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.
Advanced pseudo-correlation radiometers for the Planck-LFI instrument / A. Mennella, M. Bersanelli, R.C. Butler, D. Maino, N. Mandolesi, G. Morgante, L. Valenziano, F. Villa, T. Gaier, M. Seiffert, S. Levin, C. Lawrence, P. Meinhold, P. Lubin, J. Tuovinen, J. Varis, T. Karttaavi, N. Hughes, P. Jukkala, P. Sjman, P. Kangaslahti, N. Roddis, D. Kettle, F. Winder, E. Blackhurst, R. Davis, A. Wilkinson, C. Castelli, B. Aja, E. Artal, L. Fuente, A. Mediavilla, J.P. Pascual, J. Gallegos, E. Martinez Gonzalez, P. Paco, L. Pradell - In: Advanced pseudo-correlation radiometers for the Planck-LFI instrument[s.l] : ESA, 2003.
Advanced pseudo-correlation radiometers for the Planck-LFI instrument
A. Mennella;M. Bersanelli;D. Maino;
2003
Abstract
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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