Volume 42 Issue 3
Jun.  2022
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Article Navigation >  Chinese Journal of Space Science  > 2022  >  42(3): 476-484
LIU Yan, MENG Xiangguang, BAI Weihua, SUN Yueqiang, LIAO Mi, HAN Ying. Analysis of Beidou Radio Occultation Data from FY-3D Satellite (in Chinese). Chinese Journal of Space Science, 2022, 42(3): 476-484. DOI: 10.11728/cjss2022.03.210208019
Citation: LIU Yan, MENG Xiangguang, BAI Weihua, SUN Yueqiang, LIAO Mi, HAN Ying. Analysis of Beidou Radio Occultation Data from FY-3D Satellite (in Chinese). Chinese Journal of Space Science, 2022, 42(3): 476-484. DOI: 10.11728/cjss2022.03.210208019
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Analysis of Beidou Radio Occultation Data from FY-3D Satellite

doi: 10.11728/cjss2022.03.210208019
  • 1.

    China Meteorology Administration Earth System Modeling and Prediction Centre, Beijing 100081

  • 2.

    National Space Science Center, Chinese Academy of Sciences, Beijing 100190

  • 3.

    National Satellite Meteorology Center, China Meteorology Administration, Beijing 100081

  • 4.

    Department of Mathematics and Physics, Beijing Institute of Petrochemical Technology, Beijing 102617

  • Received Date: 2021-02-08
  • Accepted Date: 2021-10-08
  • Rev Recd Date: 2021-12-19
    • Available Online: 2022-05-26
    Abstract
  • Based on the Beidou radio occultation refractivity data of FY-3D satellite from January to March in 2018, the distribution characteristics of Beidou occultation, data accuracy and statistical characteristics of errors are studied. The Beidou Geostationary Orbit (GEO) occultation is distributed arc-shaped along the satellite orbit in the northern and southern polar regions, the Inclined Geo-Synchronous Orbit (IGSO) occultation forms one large and one small cavity respectively in the low latitude areas of the eastern and western hemispheres to form two cavities, and the Middle-Earth Orbit (MEO) occultation is distributed uniformly around the world. The accuracy of the Beidou occultion refractivity is within the range of 12~32 km in the core area. Compared with the ERA5 reanalysis data, the standard deviation of the average deviation is about 1.5%. In the range of height below 12 km and above 35 km, the standard deviation gradually increases from 1.5% to 6%. The deviation of GEO occultation over 35 km is slightly larger than that of IGSO and MEO occultation, but the standard deviation is smaller than that of these two types of occultation. The standard deviation of the descending occultation above 20 km is higher than that of the ascending occultation, but the area below 20 km is less than that of the ascending occultation. The standard deviation of the Beidou occultation is the smallest in high latitudes, followed by that in low latitudes and the largest in middle latitudes, especially in the middle and lower troposphere. The accuracy and error characteristics of the Beidou radio occultation data are consistent with the GPS radio occultation data, indicating that the Earth atmosphere occultation detection does not depend on the satellite navigation system.

     

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