We address in this work the instrumental systematic errors that can potentially affect the forthcoming and future Cosmic Microwave Background experiments aimed at observing its polarized emission. In particular, we focus on the systematics induced by the beam and calibration, which are considered the major sources of leakage from total intensity measurements to polarization. We simulated synthetic data sets with Time-Ordered Astrophysics Scalable Tools, a publicly available simulation and data analysis package. We also propose a mitigation technique aiming at reducing the leakage by means of a template fitting approach. This technique has shown promising results reducing the leakage by 2 orders of magnitude at the power spectrum level when applied to a realistic simulated data set of the LiteBIRD satellite mission.

我们在这项工作中解决了仪器系统误差，这些误差可能会影响即将进行和未来旨在观察其极化发射的宇宙微波背景实验。特别是，我们关注由光束和校准引起的系统学，它们被认为是从总强度测量到偏振的主要泄漏源。我们使用 Time-Ordered Astrophysics Scalable Tools 模拟合成数据集，这是一个公开可用的模拟和数据分析包。我们还提出了一种缓解技术，旨在通过模板拟合方法减少泄漏。当应用于 LiteBIRD 卫星任务的真实模拟数据集时，该技术已显示出可喜的结果，可将功率谱级别的泄漏减少 2 个数量级。