In this paper. we propose a new method to quantitatively evaluate the quality of the copyright phase observation signals of the BeiDou Navigation Satellite System (BDS) during weak and moderate geomagnetic storms. We take a moderate geomagnetic storm that occurred on 12 May 2021 during the 25th solar cycle as an example. The results show that the newly defined PAS (Percentage of Affec... https://stilleners.shop/product-category/stabilizers/