Advanced pseudo-correlation radiometers for the Planck-LFI instrument

Details Advanced pseudo-correlation radiometers for the Planck-LFI instrument Advanced pseudo-correlation radiometers for the Planck-LFI instrument

2003-07-07

arxiv.org/abs/astro-ph/0307116v1

Proc 3rd ESA Workshop on millimetre wave technology and applications (ESPOO, 21-23 May 2003), Page 69

Astronomy and Astrophysics

Astrophysics

6 pages, 3 figures

Scientific paper

The LFI (Low Frequency Instrument) on board the ESA Planck satellite is constituted by an array of radiometric detectors actively cooled at 20 K in the 30-70 GHz frequency range in the focal plane of the Planck telescope. In this paper we present an overview of the LFI instrument, with a particular focus on the radiometer design. The adopted pseudo-correlation scheme uses a software balancing technique (with a tunable parameter called gain modulation factor) which is effective in reducing the radiometer susceptibility to amplifier instabilities also in presence of small non-idealities in the radiometric chain components, provided that the gain modulation factor is estimated with an accuracy of the order of 0.2%. These results have been recently confirmed by experimental laboratory measurements conducted on the LFI prototype radiometers at 30, 70 and 100 GHz.

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