Observations : improvements of the performance of correlation radiometers by signal modulation and synchronous detection
Observations : improvements of the performance of correlation radiometers by signal modulation and synchronous detection
复制标题
观察：通过信号调制和同步检测改进相关辐射计的性能
DOI：
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发表时间：
2008
期刊：
影响因子：
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通讯作者：
G. Sironi
中科院分区：
文献类型：
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作者：
D. Spiga;E. Battistelli;G. Boella;M. Gervasi;M. Zannoni;G. Sironi
宇宙微波背景（CMB）精细结构（各向异性、偏振、频谱畸变）的观测受到用于测量的辐射计的不稳定性、1/f噪声和不对称性的阻碍。增加调制和同步检测可以提高用于CMB研究的辐射计的整体稳定性和噪声抑制能力。在本文中，我们讨论了在尝试探测CMB偏振时该技术所具有的优势。研究了添加了相位调制和同步检测的双通道相关接收机的性能。给出了评估改进效果的实用公式。
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.