标题： 多通道关联辐射计的光谱学 显示英文标题

标题： Spectroscopy with Multichannel Correlation Radiometers

摘要： 相关辐射计以高精度和小的系统误差进行功率的真实微分测量。 这种接收机架构已在射电天文学中用于连续谱辐射的测量超过50年；本文研究了使用相关技术进行宽频带光谱分析。 在一般讨论了相关性和混合相位的选择之后，展示了来自简单实验室多通道相关辐射计测试的实验结果。 对输入混合器相位效应的分析表明，90度混合器可能是射电天文学中最好的通用选择，这取决于它的幅度匹配和频率上的相位平坦性。 实验室结果验证了相关结构与模拟延迟相关器的组合是进行超宽带光谱分析的极佳方法。 显示英文摘要

摘要： Correlation radiometers make true differential measurements in power with high accuracy and small systematic errors. This receiver architecture has been used in radio astronomy for measurements of continuum radiation for over 50 years; this article examines spectroscopy over broad bandwidths using correlation techniques. After general discussions of correlation and the choice of hybrid phase, experimental results from tests with a simple laboratory multi-channel correlation radiometer are shown. Analysis of the effect of the input hybrid's phase shows that a 90 degree hybrid is likely to be the best general choice for radio astronomy, depending on its amplitude match and phase flatness with frequency. The laboratory results verify that the combination of the correlation architecture and an analog lag correlator is an excellent method for spectroscopy over very wide bandwidths.