干涉仪主光束偏振泄漏相位和振幅的校正
Correcting the Polarization Leakage Phases and Amplitudes Throughout the Primary Beam of an Interferometer
摘要：
偏振观测受非偏振光泄漏到偏振通道的影响，其方式随光源相对于光轴的角位置而变化。泄漏的离轴部分通常通过从每个偏振图像中减去非偏振图和泄漏图的乘积来校正，但是很少意识到阵列中的不均匀性以基线依赖的方式移动泄漏辐射的轨迹。本文提出了一种测量和消除非均匀基阵宽场偏振泄漏的方法。该过程还映射每个天线的复杂电压模式，其可用于校正由于初级波束引起的成像误差的所有斯托克斯参数。
英文摘要：
Polarimetric observations are affected by leakage of unpolarized light into the polarization channels, in a way that varies with the angular position of the source relative to the optical axis. The off-axis part of the leakage is often corrected by subtracting from each polarization image the product of the unpolarized map and a leakage map, but it is seldom realized that heterogeneities in the array shift the loci of the leaked radiation in a baseline-dependent fashion. We present here a method to measure and remove the wide-field polarization leakage of a heterogeneous array. The process also maps the complex voltage patterns of each antenna, which can be used to correct all Stokes parameters for imaging errors due to the primary beams.
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