| Citation: | ZHANG Y，WANG Y，ZHOU S H，et al. Analysis on feasibility of detecting water blooms in Taihu Lake with spaceborne GNSS-R[J]. Journal of Beijing University of Aeronautics and Astronautics，2024，50（3）：695-705 （in Chinese） doi: 10.13700/j.bh.1001-5965.2022.0298
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Spaceborne global navigation satellite system-reflectometry (GNSS-R) is a passive remote sensing technology with the advantages of high data revisit cycle, all-day coverage, all-weather services, and abundant signal sources. Based on this, the feasibility of detecting water blooms in the Taihu Lake by on-board GNSS-R is studied. Spaceborne GNSS-R can effectively detect the roughness of the reflective surface. By using coherent reflection to characterize the roughness of the reflective surface, the relationship between coherent reflection and cyanobacterial blooms in different wind speed ranges is studied. The US cyclone global navigation satellite system (CYGNSS) is used to track the reflected signals of the global positioning system and calculate the power ratio of the delay Doppler map (DDM) of the CYGNSS mirror reflection point using CYGNSS data from April to August 2020. The chlorophyll concentration in Taihu Lake is used as a reference, retrieved from the maximum characteristic peak height (MPH) algorithm of the imagery from the ocean and land colour instrument (OLCI) aboard on “Sentinel-3” satellite. The time-space linear matching is also conducted with wind speed products of the European Centre for Medium-Range Weather Forecasts (ECMWF). Data analysis shows that in the range of wind speed 1−2.5 m/s and with the chlorophyll concentration reaching more than 0.1 mg/L, coherent reflection tends to occur at the specular reflection point, and the correlation coefficient between the power ratio and the chlorophyll concentration is 0.84, which has a good correlation. Experimental results verify the feasibility of detecting the Taihu Lake water bloom using the power ratio and related features.
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