Abstract
GNSS radio occultation (RO) plays an important role in ionospheric electron density inversion. As China's first seismo-electromagnetic satellite, China Seismo Electromagnetic Satellite (CSES) has collected the RO data with both GPS and BDS-2 satellites since March 2018. We analyzed the data quality of CSES GNSS occultation receiver (GOR) with almost one year of data in terms of signal-to-noise ratio, the cubic difference between epochs and the MP (multipath) combination. It was found that at the start of the signal acquisition, the GPS signal of GOR is affected to abnormal jumps on both P1 and P2 and large variations on P2, while the CSES BDS-2 GOR observation performed much better. To avoid potential contamination by these abnormal GPS observations in the CSES GOR ionospheric inversion, a quality control algorithm was promoted based on the MP2 combination. By removing the outliers using the quality control algorithm, the P2 observation integrity rate was 77.8% and 98.9% for GPS and BDS, respectively, and the abnormal values in the electron density profile can be detected and removed in the RO inversion efficiently. Then the comparison of F2 peak density and peak height was performed with respect to COSMIC for the whole experimental period with four different space–time matching criteria. The results of CSES GPS and BDS-2 suggested a significant correlation with that of COSMIC.
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Data availability
The COSMIC Radio Occultation data can be downloaded from https://cdaac-www.cosmic.ucar.edu/. The CSES Radio Occultation data can be obtained from http://www.leos.ac.cn and email author Shengfeng Gu.
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Acknowledgements
COSMIC Radio Occultation data can be downloaded from https://cdaac-www.cosmic.ucar.edu/, CSES Radio Occultation data can be downloaded from http://www.leos.ac.cn. The authors express their thanks. This research has been supported by the National Key R&D Program of China (grant no. 2018YFC1503502), the National Natural Science Foundation of China (No. 42104029), the China Postdoctoral Science Foundation (No. 2021M692975) and the Specialized Research Fund for Key Laboratory of Earth and Planetary Physics (No. DQXX2021-11).
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Gu, S., Gan, C., Qing, Y. et al. Statistical study on the CSES radio occultation data and its quality control in electron density inversion. GPS Solut 26, 95 (2022). https://doi.org/10.1007/s10291-022-01282-8
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DOI: https://doi.org/10.1007/s10291-022-01282-8