Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-07-31
Astron.Astrophys.410:1089-1100,2003
Astronomy and Astrophysics
Astrophysics
12 pages, 8 figures, accepted for publication in A&A (updated version with few editorial changes)
Scientific paper
10.1051/0004-6361:20031266
Radiometeric CMB measurements need to be highly stable and this stability is best obtained with differential receivers. The residual 1/f noise in the differential output is strongly dependent on the radiometer input offset which can be cancelled using various balancing strategies. In this paper we discuss a software method implemented in the Planck-LFI pseudo-correlation receivers which uses a tunable "gain modulation factor, r, in the sky-load difference. Numerical simulations and experimental data show how proper tuning of the parameter r ensures a very stable differential output with knee frequencies of the order of few mHz. Various approaches to calculate r using the radiometer total power data are discussed with some examples relevant to Planck-LFI. Although the paper focuses on pseudo-correlation receivers and the examples are relative to Planck-LFI, the proposed method and its analysis is general and can be applied to a large class of differential radiometric receivers.
Bersanelli Marco
Kettle Danielle
Meinhold Peter
Mennella Aniello
Roddis Neil
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