Abstract: In order to evaluate the accuracy and stability of the sea surface wind speed product of the Cyclone Global Navigation Satellite System version 3.1, the paper analyzes the different versions and levels of data products and their generation processes, spatiotemporal resolution, applicability, etc. Based on the global tropical buoy array and the measured wind speed data provided by the National Hurricane Center in the United States, focus on evaluating the quality of the new version 3.1 and the current mainstream 2.1 version of level 2 wind speed products from various aspects such as effective data volume and different precision evaluation indicators. Experimental verification was conducted in typical regions of the Atlantic, Indian Ocean, and central and eastern tropical regions of the Pacific Ocean. Experimental results showed that compared to version 2.1, the effective data volume of medium and low wind speed data in each study area increased by an average of about 40% in version 3.1, and the root mean square error with the buoy reference data decreased by more than 43%; The root mean square error between high wind speed data and NHC hurricane reference data decreased by more than 27%, and wind speed data under different sea conditions showed higher correlation with the reference data. The results of this study can provide reference for users in accurately selecting CYGNSS data products for research and application in the field of sea surface wind field detection.

Key words: CYGNSS, sea surface wind speed, buoy array, hurricane monitoring, quality evaluation