Environmental noise is one of the critical issues for the observation of gravitational waves, but is difficult to predict in advance. Therefore, to evaluate the adverse impact of environmental noise on the detector sensitivity, understanding the detector response to the environmental noise in actual setup is crucial, for both the observation and future upgrades. In this paper, we introduce and verify a new method of the environmental noise injection test based on the post-observation commissioning of KAGRA. This new method (response function model) includes the frequency conversion and nonlinearity of power, which are the effects that are not considered in the current model (coupling function model) used in LIGO and Virgo. We also confirmed the validity of our method by applying it to an environmental noise-enriched dataset and successfully reproducing them.

环境噪声是引力波观测的关键问题之一，但很难提前预测。因此，要评估环境噪声对探测器灵敏度的不利影响，了解探测器在实际设置中对环境噪声的响应对于观测和未来升级至关重要。在本文中，我们介绍并验证了一种基于 KAGRA 观测后调试的环境噪声注入测试新方法。这种新方法（响应函数模型）包括功率的频率转换和非线性，这是LIGO和Virgo使用的当前模型（耦合函数模型）中没有考虑的影响。