Part of West Bengal, an eastern state of India, was severely affected by a super cyclone Amphan (or Umpun) on May 20, 2020, during 14:30 to 11:00 h IST with a wind speed of 155–160 km/hr and heavy rainfall. During the most intense event, Global Navigation Satellite System (GNSS) data were collected using a compact GNSS module from a location situated extremely close to the cyclone eye path. Severe fluctuation of satellite signal strength for GPS, Galileo, and Beidou signals was observed during the time in the proximity of the cyclone eye. The signal strength fluctuations caused loss of lock for the signals at the receiver resulting in a low number of used satellites and degraded position solution quality. This manuscript presents the findings which were not reported earlier. The results would be useful for understanding the effects of such events, especially for the disaster management efforts during such events in the cases where GNSS is used.

印度东部邦西孟加拉邦的部分地区受到超级气旋Amphan（或Umpun) 2020 年 5 月 20 日，IST 时间 14:30 至 11:00 时，风速为 155-160 公里/小时，并有强降雨。在最激烈的事件中，全球导航卫星系统 (GNSS) 数据是使用紧凑型 GNSS 模块从非常靠近气旋风眼路径的位置收集的。在气旋眼附近的时间里，观测到 GPS、伽利略和北斗信号的卫星信号强度剧烈波动。信号强度波动导致接收器处的信号失锁，导致使用的卫星数量减少和定位解算质量下降。这份手稿展示了之前没有报道过的发现。结果将有助于了解此类事件的影响，特别是对于在使用 GNSS 的情况下此类事件期间的灾害管理工作。