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Chinese Journal of Space Science ›› 2019, Vol. 39 ›› Issue (1): 36-45.doi: 10.11728/cjss2019.01.036

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Beidou Navigation Satellite System Sounding of the Ionosphere from FY-3C GNOS:Preliminary Results

YANG Guanglin1,2,3,4, SUN Yueqiang1,4,5, BAI Weihua1,4,5, ZHANG Xiaoxin2,3, YANG Zhongdong3, ZHANG Peng3, TAN Guangyuan1,5   

  1. 1 National Space Science Center, Chinese Academy of Sciences, Beijing 100190;
    2 Key Laboratory of Space Weather, National Center for Space Weather, China Meteorological Administration, Beijing 100081;
    3 National Satellite Meteorological Center, Beijing 100081;
    4 University of Chinese Academy of Sciences, Beijing 100049;
    5 Beijing Key Laboratory of Space Environment Exploration, Beijing 100190
  • Received:2017-12-11 Revised:2018-05-28 Online:2019-01-15 Published:2019-01-30

Abstract:

The world's first dual-system compatible Global Navigation Satellite System (GNSS) Occultation Sounder (GNOS) for Beidou Navigation Satellite System (BDS) and Global Positioning System (GPS) was successfully launched into orbit with FY-3C satellite on 23 September 2013, and a large number of ionospheric BDS Radio Occultation (BDSRO) data have been collected. The ionospheric BDSRO products observed by FY-3C GNOS are introduced firstly, then the distribution of ionospheric Electron Density Profiles (EDPs) in October 2013 is analyzed. Finally, the precision of ionospheric BDSRO data obtained by FY-3C GNOS is verified through F2-layer peak electron density (NmF2) comparisons between BDSRO and ionosondes. The results show that the correlation coefficient ofNmF2 data between BDSRO and ionosondes is 0.96, the bias is 10.21% and the standard deviation is 19.61%, which is comparable with other international ionospheric occultation products based on GPS. The NmF2 precision of BDSRO has the following characteristics. Its precision at daytime is higher than that at nighttime, and its precision in summer is higher than that in equinox seasons, while the precision in winter is lowest. Moreover, its precision at mid-latitude region is higher than that at low-latitude region, and the precision at high-latitude region is lowest. The precision of BDS satellites on Inclined Geosynchronous Satellite Orbit (IGSO) is higher than that on Geosynchronous Orbit (GEO) and Medium Earth Orbit (MEO). The precision consistency of the ionospheric occultation product between BDS-FY-3C GNOS and other internationl occultation projects is of great significance for comprehensively utilizing the GNSS occultation observation data. With the continued deployment of FY-3 satellites and Beidou navigation satellites, GNOS can provide more ionospheric occultation data in the future, which will be helpful to the ionospheric research and space weather forecasting based on GNSS occultation observations.

Key words: Radio occultation, Global navigation satellite system occultation sounder, Beidou navigation satellite system, Ionosphere

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