非偏振源射电干涉测量中偏振泄漏闭合误差的求解
Solving for closure errors due to polarization leakage in radio interferometry of unpolarized sources
摘要：
机械和电子缺陷会导致无线电干涉仪的各个天线中的极化泄漏。这样的泄漏表现为闭合误差，即使在非偏振源的共极能见度测量。本文介绍并检验了一种用{ \it only}非偏振校准器的名义共极振子研究射电干涉望远镜偏振泄漏的方法。由此产生的封闭阶段的庞加莱球的解释。由于非极化源的使用，泄漏参数的实际解决方案是受退化的讨论。然而，这并不影响我们的计划中的闭合误差的校正。
英文摘要：
Mechanical and electronic imperfections can result into polarization leakage in individual antennas of a radio interferometer. Such leakages manifest themselves as closure errors even in co-polar visibility measurements of unpolarized sources. This paper describes and tests a method for the study of polarization leakage for radio interferometric telescopes using {\it only} the nominally co-polar visibilities for unpolarized calibrators. Interpretation of the resulting closure phases on the Poincaré sphere is presented. Since unpolarized sources are used, the actual solutions for leakage parameters is subject to a degeneracy which is discussed. This however, does not affect the correction of closure errors in our scheme.
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