CMB observations: improvements of the performance of correlation radiometers by signal modulation and synchronous detection |
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| Institution: | 1. Department of Electrical Engineering, Indian Institute of Technology Kanpur, Kanpur 208016, India;2. Discipline of Electrical Engineering, Indian Institute of Technology Indore, Indore 453552, India;1. School of Electrical Engineering, Yanshan University, Qinhuangdao, Hebei 066004, PR China;2. School of Vehicles and Energy, Yanshan University, Qinhuangdao, Hebei 066004, PR China;1. Department of Electrical Engineering and Information Systems, Graduate School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan;2. Department of Bioengineering, Graduate School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan;3. Center for Spintronics Research Network, Graduate School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan |
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| Abstract: | 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. |
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