QX-1 GNOS M is the first small commercial Global Navigation Satellite System(GNSS)occultation sounder to achieve on-orbit compatibility with BeiDou,GPS,and Galileo systems.On 14 Oc-tober 2021,at 18:51 LT,the Meteorological Satellite-1(QX-1)was launched and entered orbit.Since its launch,this satellite has collected a large amount of observational data.This paper provides a detailed introduction to the composition of QX-1 GNOS M and conducts a statistical analysis of the occultation events and their global distribution on 17 August 2022.By comparing the occultation data from 17 Au-gust to 3 September with the NCEP reanalysis model,the detection penetration depth and refractivity accuracy of QX-1 occultation events were evaluated,and the reliability and consistency of the Galileo oc-cultation data were tested.Preliminary analysis results show that after achieving three-system compati-bility,the number of occultation events detected by QX-1 GNOS M increased by approximately 1.5 times compared to using only the GPS system.This result further confirms that the occultation data provided by different GNSS systems are consistent in accuracy.Additionally,the study indicates that,in a multi-system compatibility context,QX-1 GNOS M can provide richer and more accurate meteorologi-cal and atmospheric data.
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