Volume 45 Issue 2
Apr.  2025
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Article Navigation >  Chinese Journal of Space Science  > 2025  >  45(2): 353-363 Open Access
HUANG Feixiong, XIA Junming, YIN Cong, SUN Yueqiang, BAI Weihua, ZHAI Xiaochun, XU Na, CHEN Lin, HU Xiuqing. Sensitivity Analysis on the Retrieval of Significant Wave Height Using Fengyun-3E GNSS-R (in Chinese). Chinese Journal of Space Science, 2025, 45(2): 353-363 doi: 10.11728/cjss2025.02.2024-0093
Citation: HUANG Feixiong, XIA Junming, YIN Cong, SUN Yueqiang, BAI Weihua, ZHAI Xiaochun, XU Na, CHEN Lin, HU Xiuqing. Sensitivity Analysis on the Retrieval of Significant Wave Height Using Fengyun-3E GNSS-R (in Chinese). Chinese Journal of Space Science, 2025, 45(2): 353-363 doi: 10.11728/cjss2025.02.2024-0093
shu

Sensitivity Analysis on the Retrieval of Significant Wave Height Using Fengyun-3E GNSS-R

doi: 10.11728/cjss2025.02.2024-0093 cstr: 32142.14.cjss.2024-0093
  • 1.

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

  • 2.

    National Satellite Meteorological Center, China Meteorological Administration, Beijing 100081

  • Received Date: 2024-07-29
  • Rev Recd Date: 2024-08-27
    • Available Online: 2024-09-29
    Abstract
  • The Global Navigation Satellite System Reflectometry (GNSS-R) is a new ocean remote sensing technique using L-band forward quasi-specular scattering navigation signals. After comparing the similarities and differences between GNSS-R and other microwave remote sensing techniques, two methods of retrieving Significant Wave Height (SWH) by GNSS-R are proposed: one is a direct method using the leading edge slope of the normalized delay waveform; the other is indirect based on the sea surface roughness measurement. The feasibility and sensitivity of the two methods are analyzed through theoretical model and actual measurements from Fengyun-3E data. The results show that due to the low ranging accuracy from GNSS signals bandwidth, the leading edge slope is almost insensitive to SWH, which cannot be used for retrieval; the sea surface roughness from GNSS-R can be used to retrieve SWH with an accuracy of about 0.5～0.55 m. Although it still has some limitations, it can be used as a good supplementary means to obtain SWH data. The results of this paper can also provide guidance for the design of future GNSS-R satellite missions.

     

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