QX-1 GNOS M掩星数据质量分析

QX-1 GNOS M Radio Occultation Data Performance Analysis

QX-1 GNOS M是首台在轨实现北斗、GPS和Galileo三系统兼容的小型商业化全球导航卫星掩星探测仪. 2021年10月14日18:51 LT,气象一号(QX-1)卫星发射并入轨.自发射以来,该卫星已收集大量观测数据.基于QX-1 GNOS M的结构组成及性能,统计分析了2022年8月17日全天的掩星事件及其全球分布情况.通过将8月17日至9月3日的掩星数据与NCEP再分析模式对比,评估QX-1掩星事件的探测穿透深度和折射率精度,同时检验Galileo掩星数据的可靠性和一致性.初步分析结果表明, QX-1 GNOS M在实现三系统兼容后,掩星事件数量相较于仅使用GPS系统的情况增加了约1.5倍.这一结果进一步证明,不同全球导航卫星系统(GNSS)所提供的掩星数据在精度上具有一致性.此外研究显示,在多系统兼容的背景下, QX-1 GNOS M能够提供更为丰富和精确的气象数据.

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.