work for gain instabilities that produce the so-called noise
and periodic fluctuations due to e.g. thermal instability. Both effects, when
coupled to the observing strategy, result in stripes on the observed sky
region. Here we present a maximum-likelihood approach to this type of technique
and provide also a useful generalization. As a working case we consider a data
set similar to what the planck satellite will produce in its Low
Frequency Instrument (LFI). We compare our method to those presented in the
literature and find some improvement in performance. Our approach is also more
general and allows for different base functions to be used when fitting the
systematic effect under consideration. We study the effect of increasing the
number of these base functions on the quality of signal cleaning and
reconstruction. This study is related to planck LFI activities.
Key words: methods: data analysis / cosmology: cosmic microwave background
© ESO, 2004
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