The LSST survey will provide unprecedented statistical power for measurements of dark energy. Consequently, controlling systematic uncertainties is becoming more important than ever. The LSST observing strategy will affect the statistical uncertainty and systematics control for many science cases; here, we focus on weak lensing systematics. The fact that the LSST observing strategy involves hundreds of visits to the same sky area provides new opportunities for systematics mitigation. We explore these opportunities by testing how different dithering strategies (pointing offsets and rotational angle of the camera in different exposures) affect additive weak lensing shear systematics on a baseline operational simulation, using the $\rho-$statistics formalism. Some dithering strategies improve systematics control at the end of the survey by a factor of up to $\sim 3-4$ better than others. We find that a random translational dithering strategy, applied with random rotational dithering at every filter change, is the most effective of those strategies tested in this work at averaging down systematics. Adopting this dithering algorithm, we explore the effect of varying the area of the survey footprint, exposure time, number of exposures in a visit, and exposure to the Galactic plane. We find that any change that increases the average number of exposures (in filters relevant to weak lensing) reduces the additive shear systematics. Some ways to achieve this increase may not be favorable for the weak lensing statistical constraining power or for other probes, and we explore the relative trade-offs between these options given constraints on the overall survey parameters.

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优化弱透镜系统的 LSST 观测策略

LSST 巡天将为暗能量测量提供前所未有的统计能力。因此，控制系统不确定性变得比以往任何时候都更加重要。LSST 观测策略将影响许多科学案例的统计不确定性和系统学控制；在这里，我们专注于弱透镜系统学。LSST 观测策略涉及对同一天空区域进行数百次访问这一事实为系统性缓解提供了新的机会。我们通过使用 $\rho-$ 统计形式主义测试不同的抖动策略（不同曝光下相机的指向偏移和旋转角度）如何影响基线操作模拟中的加性弱透镜剪切系统来探索这些机会。一些抖动策略在调查结束时提高了系统控制，比其他策略高出 3-4 美元。我们发现随机平移抖动策略，在每次过滤器更改时应用随机旋转抖动，是这项工作中测试的最有效的策略，可以平均降低系统性。采用这种抖动算法，我们探索了改变调查足迹区域、曝光时间、访问中的曝光次数以及对银河平面的曝光的影响。我们发现任何增加平均曝光次数（在与弱透镜相关的过滤器中）的变化都会降低加性剪切系统。实现这种增加的某些方法可能不利于弱透镜统计约束力或其他探针，