Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-02-15
Astronomy and Astrophysics
Astrophysics
18 pages, 3 figures, New Astronomy accepted
Scientific paper
10.1016/S1384-1076(02)00099-4
Observation of the fine structures (anisotropies, polarization, spectral distortions) of the Cosmic Microwave Background (CMB) is hampered by instabilities, 1/f noise and asymmetries of the radiometers used to carry on the measurements. Addition of modulation and synchronous detection allows to increase the overall stability and the noise rejection of the radiometers used for CMB studies. In this paper we discuss the advantages this technique has when we try to detect CMB polarization. The behaviour of a two channel correlation receiver to which phase modulation and synchronous detection have been added is examined. Practical formulae for evaluating the improvements are presented.
Battistelli Elia
Boella Giuliano
Gervasi Massimo
Sironi Giorgio
Spiga Daniele
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