| Citation: | YANG W T，XU T H，WANG N Z，et al. Influence of open water in retrieval of soil moisture by spaceborne GNSS-R[J]. Journal of Beijing University of Aeronautics and Astronautics，2023，49（7）：1779-1786 （in Chinese） doi: 10.13700/j.bh.1001-5965.2021.0479
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Soil moisture(SM) information can be obtained through the high spatial and temporal resolution spaceborne GNSS-R technology, however, open water will affect the accuracy of the retrieval results. To solve this problem, this paper proposes an improved method of removing open water. Prior to precisely removing the open water region based on the mask data, the simulated power must first be corrected to achieve the reflectivity.In order to verify the feasibility of the improved method, a one-year CYGNSS level 1 data was processed in two test areas with dense open water. The retrieval result was compared and analyzed with the soil moisture active passive (SMAP) level 3 soil moisture product. The root mean square error was 0.052 1 cm3/cm3, and the correlation was 0.654. Compared with the results before removing open water, it increased by 6.2% and 9%, respectively; Compared with the products officially released by CYGNSS, it increased by 32% and 24%. As a result, the retrieval results can be utilized to complement SMAP of SM measurements by providing highly time-resolved SM values.
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